Now have multiple lights.

2026-08-23 13:25:45 -04:00 · 2026-08-23 13:25:45 -04:00 · 1b7066757a
commit 1b7066757a
parent a1d2c7768d
63 changed files with 13886 additions and 17 deletions
--- a/12-direction-lights/src/main.cpp
+++ b/12-direction-lights/src/main.cpp
@ -24,19 +24,6 @@ struct Config {
  Shader shader;
  Shader lightShader;

-  Light light{
-    .position={1.2f, 1.0f, 2.0f},
-    .direction={-0.2f, -1.0f, -0.3f},
-    .ambient={0.2f, 0.2f, 0.2f},
-    .diffuse={0.8f, 0.8f, 0.8f},
-    .specular={1.0f, 1.0f, 1.0f},
-    .constant=1.0f,
-    .linear=0.09f,
-    .quadratic=0.032f,
-    .cutOff=12.5f,
-    .outerCutOff=17.5f,
-  };
-
  glm::vec3 cubePos{2.0f, 0.0f, 0.0f};
  Camera camera{.movementSpeed=2.0f};

@ -243,15 +230,15 @@ void draw_cube(size_t pos, Config& config, glm::mat4& projection, glm::mat4& vie
  glDrawArrays(GL_TRIANGLES, 0, 36);
 }

-void draw_light(Config& config, glm::mat4& projection, glm::mat4& view) {
+void draw_light(Config& config, Light& light, glm::mat4& projection, glm::mat4& view) {
  config.lightShader.use();

-  config.lightShader.applyLight(config.light);
+  config.lightShader.setVec3(light.diffuse);
  config.lightShader.setMat4("projection", projection);
  config.lightShader.setMat4("view", view);

  glm::mat4 model = glm::mat4(1.0f);
-  model = glm::translate(model, config.light.position);
+  model = glm::translate(model, light.position);
  model = glm::scale(model, glm::vec3(0.2f));
  config.lightShader.setMat4("model", model);

@ -276,7 +263,9 @@ void render(GLFWwindow* window, Config& config) {
  // fov, aspect, near plane, far plane
  projection = glm::perspective(glm::radians(config.camera.fov), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);

-  // draw_light(config, projection, view);
+  for(auto& light : config.light.positioned) {
+    draw_light(config, light, projection, view);
+  }

  for(size_t i = 0; i < CUBE_COUNT; i++) {
    draw_cube(i, config, projection, view);
--- a/13-multiple-lights/.gitignore
+++ b/13-multiple-lights/.gitignore
@ -0,0 +1,10 @@
+.*.sw*
+.DS_Store
+*.sqlite3
+*.sqlite3-wal
+*.sqlite3-shm
+debug
+coverage/
+.coverage
+builddir
+subprojects
--- a/13-multiple-lights/.vimrc_proj
+++ b/13-multiple-lights/.vimrc_proj
@ -0,0 +1 @@
+set makeprg=meson\ compile\ -C\ .
--- a/13-multiple-lights/KHR/khrplatform.h
+++ b/13-multiple-lights/KHR/khrplatform.h
@ -0,0 +1,311 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */
--- a/13-multiple-lights/LICENSE
+++ b/13-multiple-lights/LICENSE
@ -0,0 +1,16 @@
+MIT No Attribution
+
+Copyright <YEAR> <COPYRIGHT HOLDER>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify,
+merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- a/13-multiple-lights/Makefile
+++ b/13-multiple-lights/Makefile
@ -0,0 +1,30 @@
+all: build
+
+reset:
+	powershell -executionpolicy bypass .\scripts\reset_build.ps1
+
+build:
+	meson compile -j 4 -C builddir
+
+release_build:
+	meson --wipe builddir -Db_ndebug=true --buildtype release
+	meson compile -j 4 -C builddir
+
+debug_build:
+	meson setup --wipe builddir -Db_ndebug=true --buildtype debugoptimized
+	meson compile -j 4 -C builddir
+
+run: test
+	./builddir/hellogl.exe
+
+test: build
+	./builddir/fuc2it
+
+debug_test: build
+	gdb --nx -x .gdbinit --ex run --args builddir/fuc2it.exe
+
+debug_run: build
+	gdb --nx -x .gdbinit --batch --ex run --ex bt --ex q --args builddir/hellogl.exe
+
+clean:
+	meson compile --clean -C builddir
--- a/13-multiple-lights/assets/popcorn_model_a.glb
+++ b/13-multiple-lights/assets/popcorn_model_a.glb
--- a/13-multiple-lights/glad/glad.cpp
+++ b/13-multiple-lights/glad/glad.cpp
--- a/13-multiple-lights/glad/glad.h
+++ b/13-multiple-lights/glad/glad.h
--- a/13-multiple-lights/meson.build
+++ b/13-multiple-lights/meson.build
@ -0,0 +1,100 @@
+project('hellogl', 'cpp',
+  version: '0.1.0',
+  default_options: [
+    'cpp_std=c++23',
+    'cpp_args=-D_GLIBCXX_DEBUG=1 -D_GLIBCXX_DEBUG_PEDANTIC=1',
+  ])
+
+# use this for common options only for our executables
+cpp_args=[
+  '-Wno-unused-parameter',
+  '-Wno-unused-function',
+  '-Wno-unused-variable',
+  '-Wno-unused-but-set-variable',
+  '-Wno-deprecated-declarations',
+]
+link_args=[]
+# these are passed as override_defaults
+exe_defaults = [ 'warning_level=2' ]
+
+cc = meson.get_compiler('cpp')
+dependencies = []
+
+if build_machine.system() == 'windows'
+  add_global_link_arguments(
+    '-static-libgcc',
+    '-static-libstdc++',
+    '-static',
+    '-lstdc++exp',
+    language: 'cpp',
+  )
+
+  opengl32 = cc.find_library('opengl32', required: true)
+  winmm = cc.find_library('winmm', required: true)
+  gdi32 = cc.find_library('gdi32', required: true)
+
+  dependencies += [
+      opengl32, winmm, gdi32
+  ]
+  exe_defaults += ['werror=true']
+
+elif build_machine.system() == 'darwin'
+  add_global_link_arguments(
+    language: 'cpp',
+  )
+
+  opengl = dependency('OpenGL')
+  corefoundation = dependency('CoreFoundation')
+  carbon = dependency('Carbon')
+  cocoa = dependency('Cocoa')
+  iokit = dependency('IOKit')
+  corevideo = dependency('CoreVideo')
+
+  link_args += ['-ObjC']
+  exe_defaults += ['werror=false']
+  dependencies += [
+    opengl, corefoundation, carbon, cocoa, iokit, corevideo
+  ]
+endif
+
+glfw3 = subproject('glfw').get_variable('glfw_dep')
+fuc2 = subproject('fuc2').get_variable('fuc2_dep')
+fmt = subproject('fmt').get_variable('fmt_dep')
+glm = subproject('glm').get_variable('glm_dep')
+box2d = subproject('box2d').get_variable('box2d_dep')
+
+assimp = subproject('assimp').get_variable('assimp_dep')
+
+dependencies += [
+  glfw3, fuc2, fmt, glm, box2d, assimp
+]
+
+inc_dirs = ['src']
+
+sources = [
+  'glad/glad.cpp',
+  'src/dbc.cpp',
+  'src/stb_image.cpp',
+  'src/shader.cpp',
+  'src/physics.cpp',
+  'src/mesh.cpp',
+  'src/model.cpp',
+  'src/camera.cpp',
+]
+
+subdir('tests')
+
+executable('fuc2it', sources + fuc2_tests,
+  cpp_args: cpp_args,
+  link_args: link_args,
+  include_directories: inc_dirs,
+  override_options: exe_defaults,
+  dependencies: dependencies + [fuc2])
+
+executable('hellogl',
+  sources + [ 'src/main.cpp' ],
+  cpp_args: cpp_args,
+  include_directories: inc_dirs,
+  link_args: link_args,
+  override_options: exe_defaults,
+  dependencies: dependencies)
--- a/13-multiple-lights/resources/textures/awesomeface.png
+++ b/13-multiple-lights/resources/textures/awesomeface.png
--- a/13-multiple-lights/resources/textures/container.jpg
+++ b/13-multiple-lights/resources/textures/container.jpg
--- a/13-multiple-lights/resources/textures/container2.png
+++ b/13-multiple-lights/resources/textures/container2.png
--- a/13-multiple-lights/resources/textures/container2_specular.png
+++ b/13-multiple-lights/resources/textures/container2_specular.png
--- a/13-multiple-lights/resources/textures/popcorn.jpg
+++ b/13-multiple-lights/resources/textures/popcorn.jpg
--- a/13-multiple-lights/scripts/reset_build.ps1
+++ b/13-multiple-lights/scripts/reset_build.ps1
@ -0,0 +1,7 @@
+mv .\subprojects\packagecache .
+rm -recurse -force .\subprojects\,.\builddir\
+mkdir subprojects
+mv .\packagecache .\subprojects\
+mkdir builddir
+cp wraps\*.wrap subprojects\
+meson setup --default-library=static --prefer-static  builddir
--- a/13-multiple-lights/scripts/reset_build.sh
+++ b/13-multiple-lights/scripts/reset_build.sh
@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+mv -f ./subprojects/packagecache .
