72 lines
3 KiB
C++
72 lines
3 KiB
C++
#include "framebuffer.hpp"
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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void FrameBuffer::init() {
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// target_fb configuration
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// -------------------------
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glGenFramebuffers(1, &target_fb);
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glBindFramebuffer(GL_FRAMEBUFFER, target_fb);
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// create the multisamples color attachment texture
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glGenTextures(1, &texture_multi);
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glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture_multi);
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glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGB, SCR_WIDTH, SCR_HEIGHT, GL_TRUE);
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glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, texture_multi, 0);
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// create a renderbuffer object for depth and stencil attachment (we won't be sampling these)
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glGenRenderbuffers(1, &target_rbo);
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glBindRenderbuffer(GL_RENDERBUFFER, target_rbo);
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glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4, GL_DEPTH24_STENCIL8, SCR_WIDTH, SCR_HEIGHT); // use a single renderbuffer object for both a depth AND stencil buffer.
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, target_rbo); // now actually attach it
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// now that we actually created the target_fb and added all attachments we want to check if it is actually complete now
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dbc::check(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, "Frame buffer not complete.");
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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// intermediate fbo here
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glGenFramebuffers(1, &intermediate_fbo);
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glBindFramebuffer(GL_FRAMEBUFFER, intermediate_fbo);
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// create a color attachment texture
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glGenTextures(1, &texture_buffer);
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glBindTexture(GL_TEXTURE_2D, texture_buffer);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_buffer, 0);
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dbc::check(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, "Frame buffer not complete.");
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void FrameBuffer::begin() {
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// target_fb stuff here
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glBindFramebuffer(GL_FRAMEBUFFER, target_fb);
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glEnable(GL_DEPTH_TEST);
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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void FrameBuffer::commit() {
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// disable the frame buffer
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glBindFramebuffer(GL_READ_FRAMEBUFFER, target_fb);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, intermediate_fbo);
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glBlitFramebuffer(0, 0, SCR_WIDTH, SCR_HEIGHT, 0, 0, SCR_WIDTH, SCR_HEIGHT, GL_COLOR_BUFFER_BIT, GL_NEAREST);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void FrameBuffer::draw(Screen& screen) {
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glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glDisable(GL_DEPTH_TEST);
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screen.shader.use();
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glBindVertexArray(screen.target_VAO);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture_buffer);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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}
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