FrameBuffer.cpp

#include "FrameBuffer.h"

FrameBuffer::FrameBuffer(int width, int height, int nTex) {
	//generate and bind framebuffer
	glGenFramebuffers(1, &fbo);
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);

	//generate texture to render to 
	glGenTextures(nTex, tex);
	for (int i = 0; i < nTex; i++) {
		glBindTexture(GL_TEXTURE_2D, tex[i]);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, 0);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		glBindTexture(GL_TEXTURE_2D, 0);

		//attach texture to framebuffer
		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex[i], 0);
	}

	//generate render buffer for depth testing 
	unsigned int rbo;
	glGenRenderbuffers(1, &rbo);
	glBindRenderbuffer(GL_RENDERBUFFER, rbo);
	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
	glBindRenderbuffer(GL_RENDERBUFFER, 0);
	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);

	//unbind framebuffer
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}

FrameBuffer::~FrameBuffer() {
	glDeleteTextures(GL_TEXTURE_2D, tex);
	glDeleteFramebuffers(GL_FRAMEBUFFER, &fbo);
}