+rm -rf subprojects builddir
+mkdir subprojects
+mv -f packagecache ./subprojects/ && true
+mkdir builddir
+cp wraps/*.wrap subprojects/
+# on OSX you can't do this with static
+meson setup --default-library=static --prefer-static  builddir
--- a/13-multiple-lights/scripts/setup.ps1
+++ b/13-multiple-lights/scripts/setup.ps1
@ -0,0 +1,4 @@
+mkdir builddir
+mkdir subprojects
+cp wraps/*.wrap subprojects
+meson setup -Ddefault_library=static builddir
--- a/13-multiple-lights/scripts/setup.sh
+++ b/13-multiple-lights/scripts/setup.sh
@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -ex
+
+mkdir subprojects
+mkdir builddir
+cp wraps/*.wrap subprojects/
+meson setup builddir
--- a/13-multiple-lights/scripts/watch_build.sh
+++ b/13-multiple-lights/scripts/watch_build.sh
@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -e
+
+fswatch -o *.cpp | while read num
+do echo ">>>>>>>>>>>>>>>>>>>>>> `date`"
+  if meson compile -C builddir
+  then
+    ./builddir/sfmldemo
+  else
+    echo "^^^^^^^^^^^^^^^^^^^^^ ERROR `date`"
+  fi
+done
--- a/13-multiple-lights/scripts/windows_setup.ps1
+++ b/13-multiple-lights/scripts/windows_setup.ps1
@ -0,0 +1,255 @@
+function Test-WinUtilPackageManager {
+    <#
+
+    .SYNOPSIS
+        Checks if Winget and/or Choco are installed
+
+    .PARAMETER winget
+        Check if Winget is installed
+
+    .PARAMETER choco
+        Check if Chocolatey is installed
+
+    #>
+
+    Param(
+        [System.Management.Automation.SwitchParameter]$winget,
+        [System.Management.Automation.SwitchParameter]$choco
+    )
+
+    $status = "not-installed"
+
+    if ($winget) {
+        # Check if Winget is available while getting it's Version if it's available
+        $wingetExists = $true
+        try {
+            $wingetVersionFull = winget --version
+        } catch [System.Management.Automation.CommandNotFoundException], [System.Management.Automation.ApplicationFailedException] {
+            Write-Warning "Winget was not found due to un-availablity reasons"
+            $wingetExists = $false
+        } catch {
+            Write-Warning "Winget was not found due to un-known reasons, The Stack Trace is:`n$($psitem.Exception.StackTrace)"
+            $wingetExists = $false
+	}
+
+        # If Winget is available, Parse it's Version and give proper information to Terminal Output.
+	# If it isn't available, the return of this funtion will be "not-installed", indicating that
+        # Winget isn't installed/available on The System.
+	if ($wingetExists) {
+            # Check if Preview Version
+            if ($wingetVersionFull.Contains("-preview")) {
+                $wingetVersion = $wingetVersionFull.Trim("-preview")
+                $wingetPreview = $true
+            } else {
+                $wingetVersion = $wingetVersionFull
+                $wingetPreview = $false
+            }
+
+            # Check if Winget's Version is too old.
+            $wingetCurrentVersion = [System.Version]::Parse($wingetVersion.Trim('v'))
+            # Grabs the latest release of Winget from the Github API for version check process.
+            $response = Invoke-RestMethod -Uri "https://api.github.com/repos/microsoft/Winget-cli/releases/latest" -Method Get -ErrorAction Stop
+            $wingetLatestVersion = [System.Version]::Parse(($response.tag_name).Trim('v')) #Stores version number of latest release.
+            $wingetOutdated = $wingetCurrentVersion -lt $wingetLatestVersion
+            Write-Host "===========================================" -ForegroundColor Green
+            Write-Host "---        Winget is installed          ---" -ForegroundColor Green
+            Write-Host "===========================================" -ForegroundColor Green
+            Write-Host "Version: $wingetVersionFull" -ForegroundColor White
+
+            if (!$wingetPreview) {
+                Write-Host "    - Winget is a release version." -ForegroundColor Green
+            } else {
+                Write-Host "    - Winget is a preview version. Unexpected problems may occur." -ForegroundColor Yellow
+            }
+
+            if (!$wingetOutdated) {
+                Write-Host "    - Winget is Up to Date" -ForegroundColor Green
+                $status = "installed"
+            }
+            else {
+                Write-Host "    - Winget is Out of Date" -ForegroundColor Red
+                $status = "outdated"
+            }
+        } else {
+            Write-Host "===========================================" -ForegroundColor Red
+            Write-Host "---      Winget is not installed        ---" -ForegroundColor Red
+            Write-Host "===========================================" -ForegroundColor Red
+            $status = "not-installed"
+        }
+    }
+
+    if ($choco) {
+        if ((Get-Command -Name choco -ErrorAction Ignore) -and ($chocoVersion = (Get-Item "$env:ChocolateyInstall\choco.exe" -ErrorAction Ignore).VersionInfo.ProductVersion)) {
+            Write-Host "===========================================" -ForegroundColor Green
+            Write-Host "---      Chocolatey is installed        ---" -ForegroundColor Green
+            Write-Host "===========================================" -ForegroundColor Green
+            Write-Host "Version: v$chocoVersion" -ForegroundColor White
+            $status = "installed"
+        } else {
+            Write-Host "===========================================" -ForegroundColor Red
+            Write-Host "---    Chocolatey is not installed      ---" -ForegroundColor Red
+            Write-Host "===========================================" -ForegroundColor Red
+            $status = "not-installed"
+        }
+    }
+
+    return $status
+}
+
+function Get-WinUtilWingetPrerequisites {
+    <#
+    .SYNOPSIS
+        Downloads the Winget Prereqs.
+    .DESCRIPTION
+        Downloads Prereqs for Winget. Version numbers are coded as variables and can be updated as uncommonly as Microsoft updates the prereqs.
+    #>
+
+    # I don't know of a way to detect the prereqs automatically, so if someone has a better way of defining these, that would be great.
+    # Microsoft.VCLibs version rarely changes, but for future compatibility I made it a variable.
+    $versionVCLibs = "14.00"
+    $fileVCLibs = "https://aka.ms/Microsoft.VCLibs.x64.${versionVCLibs}.Desktop.appx"
+    # Write-Host "$fileVCLibs"
+    # Microsoft.UI.Xaml version changed recently, so I made the version numbers variables.
+    $versionUIXamlMinor = "2.8"
+    $versionUIXamlPatch = "2.8.6"
+    $fileUIXaml = "https://github.com/microsoft/microsoft-ui-xaml/releases/download/v${versionUIXamlPatch}/Microsoft.UI.Xaml.${versionUIXamlMinor}.x64.appx"
+    # Write-Host "$fileUIXaml"
+
+    Try{
+        Write-Host "Downloading Microsoft.VCLibs Dependency..."
+        Invoke-WebRequest -Uri $fileVCLibs -OutFile $ENV:TEMP\Microsoft.VCLibs.x64.Desktop.appx
+        Write-Host "Downloading Microsoft.UI.Xaml Dependency...`n"
+        Invoke-WebRequest -Uri $fileUIXaml -OutFile $ENV:TEMP\Microsoft.UI.Xaml.x64.appx
+    }
+    Catch{
+        throw [WingetFailedInstall]::new('Failed to install prerequsites')
+    }
+}
+
+function Get-WinUtilWingetLatest {
+    <#
+    .SYNOPSIS
+        Uses GitHub API to check for the latest release of Winget.
+    .DESCRIPTION
+        This function grabs the latest version of Winget and returns the download path to Install-WinUtilWinget for installation.
+    #>
+    # Invoke-WebRequest is notoriously slow when the byte progress is displayed. The following lines disable the progress bar and reset them at the end of the function
+    $PreviousProgressPreference = $ProgressPreference
+    $ProgressPreference = "silentlyContinue"
+    Try{
+        # Grabs the latest release of Winget from the Github API for the install process.
+        $response = Invoke-RestMethod -Uri "https://api.github.com/repos/microsoft/Winget-cli/releases/latest" -Method Get -ErrorAction Stop
+        $latestVersion = $response.tag_name #Stores version number of latest release.
+        $licenseWingetUrl = $response.assets.browser_download_url | Where-Object {$_ -like "*License1.xml"} #Index value for License file.
+        Write-Host "Latest Version:`t$($latestVersion)`n"
+        Write-Host "Downloading..."
+        $assetUrl = $response.assets.browser_download_url | Where-Object {$_ -like "*Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle"}
+        Invoke-WebRequest -Uri $licenseWingetUrl -OutFile $ENV:TEMP\License1.xml
+        # The only pain is that the msixbundle for winget-cli is 246MB. In some situations this can take a bit, with slower connections.
+        Invoke-WebRequest -Uri $assetUrl -OutFile $ENV:TEMP\Microsoft.DesktopAppInstaller.msixbundle
+    }
+    Catch{
+        throw [WingetFailedInstall]::new('Failed to get latest Winget release and license')
+    }
+    $ProgressPreference = $PreviousProgressPreference
+}
+
+function Install-WinUtilWinget {
+    <#
+
+    .SYNOPSIS
+        Installs Winget if it is not already installed.
+
+    .DESCRIPTION
+        This function will download the latest version of Winget and install it. If Winget is already installed, it will do nothing.
+    #>
+    $isWingetInstalled = Test-WinUtilPackageManager -winget
+
+    Try {
+        if ($isWingetInstalled -eq "installed") {
+            Write-Host "`nWinget is already installed.`r" -ForegroundColor Green
+            return
+        } elseif ($isWingetInstalled -eq "outdated") {
+            Write-Host "`nWinget is Outdated. Continuing with install.`r" -ForegroundColor Yellow
+        } else {
+            Write-Host "`nWinget is not Installed. Continuing with install.`r" -ForegroundColor Red
+        }
+
+        # Gets the computer's information
+        if ($null -eq $sync.ComputerInfo){
+            $ComputerInfo = Get-ComputerInfo -ErrorAction Stop
+        } else {
+            $ComputerInfo = $sync.ComputerInfo
+        }
+
+        if (($ComputerInfo.WindowsVersion) -lt "1809") {
+            # Checks if Windows Version is too old for Winget
+            Write-Host "Winget is not supported on this version of Windows (Pre-1809)" -ForegroundColor Red
+            return
+        }
+
+        # Install Winget via GitHub method.
+        # Used part of my own script with some modification: ruxunderscore/windows-initialization
+        Write-Host "Downloading Winget Prerequsites`n"
+        Get-WinUtilWingetPrerequisites
+        Write-Host "Downloading Winget and License File`r"
+        Get-WinUtilWingetLatest
+        Write-Host "Installing Winget w/ Prerequsites`r"
+        Add-AppxProvisionedPackage -Online -PackagePath $ENV:TEMP\Microsoft.DesktopAppInstaller.msixbundle -DependencyPackagePath $ENV:TEMP\Microsoft.VCLibs.x64.Desktop.appx, $ENV:TEMP\Microsoft.UI.Xaml.x64.appx -LicensePath $ENV:TEMP\License1.xml
+		Write-Host "Manually adding Winget Sources, from Winget CDN."
