FrameBuffer.cpp

#include "FrameBuffer.h"
 
#include <glad/glad.h>
 
FrameBuffer::FrameBuffer(int w, int h)
{
    width = w;
    height = h;
    glGenFramebuffers(1, &fbo);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glGenTextures(1, &colorTexture);
    glBindTexture(GL_TEXTURE_2D, colorTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 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, colorTexture, 0);
    glGenTextures(1, &depthTexture);
    glBindTexture(GL_TEXTURE_2D, depthTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, w, h, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
 
FrameBuffer::~FrameBuffer()
{
    glDeleteTextures(1, &colorTexture);
    glDeleteTextures(1, &depthTexture);
    glDeleteFramebuffers(1, &fbo);
}
 
void FrameBuffer::Begin()
{
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glViewport(0, 0, width, height);
}
 
uint32_t FrameBuffer::End()
{
    return colorTexture;
}
 
uint32_t FrameBuffer::GetColorTexture()
{
    return colorTexture;
}
 
uint32_t FrameBuffer::GetDepthTexture()
{
    return depthTexture;
}
 
uint32_t FrameBuffer::GetRendererID()
{
    return fbo;
}