Moving on to cubemaps.

24-cubemaps/src/framebuffer.cpp

@@ -0,0 +1,59 @@
+#include "framebuffer.hpp"
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+void FrameBuffer::init() {
+  // target_fb config
+  glGenFramebuffers(1, &target_fb);
+  glBindFramebuffer(GL_FRAMEBUFFER, target_fb);
+
+  // target_fb configuration
+  // -------------------------
+  glGenFramebuffers(1, &target_fb);
+  glBindFramebuffer(GL_FRAMEBUFFER, target_fb);
+
+  // create a color attachment texture
+  glGenTextures(1, &texture_buffer);
+  glBindTexture(GL_TEXTURE_2D, texture_buffer);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_buffer, 0);
+
+  // create a renderbuffer object for depth and stencil attachment (we won't be sampling these)
+  glGenRenderbuffers(1, &target_rbo);
+  glBindRenderbuffer(GL_RENDERBUFFER, target_rbo);
+  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, SCR_WIDTH, SCR_HEIGHT); // use a single renderbuffer object for both a depth AND stencil buffer.
+  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, target_rbo); // now actually attach it
+  // now that we actually created the target_fb and added all attachments we want to check if it is actually complete now
+
+  dbc::check(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, "Frame buffer not complete.");
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void FrameBuffer::begin() {
+  // target_fb stuff here
+  glBindFramebuffer(GL_FRAMEBUFFER, target_fb);
+  glEnable(GL_DEPTH_TEST);
+
+  glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+}
+
+void FrameBuffer::commit() {
+  // disable the frame buffer
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void FrameBuffer::draw(Screen& screen) {
+  glDisable(GL_DEPTH_TEST);
+
+  glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
+  glClear(GL_COLOR_BUFFER_BIT);
+
+  // render the screen quad
+  screen.shader.use();
+  glBindVertexArray(screen.target_VAO);
+  glBindTexture(GL_TEXTURE_2D, texture_buffer);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+}