+		Add-AppxPackage -Path https://cdn.winget.microsoft.com/cache/source.msix #Seems some installs of Winget don't add the repo source, this should makes sure that it's installed every time.
+        Write-Host "Winget Installed" -ForegroundColor Green
+        Write-Host "Enabling NuGet and Module..."
+        Install-PackageProvider -Name NuGet -Force
+        Install-Module -Name Microsoft.WinGet.Client -Force
+        # Winget only needs a refresh of the environment variables to be used.
+        Write-Output "Refreshing Environment Variables...`n"
+        $ENV:PATH = [System.Environment]::GetEnvironmentVariable("Path", "Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path", "User")
+    } Catch {
+        Write-Host "Failure detected while installing via GitHub method. Continuing with Chocolatey method as fallback." -ForegroundColor Red
+        # In case install fails via GitHub method.
+        Try {
+        # Install Choco if not already present
+        Install-WinUtilChoco
+        Start-Process -Verb runas -FilePath powershell.exe -ArgumentList "choco install winget-cli"
+        Write-Host "Winget Installed" -ForegroundColor Green
+        Write-Output "Refreshing Environment Variables...`n"
+        $ENV:PATH = [System.Environment]::GetEnvironmentVariable("Path", "Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path", "User")
+        } Catch {
+            throw [WingetFailedInstall]::new('Failed to install!')
+        }
+    }
+}
+
+
+$isAdmin = [System.Security.Principal.WindowsPrincipal]::new(
+    [System.Security.Principal.WindowsIdentity]::GetCurrent()).
+        IsInRole('Administrators')
+
+if(-not $isAdmin) {
+  $params = @{
+      FilePath     = 'powershell' # or pwsh if Core
+      Verb         = 'RunAs'
+      ArgumentList = @(
+          '-ExecutionPolicy ByPass'
+          '-File "{0}"' -f $PSCommandPath
+      )
+  }
+
+  Start-Process -Wait @params
+  Write-Host "Admin stuff done..."
+} else {
+  Write-Host "In Admin stuff..."
+  Install-WinUtilWinget
+  return
+}
+
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','chocolatey'
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','Git.Git'
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','Microsoft.WindowsTerminal'
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','Python.Python.3.12'
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','AntibodySoftware.WizFile'
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','Kitware.CMake'
+Start-Process -NoNewWindow -Wait winget -ArgumentList 'install','Microsoft.VCRedist.2015+.x64'
+
+Start-Process -Verb RunAs -Wait powershell -argumentlist 'C:\ProgramData\chocolatey\bin\choco.exe','install','geany','geany-plugins','winlibs','conan','meson'
--- a/13-multiple-lights/shaders/08-frag.glsl
+++ b/13-multiple-lights/shaders/08-frag.glsl
@ -0,0 +1,43 @@
+#version 330 core
+struct Material {
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+  float shininess;
+};
+
+struct Light {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+uniform Light light;
+
+uniform Material material;
+out vec4 FragColor;
+in vec3 FragPos;
+in vec3 Normal;
+
+uniform vec3 viewPos;
+
+void main()
+{
+  vec3 ambient = light.ambient * material.ambient;
+
+  vec3 norm = normalize(Normal);
+  vec3 lightDir = normalize(light.position - FragPos);
+  float diff = max(dot(norm, lightDir), 0.0);
+  vec3 diffuse = light.diffuse * (diff * material.diffuse);
+
+  vec3 viewDir = normalize(viewPos - FragPos);
+  vec3 reflectDir = reflect(-lightDir, norm);
+
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+  vec3 specular = light.specular * (material.specular * spec);
+
+  vec3 result = ambient + diffuse + specular;
+
+  FragColor = vec4(result, 1.0);
+}
--- a/13-multiple-lights/shaders/08-lightsource.frag.glsl
+++ b/13-multiple-lights/shaders/08-lightsource.frag.glsl
@ -0,0 +1,16 @@
+#version 330 core
+out vec4 FragColor;
+
+struct Light {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+uniform Light light;
+
+void main()
+{
+    FragColor = vec4(light.diffuse, 1.0); // set all 4 vector values to 1.0
+}
--- a/13-multiple-lights/shaders/08-vert.glsl
+++ b/13-multiple-lights/shaders/08-vert.glsl
@ -0,0 +1,17 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+
+out vec3 FragPos;
+out vec3 Normal;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;
+}
--- a/13-multiple-lights/shaders/11-frag.glsl
+++ b/13-multiple-lights/shaders/11-frag.glsl
@ -0,0 +1,46 @@
+#version 330 core
+struct Material {
+  sampler2D diffuse;
+  sampler2D specular;
+  float shininess;
+};
+
+struct Light {
+  vec3 position;
+  vec3 diffuse;
+  vec3 specular;
+  vec3 ambient;
+};
+
+out vec4 FragColor;
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform Light light;
+uniform Material material;
+
+void main()
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+
+  vec3 ambient = light.ambient * mat_tex;
+
+  vec3 norm = normalize(Normal);
+  vec3 lightDir = normalize(light.position - FragPos);
+  float diff = max(dot(norm, lightDir), 0.0);
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+
+  vec3 viewDir = normalize(viewPos - FragPos);
+  vec3 reflectDir = reflect(-lightDir, norm);
+
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  vec3 specular = light.specular * spec * spec_tex;
+
+  vec3 result = ambient + diffuse + specular;
+
+  FragColor = vec4(result, 1.0);
+}
--- a/13-multiple-lights/shaders/11-lightsource.frag.glsl
+++ b/13-multiple-lights/shaders/11-lightsource.frag.glsl
@ -0,0 +1,16 @@
+#version 330 core
+out vec4 FragColor;
+
+struct Light {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+uniform Light light;
+
+void main()
+{
+    FragColor = vec4(light.diffuse, 1.0); // set all 4 vector values to 1.0
+}
--- a/13-multiple-lights/shaders/11-vert.glsl
+++ b/13-multiple-lights/shaders/11-vert.glsl
@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+out vec3 FragPos;
+out vec3 Normal;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;
+    TexCoords = aTexCoords;
+}
--- a/13-multiple-lights/shaders/12-frag.glsl
+++ b/13-multiple-lights/shaders/12-frag.glsl
@ -0,0 +1,67 @@
+#version 330 core
+struct Material {
+  sampler2D diffuse;
+  sampler2D specular;
+  float shininess;
+};
+
+struct Light {
+  vec3 direction;
+  vec3 position;
+  vec3 diffuse;
+  vec3 specular;
+  vec3 ambient;
+
+  float constant;
+  float linear;
+  float quadratic;
+  float cutOff;
+  float outerCutOff;
+};
+
+out vec4 FragColor;
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform Light light;
+uniform Material material;
+
+void main()
+{
+  vec3 lightDir = normalize(light.position - FragPos);
+
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+  vec3 ambient = light.ambient * mat_tex;
+
+  vec3 norm = normalize(Normal);
+  float diff = max(dot(norm, lightDir), 0.0);
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+
+  vec3 viewDir = normalize(viewPos - FragPos);
+  vec3 reflectDir = reflect(-lightDir, norm);
+
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  vec3 specular = light.specular * spec * spec_tex;
+
+  // splotlight
+  float theta = dot(lightDir, normalize(-light.direction));
+  float epsilon = light.cutOff - light.outerCutOff;
+  float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
+  diffuse *= intensity;
+  specular *= intensity;
+
+  // determine attenuation based on light distance
+  float distance = length(light.position - FragPos);
+  float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+
+  ambient *= attenuation;
+  diffuse *= attenuation;
+  specular *= attenuation;
+
+  vec3 result = ambient + diffuse + specular;
+  FragColor = vec4(result, 1.0);
+}
--- a/13-multiple-lights/shaders/12-lightsource.frag.glsl
+++ b/13-multiple-lights/shaders/12-lightsource.frag.glsl
@ -0,0 +1,16 @@
+#version 330 core
+out vec4 FragColor;
+
+struct Light {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+uniform Light light;
+
+void main()
+{
+    FragColor = vec4(light.diffuse, 1.0); // set all 4 vector values to 1.0
+}
--- a/13-multiple-lights/shaders/12-vert.glsl
+++ b/13-multiple-lights/shaders/12-vert.glsl
@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+out vec3 FragPos;
+out vec3 Normal;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;
+    TexCoords = aTexCoords;
+}
--- a/13-multiple-lights/shaders/13-frag.glsl
+++ b/13-multiple-lights/shaders/13-frag.glsl
@ -0,0 +1,150 @@
+#version 330 core
+struct Material {
+  sampler2D diffuse;
+  sampler2D specular;
+  float shininess;
+};
+
+out vec4 FragColor;
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform Material material;
+
+struct DirLight {
+  vec3 direction;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+struct PointLight {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+  float constant;
+  float linear;
+  float quadratic;
+};
+
+struct SpotLight {
+  vec3 direction;
+  vec3 position;
+  vec3 diffuse;
+  vec3 specular;
+  vec3 ambient;
+
+  float constant;
+  float linear;
+  float quadratic;
+  float cutOff;
+  float outerCutOff;
+};
+
+
+#define NR_POINT_LIGHTS 4
+uniform int pointLightCount;
+uniform PointLight pointLights[NR_POINT_LIGHTS];
+uniform DirLight dirLight;
+uniform SpotLight spotLight;
+
+vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir)
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+
+  vec3 lightDir = normalize(-light.direction);
+  // diffuse shading
+  float diff = max(dot(normal, lightDir), 0.0);
+
+  // specular shading
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  vec3 ambient = light.ambient * mat_tex;
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+  vec3 specular = light.specular * spec * spec_tex;
+
+  return ambient + diffuse + specular;
+}
+
+vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+  vec3 lightDir = normalize(light.position - fragPos);
+
+  // diffuse shading
+  float diff = max(dot(normal, lightDir), 0.0);
+
+  // specular shading
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  // attenuation
+  float distance = length(light.position - fragPos);
+  float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+
+  vec3 ambient = light.ambient * mat_tex;
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+  vec3 specular = light.specular * spec * spec_tex;
+
+  ambient *= attenuation;
+  diffuse *= attenuation;
+  specular *= attenuation;
+
+  return ambient + diffuse + specular;
+}
+
+vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+  vec3 lightDir = normalize(light.position - fragPos);
+
+  // diffuse shading
+  float diff = max(dot(normal, lightDir), 0.0);
+
+  // specular shading
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  // attenuation
+  float distance = length(light.position - fragPos);
+  float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+
+  vec3 ambient = light.ambient * mat_tex;
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+  vec3 specular = light.specular * spec * spec_tex;
+
+  float theta = dot(lightDir, normalize(-light.direction));
+  float epsilon = light.cutOff - light.outerCutOff;
+  float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
+  diffuse *= intensity;
+  specular *= intensity;
+
+  ambient *= attenuation;
+  diffuse *= attenuation;
+  specular *= attenuation;
+
+  return ambient + diffuse + specular;
+}
+
+void main()
+{
+  vec3 norm = normalize(Normal);
+  vec3 viewDir = normalize(viewPos - FragPos);
+
+  vec3 result = CalcDirLight(dirLight, norm, viewDir);
+
+  for(int i = 0; i < pointLightCount; i++) {
+    result += CalcPointLight(pointLights[i], norm, FragPos, viewDir);
+  }
+
+  result += CalcSpotLight(spotLight, norm, FragPos, viewDir);
+
+  FragColor = vec4(result, 1.0);
+}
--- a/13-multiple-lights/shaders/13-lightsource.frag.glsl
+++ b/13-multiple-lights/shaders/13-lightsource.frag.glsl
@ -0,0 +1,9 @@
+#version 330 core
+out vec4 FragColor;
+
+uniform vec3 diffuse;
+
+void main()
+{
+    FragColor = vec4(diffuse, 1.0); // set all 4 vector values to 1.0
+}
--- a/13-multiple-lights/shaders/13-vert.glsl
+++ b/13-multiple-lights/shaders/13-vert.glsl
@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+out vec3 FragPos;
+out vec3 Normal;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;
+    TexCoords = aTexCoords;
+}
--- a/13-multiple-lights/shaders/3.3.shader.fs
+++ b/13-multiple-lights/shaders/3.3.shader.fs
@ -0,0 +1,8 @@
+#version 330 core
+out vec4 FragColor;
+in vec3 ourColor;
+
+void main()
+{
+    FragColor = vec4(ourColor, 1.0);
+}
--- a/13-multiple-lights/shaders/3.3.shader.vs
+++ b/13-multiple-lights/shaders/3.3.shader.vs
@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 aPos; // the position variable has attribute position 0
+layout (location = 1) in vec3 aColor;
+
+out vec3 ourColor;
+
+void main()
+{
+    gl_Position = vec4(aPos, 1.0); // see how we directly give a vec3 to vec4's constructor
+    ourColor = aColor;
+}
--- a/13-multiple-lights/shaders/4.2.texture.fs
+++ b/13-multiple-lights/shaders/4.2.texture.fs
@ -0,0 +1,11 @@
+#version 330 core
+
+out vec4 FragColor;
+in vec2 TexCoord;
+
+uniform sampler2D texture1;
+
+void main()
+{
+  FragColor = texture(texture1, TexCoord);
+}
--- a/13-multiple-lights/shaders/4.2.texture.vs
+++ b/13-multiple-lights/shaders/4.2.texture.vs
@ -0,0 +1,15 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec2 aTexCoord;
+
+out vec2 TexCoord;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    TexCoord = vec2(aTexCoord.x, aTexCoord.y);
+}
--- a/13-multiple-lights/src/camera.cpp
+++ b/13-multiple-lights/src/camera.cpp
@ -0,0 +1,63 @@
+#include "camera.hpp"
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+glm::mat4 Camera::lookAt() {
+  return glm::lookAt(pos, pos + front, up);
+}
+
+void Camera::forward() {
+  pos += speed * front;
+}
+
+void Camera::back() {
+  pos -= speed * front;
+}
+
+void Camera::left() {
+  pos -= glm::normalize(glm::cross(front, up)) * speed;
+}
+
+void Camera::right() {
+  pos += glm::normalize(glm::cross(front, up)) * speed;
+}
+
+void Camera::update(float deltaTime) {
+  speed = movementSpeed * deltaTime;
+}
+
+void Camera::mouse_move(double xpos, double ypos) {
+  if(firstMouse) {
+    lastX = xpos;
+    lastY = ypos;
+    firstMouse = false;
+  }
+
+  float xoffset = xpos - lastX;
+  float yoffset = lastY - ypos;
+  lastX = xpos;
+  lastY = ypos;
+
+  const float sensitivity = 0.1f;
+  xoffset *= sensitivity;
+  yoffset *= sensitivity;
+
+  yaw += xoffset;
+  pitch += yoffset;
+
+  if(pitch > 89.0f) pitch = 89.0f;
+  if(pitch < -89.0f) pitch = -89.0f;
+
+  direction.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
+  direction.y = sin(glm::radians(pitch));
+  direction.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
+
+  front = glm::normalize(direction);
+}
+
+void Camera::mouse_scroll(double xoffset, double yoffset) {
+  fov -= (float)yoffset;
+
+  if(fov < 1.0f) fov = 1.0f;
+  if(fov > 90.0f) fov = 90.0f;
+}
--- a/13-multiple-lights/src/camera.hpp
+++ b/13-multiple-lights/src/camera.hpp
@ -0,0 +1,27 @@
+#pragma once
+#include <glm/glm.hpp>
+
+struct Camera {
+  glm::vec3 pos = glm::vec3(0.0f, 0.0f, 3.0f);
+  glm::vec3 front = glm::vec3(0.0f, 0.0f, -1.0f);
+  glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f);
+  glm::vec3 direction = glm::vec3(0.0f, 0.0f, 0.0f);
+  float movementSpeed = 20.0f;
+
+  float pitch = 0.0f;
+  float yaw = -90.0f;
+  float speed = 0.05f;
+  float lastX = 400;
+  float lastY = 300;
+  float fov = 45.0f;
+  bool firstMouse = true;
+
+  glm::mat4 lookAt();
+  void forward();
+  void back();
+  void left();
+  void right();
+  void update(float deltaTime);
+  void mouse_move(double xpos, double ypos);
+  void mouse_scroll(double xoffset, double yoffset);
+};
--- a/13-multiple-lights/src/data.hpp
+++ b/13-multiple-lights/src/data.hpp
@ -0,0 +1,63 @@
+#pragma once
+#include <glm/glm.hpp>
+
+#define CUBE_COUNT 10
+
+float vertices[] = {
+  // positions          // normals           // texture coords
+  -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  0.0f,
+   0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  0.0f,
+   0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  1.0f,
+   0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  1.0f,
+  -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  1.0f,
+  -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  0.0f,
+
+  -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  0.0f,
+   0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  0.0f,
+   0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  1.0f,
+   0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  1.0f,
+  -0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  1.0f,
+  -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  0.0f,
+
+  -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  0.0f,
+  -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  1.0f,
+  -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
+  -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
+  -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  0.0f,
+  -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  0.0f,
+
+   0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  0.0f,
+   0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  1.0f,
+   0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
+   0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  1.0f,
+   0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  0.0f,
+   0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  0.0f,
+
+  -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  1.0f,
+   0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  1.0f,
+   0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  0.0f,
+   0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  0.0f,
+  -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  0.0f,
+  -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  1.0f,
+
+  -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  1.0f,
+   0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  1.0f,
+   0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  0.0f,
+   0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  0.0f,
+  -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  0.0f,
+  -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  1.0f
+};
+
+// positions all containers
+glm::vec3 cube_positions[] = {
+    glm::vec3( 0.0f,  0.0f,  0.0f),
+    glm::vec3( 2.0f,  5.0f, -15.0f),
+    glm::vec3(-1.5f, -2.2f, -2.5f),
+    glm::vec3(-3.8f, -2.0f, -12.3f),
+    glm::vec3( 2.4f, -0.4f, -3.5f),
+    glm::vec3(-1.7f,  3.0f, -7.5f),
+    glm::vec3( 1.3f, -2.0f, -2.5f),
+    glm::vec3( 1.5f,  2.0f, -2.5f),
+    glm::vec3( 1.5f,  0.2f, -1.5f),
+    glm::vec3(-1.3f,  1.0f, -1.5f)
+};
--- a/13-multiple-lights/src/dbc.cpp
+++ b/13-multiple-lights/src/dbc.cpp
@ -0,0 +1,47 @@
+#include "dbc.hpp"
+#include <iostream>
+
+void dbc::log(const string &message, const std::source_location location) {
+  std::cout << '[' << location.file_name() << ':'
+     << location.line() << "|"
+     << location.function_name() << "] "
+     << message << std::endl;
+}
+
+void dbc::sentinel(const string &message, const std::source_location location) {
+  string err = $F("[SENTINEL!] {}", message);
+  dbc::log(err, location);
+  throw dbc::SentinelError(err);
+}
+
+void dbc::pre(const string &message, bool test, const std::source_location location) {
+  if(!test) {
+    string err = $F("[PRE!] {}", message);
+    dbc::log(err, location);
+    throw dbc::PreCondError(err);
+  }
+}
+
+void dbc::pre(const string &message, std::function<bool()> tester, const std::source_location location) {
+  dbc::pre(message, tester(), location);
+}
+
+void dbc::post(const string &message, bool test, const std::source_location location) {
+  if(!test) {
+    string err = $F("[POST!] {}", message);
+    dbc::log(err, location);
+    throw dbc::PostCondError(err);
+  }
+}
+
+void dbc::post(const string &message, std::function<bool()> tester, const std::source_location location) {
+  dbc::post(message, tester(), location);
+}
+
+void dbc::check(bool test, const string &message, const std::source_location location) {
+  if(!test) {
+    string err = $F("[CHECK!] {}\n", message);
+    dbc::log(err, location);
+    throw dbc::CheckError(err);
+  }
+}
--- a/13-multiple-lights/src/dbc.hpp
+++ b/13-multiple-lights/src/dbc.hpp
@ -0,0 +1,46 @@
+#pragma once
+
+#include <string>
+#include <fmt/core.h>
+#include <functional>
+#include <source_location>
+
+// AKA the Fuckit macro
+#define $F(FMT, ...) fmt::format(FMT, ##__VA_ARGS__)
+
+namespace dbc {
+  using std::string;
+
+  using CheckError = std::runtime_error;
+  using SentinelError = std::runtime_error;
+  using PreCondError = std::runtime_error;
+  using PostCondError = std::runtime_error;
+
+  void log(const string &message,
+      const std::source_location location =
+      std::source_location::current());
+
+  [[noreturn]] void sentinel(const string &message,
+      const std::source_location location =
+      std::source_location::current());
+
+  void pre(const string &message, bool test,
+      const std::source_location location =
+      std::source_location::current());
+
+  void pre(const string &message, std::function<bool()> tester,
+      const std::source_location location =
+      std::source_location::current());
+
+  void post(const string &message, bool test,
+      const std::source_location location =
+      std::source_location::current());
+
+  void post(const string &message, std::function<bool()> tester,
+      const std::source_location location =
+      std::source_location::current());
+
+  void check(bool test, const string &message,
+      const std::source_location location =
+      std::source_location::current());
+}
--- a/13-multiple-lights/src/main.cpp
+++ b/13-multiple-lights/src/main.cpp
@ -0,0 +1,362 @@
+#define _USE_MATH_DEFINES
+#include <math.h>
+#include "dbc.hpp"
+#include <print>
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <vector>
+#include <functional>
+#include "shader.hpp"
+#include <stb_image.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include "data.hpp"
+#include "model.hpp"
+#include "camera.hpp"
+
+void framebuffer_size_callback(GLFWwindow *window, int width, int height);
+
+const unsigned int SCR_WIDTH = 800;
+const unsigned int SCR_HEIGHT = 600;
+
+const float AMBIENT_LEVEL = 0.25f;
+
+struct Config {
+  Shader shader;
+  Shader lightShader;
+
+  Lighting light{
+    .directional={
+      .direction={-0.2f, -1.0f, -0.3f},
+      .ambient={0.2f, 0.2f, 0.2f},
+      .diffuse={0.8f, 0.8f, 0.8f},
+      .specular={1.0f, 1.0f, 1.0f},
+    },
+    .positioned={
+      {
+        .position={1.2f, 1.0f, 2.0f},
+        .direction={-0.2f, -1.0f, -0.3f},
+        .ambient={0.2f, 0.2f, 0.2f},
+        .diffuse={0.8f, 0.8f, 0.8f},
+        .specular={1.0f, 1.0f, 1.0f},
+        .constant=1.0f,
+        .linear=0.09f,
+        .quadratic=0.032f,
+        .cutOff=12.5f,
+        .outerCutOff=17.5f,
+      },
+      {
+        .position={-1.2f, -1.0f, -2.0f},
+        .direction={0.2f, 1.0f, 0.3f},
+        .ambient={0.2f, 0.2f, 0.2f},
+        .diffuse={0.8f, 0.8f, 0.8f},
+        .specular={1.0f, 1.0f, 1.0f},
+        .constant=1.0f,
+        .linear=0.09f,
+        .quadratic=0.032f,
+        .cutOff=12.5f,
+        .outerCutOff=17.5f,
+      },
+    },
+    .spot={
+      .position={2.2f, 1.0f, 2.0f},
+      .direction={0.0f, 0.0f, -1.0f},
+      .ambient={0.2f, 0.2f, 0.2f},
+      .diffuse={0.8f, 0.8f, 0.8f},
+      .specular={1.0f, 1.0f, 1.0f},
+      .constant=1.0f,
+      .linear=0.09f,
+      .quadratic=0.032f,
+      .cutOff=12.5f,
+      .outerCutOff=17.5f,
+    },
+  };
+
+  glm::vec3 cubePos{2.0f, 0.0f, 0.0f};
+  Camera camera{
+    .pos={2.2f, 1.0f, 2.0f},
+    .movementSpeed=2.0f
+  };
+
+  Material cubeMaterial{
+    .ambient = {1.0f, 0.5f, 0.31f},
+    .shininess = 32.0f,
+    .diffuseMap = 0,
+    .specularMap = 0,
+  };
+
+  unsigned int cubeVAO = 0;
+  unsigned int lightCubeVAO = 0;
+  unsigned int VBO = 0;
+  float deltaTime = 0.0f;
+  float lastFrame = 0.0f;
+
+  void updateDelta() {
+    float currentFrame = glfwGetTime();
+    deltaTime = currentFrame - lastFrame;
+    lastFrame = currentFrame;
+  }
+};
+
+void init_glfw() {
+  glfwInit();
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+}
+
+void framebuffer_size_callback(GLFWwindow *, int width, int height) {
+  glViewport(0, 0, width, height);
+}
+
+void mouse_callback(GLFWwindow *window, double xpos, double ypos) {
+  Camera* camera = static_cast<Camera*>(glfwGetWindowUserPointer(window));
+  camera->mouse_move(xpos, ypos);
+}
+
+void scroll_callback(GLFWwindow *window, double xoffset, double yoffset) {
+  Camera* camera = static_cast<Camera*>(glfwGetWindowUserPointer(window));
+  camera->mouse_scroll(xoffset, yoffset);
+}
+
+GLFWwindow* create_window() {
+  GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
+  dbc::check(window != NULL, "failed to open window");
+
+  glfwMakeContextCurrent(window);
+
+  glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+  auto good = gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
+  dbc::check(good, "failed to load GLAD");
+
+  glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+  glfwSetCursorPosCallback(window, mouse_callback);
+  glfwSetScrollCallback(window, scroll_callback);
+
+  return window;
+}
+
+
+void processInput(GLFWwindow *window, Config& config) {
+  if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
+    glfwSetWindowShouldClose(window, true);
+  }
+
+  if(glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
+    config.camera.forward();
+  }
+
+  if(glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
+    config.camera.back();
+  }
+
+  if(glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
+    config.camera.left();
+  }
+
+  if(glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
+    config.camera.right();
+  }
+
+  if(glfwGetKey(window, GLFW_KEY_L) == GLFW_PRESS) {
+    config.light.directional.adjust(-0.01f);
+  }
+
+  if(glfwGetKey(window, GLFW_KEY_P) == GLFW_PRESS) {
+    config.light.directional.adjust(0.01f);
+  }
+}
+
+unsigned int load_texture(const std::string& image_file) {
+  unsigned int texture_id;
+  glGenTextures(1, &texture_id);
+  glBindTexture(GL_TEXTURE_2D, texture_id);
+
+  // set the texture wrapping parameters
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+  // set texture filtering parameters
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  int width = 0;
+  int height = 0;
+  int nrChannels = 0;
+  stbi_set_flip_vertically_on_load(true);
+
+  unsigned char *data = stbi_load(image_file.c_str(), &width, &height, &nrChannels, 0);
+
+  dbc::check(data != nullptr, std::format("Failed to load texture: {}", image_file));
+
+  dbc::check(nrChannels == 3 || nrChannels == 4,
+      std::format("Image {} has invalid channels {} should be 3 or 4.", image_file, nrChannels));
+
+  auto rgb_or_a = nrChannels == 3 ? GL_RGB : GL_RGBA;
+
+  glTexImage2D(GL_TEXTURE_2D, 0, rgb_or_a, width, height, 0, rgb_or_a, GL_UNSIGNED_BYTE, data);
+  glGenerateMipmap(GL_TEXTURE_2D);
+
+  stbi_image_free(data);
+
+  return texture_id;
+}
+
+Config setup() {
+  glEnable(GL_DEPTH_TEST);
+
+  Config config{
+    .shader={"shaders/13-vert.glsl", "shaders/13-frag.glsl"},
+    .lightShader={"shaders/13-vert.glsl", "shaders/13-lightsource.frag.glsl"},
+  };
+
+  unsigned int VBO = 0;
+  unsigned int lightCubeVAO = 0;
+  unsigned int cubeVAO = 0;
+
+  // cube vao configure, this is the light target
+  glGenVertexArrays(1, &cubeVAO);
+  glGenBuffers(1, &VBO);
+
+  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+  glBindVertexArray(cubeVAO);
+
+  // position attribute
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)0);
+  glEnableVertexAttribArray(0);
+
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)(3 * sizeof(float)));
+  glEnableVertexAttribArray(1);
+
+  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)(6 * sizeof(float)));
+  glEnableVertexAttribArray(2);
+
+  // light vao configure, this is the light source
+  glGenVertexArrays(1, &lightCubeVAO);
+  glBindVertexArray(lightCubeVAO);
+
+  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
+  glEnableVertexAttribArray(0);
+
+  config.lightCubeVAO = lightCubeVAO;
+  config.cubeVAO = cubeVAO;
+  config.VBO = VBO;
+
+  config.cubeMaterial.diffuseMap = load_texture("resources/textures/container2.png");
+  config.cubeMaterial.specularMap = load_texture("resources/textures/container2_specular.png");
+
+  config.shader.use();
+  config.shader.setInt("material.diffuse", 0);
+  config.shader.setInt("material.specular", 1);
+
+  return config;
+}
+
+void draw_cube(size_t pos, Config& config, glm::mat4& projection, glm::mat4& view) {
+  config.shader.setMat4("view", view);
+  config.shader.setMat4("projection", projection);
+  config.shader.setVec3("viewPos", config.camera.pos);
+
+  config.shader.applyMaterial(config.cubeMaterial);
+
+  glm::mat4 model = glm::mat4(1.0f);
+  model = glm::translate(model, cube_positions[pos]);
+
+  float angle = glfwGetTime() * (float)pos;
+  model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
+
+  config.shader.setMat4("model", model);
+
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, config.cubeMaterial.diffuseMap);
+
+  glActiveTexture(GL_TEXTURE1);
+  glBindTexture(GL_TEXTURE_2D, config.cubeMaterial.specularMap);
+
+  glBindVertexArray(config.cubeVAO);
+  glDrawArrays(GL_TRIANGLES, 0, 36);
+}
+
+void draw_light(Config& config, Light& light, glm::mat4& projection, glm::mat4& view) {
+  config.lightShader.use();
+
+  config.lightShader.setVec3("diffuse", light.diffuse);
+  config.lightShader.setMat4("projection", projection);
+  config.lightShader.setMat4("view", view);
+
+  glm::mat4 model = glm::mat4(1.0f);
+  model = glm::translate(model, light.position);
+  model = glm::scale(model, glm::vec3(0.2f));
+  config.lightShader.setMat4("model", model);
+
+  glBindVertexArray(config.lightCubeVAO);
+  glDrawArrays(GL_TRIANGLES, 0, 36);
+}
+
+void render(GLFWwindow* window, Config& config) {
+  glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  config.shader.use();
+
+  // time is used for fake 3d rotation
+  float time = glfwGetTime();
+
+  config.camera.update(config.deltaTime);
+
+  glm::mat4 view = config.camera.lookAt();
+  glm::mat4 projection = glm::mat4(1.0f);
+
+  // fov, aspect, near plane, far plane
+  projection = glm::perspective(glm::radians(config.camera.fov), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
+
+  config.shader.use();
+  config.light.spot.position = config.camera.pos;
+  config.light.spot.direction = config.camera.front;
+  config.shader.applyLighting(config.light);
+
+  for(size_t i = 0; i < CUBE_COUNT; i++) {
+    draw_cube(i, config, projection, view);
+  }
+
+  for(auto& light : config.light.positioned) {
+    draw_light(config, light, projection, view);
+  }
+
+  glfwSwapBuffers(window);
+  glfwPollEvents();
+}
+
+void cleanup(Config& config) {
+  glDeleteVertexArrays(1, &config.lightCubeVAO);
+  glDeleteBuffers(1, &config.lightCubeVAO);
+  glDeleteBuffers(1, &config.VBO);
+  config.shader.cleanup();
+}
+
+int main() {
+  init_glfw();
+
+  auto window = create_window();
+  auto config = setup();
+
+  glfwSetWindowUserPointer(window, &config.camera);
+
+  while(!glfwWindowShouldClose(window)) {
+    processInput(window, config);
+    render(window, config);
+    config.updateDelta();
+  }
+
+  cleanup(config);
+
+  glfwTerminate();
+
+  return 0;
+}
--- a/13-multiple-lights/src/mesh.cpp
+++ b/13-multiple-lights/src/mesh.cpp
@ -0,0 +1,57 @@
+#include "mesh.hpp"
+
+void Mesh::Draw(Shader &shader) {
+  unsigned int diffuseNr = 1;
+  unsigned int specularNr = 1;
+  unsigned int normalNr = 1;
+  unsigned int heightNr = 1;
+
+  for(unsigned int i = 0; i < textures.size(); i++) {
+    glActiveTexture(GL_TEXTURE0 + i);
+    std::string number;
+    std::string name = textures[i].type;
+
+    if(name == "texture_diffuse") {
+      number = std::to_string(diffuseNr++);
+    } else if(name == "texture_specular") {
+      number = std::to_string(specularNr++);
+    } else if(name == "texture_normal") {
+      number = std::to_string(normalNr++);
+    } else if(name == "texture_height") {
+      number = std::to_string(heightNr++);
+    }
+
+    // TODO: Get this uniform ID once and cache it?
+    glUniform1i(glGetUniformLocation(shader.ID, (name + number).c_str()), i);
+    glBindTexture(GL_TEXTURE_2D, textures[i].id);
+  }
+
+  glBindVertexArray(VAO);
+  glDrawElements(GL_TRIANGLES, static_cast<unsigned int>(indices.size()), GL_UNSIGNED_INT, 0);
+  glBindVertexArray(0);
+
+  glActiveTexture(GL_TEXTURE0);
+}
+
+
+void Mesh::setupMesh() {
+  glGenVertexArrays(1, &VAO);
+  glGenBuffers(1, &VBO);
+  glGenBuffers(1, &EBO);
+
+  glBindVertexArray(VAO);
+  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+  glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW);
+
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), indices.data(), GL_STATIC_DRAW);
+
+  glEnableVertexAttribArray(0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Position));
+
+  glEnableVertexAttribArray(1);
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Normal));
+
+  glEnableVertexAttribArray(2);
+  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, TexCoords));
+}
--- a/13-multiple-lights/src/mesh.hpp
+++ b/13-multiple-lights/src/mesh.hpp
@ -0,0 +1,42 @@
+#pragma once
+
+#include <glad/glad.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "shader.hpp"
+
+#include <string>
+#include <vector>
+
+struct Vertex {
+  glm::vec3 Position;
+  glm::vec3 Normal;
+  glm::vec2 TexCoords;
+};
+
+struct Texture {
+  unsigned int id;
+  std::string type;
+  std::string path;
+};
+
+struct Mesh {
+  std::vector<Vertex> vertices;
+  std::vector<unsigned int> indices;
+  std::vector<Texture> textures;
+  unsigned int VAO;
+  unsigned int VBO;
+  unsigned int EBO;
+
+  Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices, std::vector<Texture> textures) :
+    vertices(vertices),
+    indices(indices),
+    textures(textures)
+  {
+    setupMesh();
+  }
+
+  void Draw(Shader &shader);
+  void setupMesh();
+};
--- a/13-multiple-lights/src/model.cpp
+++ b/13-multiple-lights/src/model.cpp
@ -0,0 +1,171 @@
+#include "model.hpp"
+#include "dbc.hpp"
+
+unsigned int TextureFromFile(const std::string& path, const std::string& directory, bool gamma)
+{
+  std::string filename = path + "/" + filename;
+
+  unsigned int textureID;
+  glGenTextures(1, &textureID);
+
+  int width = 0;
+  int height = 0;
+  int nrComponents = 0;
+
+  unsigned char *data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);
+  dbc::check(data != nullptr, $F("Failed to load texture {}", filename));
+
+  GLenum format = GL_RGB;
+
+  if (nrComponents == 1) {
+    format = GL_RED;
+  } else if (nrComponents == 3) {
+    format = GL_RGB;
+  } else if (nrComponents == 4) {
+    format = GL_RGBA;
+  }
+
+  glBindTexture(GL_TEXTURE_2D, textureID);
+  glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
+  glGenerateMipmap(GL_TEXTURE_2D);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  stbi_image_free(data);
+
+  return textureID;
+}
+
+void Model::Draw(Shader &shader) {
+  for(unsigned int i = 0; i < meshes.size(); i++) {
+    meshes[i].Draw(shader);
+  }
+}
+
+void Model::loadModel(std::string path) {
+  Assimp::Importer importer;
+  const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_GenSmoothNormals | aiProcess_FlipUVs | aiProcess_CalcTangentSpace);
+
+  dbc::check(scene != nullptr, "Assimp ReadFile return null");
+  dbc::check(!(scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE), "Assimp says incomplete.");
+  dbc::check(scene->mRootNode != nullptr, "Assimp loaded scene doesn't have a root node");
+
+  directory = path.substr(0, path.find_last_of('/'));
+
+  processNode(scene->mRootNode, scene);
+}
+
+void Model::processNode(aiNode *node, const aiScene *scene) {
+  for(unsigned int i = 0; i < node->mNumMeshes; i++) {
+    aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
+    meshes.push_back(processMesh(mesh, scene));
+  }
+
+  for(unsigned int i = 0; i < node->mNumChildren; i++) {
+    processNode(node->mChildren[i], scene);
+  }
+}
+
+Mesh Model::processMesh(aiMesh *mesh, const aiScene *scene) {
+  std::vector<Vertex> vertices;
+  std::vector<unsigned int> indices;
+  std::vector<Texture> textures;
+
+  for(unsigned int i = 0; i < mesh->mNumVertices; i++) {
+    Vertex vertex;
+    vertex.Position = glm::vec3(
+      mesh->mVertices[i].x,
+      mesh->mVertices[i].y,
+      mesh->mVertices[i].z);
+
+    if(mesh->HasNormals()) {
+      vertex.Normal = glm::vec3(
+        mesh->mNormals[i].x,
+        mesh->mNormals[i].y,
+        mesh->mNormals[i].z);
+    }
+
+    if(mesh->mTextureCoords[0]) {
+      vertex.TexCoords = glm::vec2(
+          mesh->mTextureCoords[0][i].x,
+          mesh->mTextureCoords[0][i].y
+      );
+    } else {
+      vertex.TexCoords = glm::vec2(0.0f, 0.0f);
+    }
+
+    vertices.push_back(vertex);
+  }
+
+  for(unsigned int i = 0; i < mesh->mNumFaces; i++) {
+    aiFace face = mesh->mFaces[i];
+
+    for(unsigned int j = 0; j < face.mNumIndices; j++) {
+      indices.push_back(face.mIndices[j]);
+    }
+  }
+
+  aiMaterial* material = scene->mMaterials[mesh->mMaterialIndex];
+
+  // we assume a convention for sampler names in the shaders. Each diffuse texture should be named
+  // as 'texture_diffuseN' where N is a sequential number ranging from 1 to MAX_SAMPLER_NUMBER.
+  // Same applies to other texture as the following list summarizes:
+  // diffuse: texture_diffuseN
+  // specular: texture_specularN
+  // normal: texture_normalN
+
+  // 1. diffuse maps
+  std::vector<Texture> diffuseMaps = loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse");
+  textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
+
+  // 2. specular maps
+  std::vector<Texture> specularMaps = loadMaterialTextures(material, aiTextureType_SPECULAR, "texture_specular");
+  textures.insert(textures.end(), specularMaps.begin(), specularMaps.end());
+
+  // 3. normal maps
+  std::vector<Texture> normalMaps = loadMaterialTextures(material, aiTextureType_HEIGHT, "texture_normal");
+  textures.insert(textures.end(), normalMaps.begin(), normalMaps.end());
+
+  // 4. height maps
+  std::vector<Texture> heightMaps = loadMaterialTextures(material, aiTextureType_AMBIENT, "texture_height");
+  textures.insert(textures.end(), heightMaps.begin(), heightMaps.end());
+
+  return Mesh(vertices, indices, textures);
+}
+
+std::vector<Texture> Model::loadMaterialTextures(aiMaterial *mat, aiTextureType type, std::string typeName)
+{
+  fmt::println("TEXTURE COUNT: {}, {}, {}", (int)type, typeName, mat->GetTextureCount(type));
+
+  std::vector<Texture> textures;
+  for(unsigned int i = 0; i < mat->GetTextureCount(type); i++) {
+    aiString str;
+    mat->GetTexture(type, i, &str);
+    std::string tx_str{str.C_Str()};
+
+    bool skip = false;
+    for(unsigned int j = 0; j < textures_loaded.size(); j++) {
+      if(textures_loaded[j].path == tx_str) {
+        textures.push_back(textures_loaded[j]);
+        skip = true;
+        break;
+      }
+    }
+
+    if(!skip) {
+      Texture texture{
+        .id = TextureFromFile(tx_str, directory),
+        .type = typeName,
+        .path = tx_str,
+      };
+
+      textures.push_back(texture);
+      textures_loaded.push_back(texture);
+    }
+  }
+
+  return textures;
+}
--- a/13-multiple-lights/src/model.hpp
+++ b/13-multiple-lights/src/model.hpp
@ -0,0 +1,40 @@
+#pragma once
+#include <glad/glad.h>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <stb_image.h>
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+#include <assimp/postprocess.h>
+
+#include <mesh.hpp>
+#include <shader.hpp>
+
+#include <vector>
+#include <string>
+#include <fstream>
+#include <sstream>
+#include <iostream>
+#include <map>
+#include <vector>
+
+unsigned int TextureFromFile(const std::string& path, const std::string& directory, bool gamma = false);
+
+struct Model {
+  std::vector<Texture> textures_loaded;
+  std::vector<Mesh> meshes;
+  std::string directory;
+  bool gammaCorrection;
+
+  Model(const char *path) {
+    loadModel(path);
+  }
+
+  void Draw(Shader &shader);
+
+  void loadModel(std::string path);
+  void processNode(aiNode *node, const aiScene *scene);
+  Mesh processMesh(aiMesh *mesh, const aiScene *scene);
+
+  std::vector<Texture> loadMaterialTextures(aiMaterial *mat, aiTextureType type, std::string typeName);
+};
--- a/13-multiple-lights/src/physics.cpp
+++ b/13-multiple-lights/src/physics.cpp
@ -0,0 +1,49 @@
+#include "physics.hpp"
+
+struct BoxTest Box2d_setup(b2World &world) {
+  BoxTest box;
+  float wall_x[4] = {0.0f, 0.0f, -0.99f, 0.99f};
+  float wall_y[4] = {-0.99, 0.99f, 0.0f, 0.0f};
+  float bound_w[4] = {1.0f, 1.0f, 0.1f, 0.1f};
+  float bound_h[4] = {0.1f, 0.1f, 1.0f, 1.0f};
+
+  for(size_t i = 0; i < 4; i++) {
+    b2BodyDef groundBodyDef;
+    groundBodyDef.position.Set(wall_x[i], wall_y[i]);
+    b2Body *groundBody = world.CreateBody(&groundBodyDef);
+
+    b2PolygonShape groundBox;
+    groundBox.SetAsBox(bound_w[i], bound_h[i]);
+    groundBody->CreateFixture(&groundBox, 1.0f);
+
+    box.walls[i] = groundBody;
+  }
+
+  for(size_t i = 0; i < BODY_COUNT; i++) {
+    b2BodyDef bodyDef;
+    bodyDef.type = b2_dynamicBody;
+    bodyDef.position.Set(0.0f, 0.5f);
+    box.bodies[i] = world.CreateBody(&bodyDef);
+
+    b2PolygonShape dynamicBox;
+    dynamicBox.SetAsBox(0.1f, 0.1f);
+    b2FixtureDef fixtureDef;
+    fixtureDef.shape = &dynamicBox;
+
+    fixtureDef.density = 1.0f;
+    fixtureDef.friction = 0.3f;
+
+    box.bodies[i]->CreateFixture(&fixtureDef);
+  }
+
+  return box;
+}
+
+void Box2d_step_world(b2World& world) {
+  float timeStep = 1.0f / 60.0f;
+  int velocityIterations = 6;
+  int positionIterations = 2;
+
+  // step the world
+  world.Step(timeStep, velocityIterations, positionIterations);
+}
--- a/13-multiple-lights/src/physics.hpp
+++ b/13-multiple-lights/src/physics.hpp
@ -0,0 +1,13 @@
+#pragma once
+
+#include <box2d/box2d.h>
+
+#define BODY_COUNT 1
+
+struct BoxTest {
+  b2Body *walls[4];
+  b2Body *bodies[BODY_COUNT];
+};
+
+struct BoxTest Box2d_setup(b2World &world);
+void Box2d_step_world(b2World& world);
--- a/13-multiple-lights/src/shader.cpp
+++ b/13-multiple-lights/src/shader.cpp
@ -0,0 +1,126 @@
+#include "shader.hpp"
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <print>
+#include <filesystem>
+#include "dbc.hpp"
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+namespace fs = std::filesystem;
+
+inline std::string read_file(const std::string& filename) {
+  // load the file
+  std::ifstream in_file{filename, std::ios::binary};
+
+  // get the size of the file
+  std::stringstream in_str;
+  in_str << in_file.rdbuf();
+  return in_str.str();
+}
+
+void check_error(const std::string& what, unsigned int thing, GLenum check_type) {
+  int success = 0;
+  char infoLog[512] = {0};
+
+  if(check_type == GL_LINK_STATUS) {
+    glGetProgramiv(thing, check_type, &success);
+
+    if(!success) {
+      glGetProgramInfoLog(thing, 512, NULL, infoLog);
+      dbc::sentinel(std::format("ERROR: Program {} compile failed: {}", what, infoLog));
+    }
+  } else {
+    glGetShaderiv(thing, check_type, &success);
+
+    if(!success) {
+      glGetShaderInfoLog(thing, 512, NULL, infoLog);
+      dbc::sentinel(std::format("ERROR: Shader {} compile failed: {}", what, infoLog));
+    }
+  }
+}
+
+unsigned int Shader::load_shader(const std::string& filename, GLenum shader_type) {
+  dbc::check(fs::exists(filename),
+      std::format("shader file {} does not exist", filename));
+
+  // create the shader
+  std::string shader_code = read_file(filename);
+  const char* shader_code_ptr = shader_code.c_str();
+
+  int shader_id = glCreateShader(shader_type);
+  glShaderSource(shader_id, 1, &shader_code_ptr, NULL);
+  glCompileShader(shader_id);
+
+  check_error(filename, shader_id, GL_COMPILE_STATUS);
+
+  // check compile error
+  return shader_id;
+}
+
+Shader::Shader(const char* vertexPath, const char* fragmentPath) {
+  unsigned int vertex = load_shader(vertexPath, GL_VERTEX_SHADER);
+  unsigned int fragment = load_shader(fragmentPath, GL_FRAGMENT_SHADER);
+
+  ID = glCreateProgram();
+  glAttachShader(ID, vertex);
+  glAttachShader(ID, fragment);
+  glLinkProgram(ID);
+
+  check_error("link", ID, GL_LINK_STATUS);
+
+  glDeleteShader(vertex);
+  glDeleteShader(fragment);
+}
+
+void Shader::use() const {
+  glUseProgram(ID);
+}
+
+void Shader::cleanup() {
+  glDeleteProgram(ID);
+}
+
+void Shader::setBool(const std::string &name, bool value) const {
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform1i(uniform, (int)value);
+}
+
+void Shader::setInt(const std::string &name, int value) const {
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform1i(uniform, value);
+}
+
+void Shader::setFloat(const std::string &name, float value) const {
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform1f(uniform, value);
+}
+
+void Shader::setVec4(const std::string &name, float v1, float v2, float v3, float v4) const {
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform4f(uniform, v1, v2, v3, v4);
+}
+
+void Shader::setVec4(const std::string &name, const glm::vec4& value) const
+{
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform4fv(uniform, 1, &value[0]);
+}
+
+void Shader::setVec3(const std::string &name, const glm::vec3& value) const
+{
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform3fv(uniform, 1, &value[0]);
+}
+
+void Shader::setVec3(const std::string &name, float v1, float v2, float v3) const {
+  auto uniform = glGetUniformLocation(ID, name.c_str());
+  glUniform3f(uniform, v1, v2, v3);
+}
+
+void Shader::setMat4(const std::string &name, const glm::mat4& mat) const {
+  unsigned int loc = glGetUniformLocation(ID, name.c_str());
+  glUniformMatrix4fv(loc, 1, GL_FALSE, glm::value_ptr(mat));
+}
--- a/13-multiple-lights/src/shader.hpp
+++ b/13-multiple-lights/src/shader.hpp
@ -0,0 +1,112 @@
+#pragma once
+
+#include <glad/glad.h>
+#include <string>
+#include <climits>
+#include <glm/glm.hpp>
+#include <vector>
+#include <format>
+#include "dbc.hpp"
+
+struct Material {
+  glm::vec3 ambient{0.1f,0.1f,0.1f};
+  float shininess{32.0f};
+  unsigned int diffuseMap = 0;
+  unsigned int specularMap = 0;
+};
+
+struct Light {
+  glm::vec3 position{0.0f, 0.0f, 0.0f};
+  glm::vec3 direction{0.0f, 0.0f, 0.0f};
+  glm::vec3 ambient{0.0f, 0.0f, 0.0f};
+  glm::vec3 diffuse{0.0f, 0.0f, 0.0f};
+  glm::vec3 specular{0.0f, 0.0f, 0.0f};
+  float constant=0.0f;
+  float linear=0.0f;
+  float quadratic=0.0f;
+  float cutOff=0.0f;
+  float outerCutOff=0.0f;
+
+  void adjust(float amount) {
+    ambient += amount;
+    diffuse += amount;
+    specular += amount;
+  }
+};
+
+
+#define NR_POINT_LIGHTS 4
+
+struct Lighting {
+  Light directional;
+  std::vector<Light> positioned;
+  Light spot;
+};
+
+class Shader
+{
+public:
+  unsigned int ID = UINT_MAX;
+
+  Shader(const char* vertexPath, const char* fragmentPath);
+  unsigned int load_shader(const std::string& filename, GLenum shader_type);
+  void use() const;
+  void setBool(const std::string &name, bool value) const;
+  void setInt(const std::string &name, int value) const;
+  void setFloat(const std::string &name, float value) const;
+  void setVec4(const std::string &name, float v1, float v2, float v3, float v4) const;
+  void setVec4(const std::string &name, const glm::vec4& value) const;
+  void setVec3(const std::string &name, float v1, float v2, float v3) const;
+  void setVec3(const std::string &name, const glm::vec3& value) const;
+  void setMat4(const std::string &name, const glm::mat4& what) const;
+  void cleanup();
+
+  void applyMaterial(const Material& material) {
+    setVec3("material.ambient", material.ambient);
+    setFloat("material.shininess", material.shininess);
+  }
+
+  void applyLighting(const Lighting& lighting) {
+    applyDirLight(lighting.directional);
+    setInt("pointLightCount", lighting.positioned.size());
+
+    for(size_t i = 0; i < lighting.positioned.size(); i++) {
+      applyPointLight(lighting.positioned[i], i);
+    }
+
+    applySpotLight(lighting.spot);
+  }
+
+  void applyDirLight(const Light& light) {
+    setVec3("dirLight.direction", light.direction);
+    setVec3("dirLight.ambient", light.ambient);
+    setVec3("dirLight.diffuse", light.diffuse);
+    setVec3("dirLight.specular", light.specular);
+  }
+
+  void applyPointLight(const Light& light, size_t index) {
+    dbc::check(index < NR_POINT_LIGHTS, "too many positioned lights");
+
+    setVec3(std::format("pointLights[{}].position", index), light.position);
+    setVec3(std::format("pointLights[{}].ambient", index), light.ambient);
+    setVec3(std::format("pointLights[{}].diffuse", index), light.diffuse);
+    setVec3(std::format("pointLights[{}].specular", index), light.specular);
+
+    setFloat(std::format("pointLights[{}].constant", index), light.constant);
+    setFloat(std::format("pointLights[{}].linear", index), light.linear);
+    setFloat(std::format("pointLights[{}].quadratic", index), light.quadratic);
+  }
+
+  void applySpotLight(const Light& light) {
+    setVec3("spotLight.position", light.position);
+    setVec3("spotLight.direction", light.direction);
+    setVec3("spotLight.ambient", light.ambient);
+    setVec3("spotLight.diffuse", light.diffuse);
+    setVec3("spotLight.specular", light.specular);
+    setFloat("spotLight.constant",  light.constant);
+    setFloat("spotLight.linear",    light.linear);
+    setFloat("spotLight.quadratic", light.quadratic);
+    setFloat("spotLight.cutOff", glm::cos(glm::radians(light.cutOff)));
+    setFloat("spotLight.outerCutOff", glm::cos(glm::radians(light.outerCutOff)));
+  }
+};
--- a/13-multiple-lights/src/stb_image.cpp
+++ b/13-multiple-lights/src/stb_image.cpp
@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
--- a/13-multiple-lights/src/stb_image.h
+++ b/13-multiple-lights/src/stb_image.h
--- a/13-multiple-lights/tests/bad_shader.vs
+++ b/13-multiple-lights/tests/bad_shader.vs
@ -0,0 +1,10 @@
+#version 330 core
+layout (location = 0) in vec3 aPos; // the position variable has attribute position 0
+
+out vec4 vertexColor; // specify a color output to the fragment shader
+
+void main()
+// syntax error here
+    gl_Position = vec4(aPos, 1.0); // see how we directly give a vec3 to vec4's constructor
+    vertexColor = vec4(0.5, 0.0, 0.0, 1.0); // set the output variable to a dark-red color
+}
--- a/13-multiple-lights/tests/main.cpp
+++ b/13-multiple-lights/tests/main.cpp
@ -0,0 +1,38 @@
+#include <fuc2/run.hpp>
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include "dbc.hpp"
+
+TEST_SET(shader_tests);
+
+using namespace fuc2;
+
+int main(int argc, char* argv[]) {
+  glfwInit();
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+  GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
+  if (window == NULL)
+  {
+      dbc::log("Failed to create GLFW window");
+      glfwTerminate();
+      return -1;
+  }
+  glfwMakeContextCurrent(window);
+
+  // glad: load all OpenGL function pointers
+  // ---------------------------------------
+  if(!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+  {
+    dbc::log("Failed to initialize GLAD");
+    return -1;
+  }
+
+  std::vector<fuc2::Set> tests{
+      shader_tests::TESTS
+  };
+
+  return run_tests(tests, argc, argv);
+}
--- a/13-multiple-lights/tests/meson.build
+++ b/13-multiple-lights/tests/meson.build
@ -0,0 +1,4 @@
+fuc2_tests = files(
+  'main.cpp',
+  'shader_tests.cpp',
+)
--- a/13-multiple-lights/tests/shader_tests.cpp
+++ b/13-multiple-lights/tests/shader_tests.cpp
@ -0,0 +1,33 @@
+#include <deque>
+#include <string>
+#include <fuc2/testing.hpp>
+#include "shader.hpp"
+
+using namespace fuc2;
+
+namespace shader_tests {
+  void test_load_shaders() {
+    Shader shader("shaders/3.3.shader.vs", "shaders/3.3.shader.fs");
+
+    shader.use();
+
+    CHECK(shader.ID != UINT_MAX, "Shader not initialized");
+  }
+
+  void test_compile_fail() {
+    auto runner = [&]() {
+      Shader shader("tests/bad_shader.vs", "shaders/3.3.shader.fs");
+    };
+
+    BLOWS_UP(runner, "compile fail should blow up");
+  }
+
+  fuc2::Set TESTS{
+    .name="shaders",
+      .options={ .fail_fast=false },
+      .tests={
+        TEST(test_load_shaders),
+        TEST(test_compile_fail),
+      }
+  };
+}
--- a/13-multiple-lights/wraps/assimp.wrap
+++ b/13-multiple-lights/wraps/assimp.wrap
@ -0,0 +1,9 @@
+[wrap-git]
+directory=assimp-5.4.3
+url=https://github.com/assimp/assimp.git
+revision=v5.4.3
+depth=1
+method=cmake
+
+[provide]
+assimp = assimp_dep
--- a/13-multiple-lights/wraps/box2d.wrap
+++ b/13-multiple-lights/wraps/box2d.wrap
@ -0,0 +1,13 @@
+[wrap-file]
+directory = box2d-2.4.1
+source_url = https://github.com/erincatto/box2d/archive/v2.4.1/box2d-2.4.1.tar.gz
+source_filename = box2d-2.4.1.tar.gz
+source_hash = d6b4650ff897ee1ead27cf77a5933ea197cbeef6705638dd181adc2e816b23c2
+patch_filename = box2d_2.4.1-4_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/box2d_2.4.1-4/get_patch
+patch_hash = f5235178029fa0a8deaf8dddbccfd70739b289cffbeec5c98fc91209683c4802
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/box2d_2.4.1-4/box2d-2.4.1.tar.gz
+wrapdb_version = 2.4.1-4
+
+[provide]
+box2d = box2d_dep
--- a/13-multiple-lights/wraps/fmt.wrap
+++ b/13-multiple-lights/wraps/fmt.wrap
@ -0,0 +1,13 @@
+[wrap-file]
+directory = fmt-11.0.2
+source_url = https://github.com/fmtlib/fmt/archive/11.0.2.tar.gz
+source_filename = fmt-11.0.2.tar.gz
+source_hash = 6cb1e6d37bdcb756dbbe59be438790db409cdb4868c66e888d5df9f13f7c027f
+patch_filename = fmt_11.0.2-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/fmt_11.0.2-1/get_patch
+patch_hash = 90c9e3b8e8f29713d40ca949f6f93ad115d78d7fb921064112bc6179e6427c5e
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/fmt_11.0.2-1/fmt-11.0.2.tar.gz
+wrapdb_version = 11.0.2-1
+
+[provide]
+fmt = fmt_dep
--- a/13-multiple-lights/wraps/fuc2.wrap
+++ b/13-multiple-lights/wraps/fuc2.wrap
@ -0,0 +1,9 @@
+[wrap-git]
+directory=fuc2-0.2.0
+url=https://lcthw.dev/cpp/fuc2.git
+revision=HEAD
+depth=1
+method=meson
+
+[provide]
+fuc2 = fuc2_dep
--- a/13-multiple-lights/wraps/glfw.wrap
+++ b/13-multiple-lights/wraps/glfw.wrap
@ -0,0 +1,13 @@
+[wrap-file]
+directory = glfw-3.4
+source_url = https://github.com/glfw/glfw/archive/refs/tags/3.4.tar.gz
+source_filename = glfw-3.4.tar.gz
+source_hash = c038d34200234d071fae9345bc455e4a8f2f544ab60150765d7704e08f3dac01
+patch_filename = glfw_3.4-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/glfw_3.4-1/get_patch
+patch_hash = 58a6a6cdb28195d7f7e6f5de85dff7044d378e49b46bf1d4a9b04c97ed93e6b0
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/glfw_3.4-1/glfw-3.4.tar.gz
+wrapdb_version = 3.4-1
+
+[provide]
+glfw3 = glfw_dep
--- a/13-multiple-lights/wraps/glm.wrap
+++ b/13-multiple-lights/wraps/glm.wrap
@ -0,0 +1,13 @@
+[wrap-file]
+directory = glm-1.0.1
+source_url = https://github.com/g-truc/glm/archive/refs/tags/1.0.1.tar.gz
+source_filename = glm-1.0.1.tar.gz
+source_hash = 9f3174561fd26904b23f0db5e560971cbf9b3cbda0b280f04d5c379d03bf234c
+patch_filename = glm_1.0.1-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/glm_1.0.1-1/get_patch
+patch_hash = 25679275e26bc4c36bb617d1b4a52197039402af828d2a4bf67b3c0260a5df6a
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/glm_1.0.1-1/glm-1.0.1.tar.gz
+wrapdb_version = 1.0.1-1
+
+[provide]
+glm = glm_dep