FinalBuffer.cpp

#include "FinalBuffer.h"
#include "DrawFunc.h"
#include <assert.h>
#include "Logger.h"
#include "Profiler.h"
#include "GameState.h"
#include "MatrixManager.h"
#include "ShaderManager.h"

FinalBuffer::FinalBuffer(int nWidth, int nHeight)
{
	this->m_nWidth=nWidth;
	this->m_nHeight=nHeight;

	glEnable(GL_TEXTURE_2D);

	glGenFramebuffersEXT(1,&m_nFrameBuffer);
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_nFrameBuffer);

	glGenTextures(1, &m_nFinalTex);
	glBindTexture(GL_TEXTURE_2D, m_nFinalTex);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, m_nWidth, m_nHeight, 0, GL_RGBA, GL_FLOAT, 0);
	glBindTexture(GL_TEXTURE_2D, 0);
	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_nFinalTex, 0);

	// check FbO status
	GLenum FBOstatus = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
	if(FBOstatus != GL_FRAMEBUFFER_COMPLETE_EXT)
	{
		Logging::GRAPHICS->error("GL_FRAMEBUFFER_COMPLETE failed, CANNOT use FBO. " + FBOstatus);
	}
	else
	{
		Logging::GRAPHICS->info("Final Buffer Done");
	}

	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}

FinalBuffer::~FinalBuffer()
{
	glDeleteFramebuffers(1,&m_nFrameBuffer);
}


void FinalBuffer::drawToBuffer(GLuint nColorTex, GLuint nLightTex, GLuint nGlowTex, GLuint indirectTex, GLuint reflectionTex, View *view)
{
	Profiler::getInstance()->startProfile("Draw Final");
	GLSLProgram *glslProgram = ShaderManager::getInstance()->getShader("Final");
	glslProgram->use();

	bind();
	GLenum mrt[] = {GL_COLOR_ATTACHMENT0_EXT};
	glDrawBuffers(1, mrt);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glPushAttrib( GL_VIEWPORT_BIT );
	glViewport( 0, 0, getWidth(), getHeight());

	WorldState *worldState = (WorldState *) GameState::GAMESTATE;

	MatrixManager::getInstance()->putMatrix4(MODELVIEW, glm::mat4(1.0f));
	MatrixManager::getInstance()->putMatrix4(PROJECTION, glm::mat4(1.0f));
	view->use3D(false);

	glBindFragDataLocation(glslProgram->getHandle(), 0, "finalBuffer");
	glBindAttribLocation(glslProgram->getHandle(), 0, "v_vertex");
	glBindAttribLocation(glslProgram->getHandle(), 1, "v_texture");
	glslProgram->sendUniform("projectionMatrix", &MatrixManager::getInstance()->getMatrix4(PROJECTION)[0][0]);

	glActiveTexture(GL_TEXTURE0); 
	glBindTexture(GL_TEXTURE_2D, nColorTex);
	glActiveTexture(GL_TEXTURE1); 
	glBindTexture(GL_TEXTURE_2D, nLightTex);
	glActiveTexture(GL_TEXTURE2); 
	glBindTexture(GL_TEXTURE_2D, nGlowTex);
	glActiveTexture(GL_TEXTURE3); 
	glBindTexture(GL_TEXTURE_2D, indirectTex);
	glActiveTexture(GL_TEXTURE4); 
	glBindTexture(GL_TEXTURE_2D, reflectionTex);
	glslProgram->sendUniform("colorTex",0);
	glslProgram->sendUniform("lightTex",1);
	glslProgram->sendUniform("glowTex",2);
	glslProgram->sendUniform("indirectTex",3);
	glslProgram->sendUniform("reflectionTex",4);

	drawScreenShader(0,0,1.0f,1.0f);
	glFinish();
	glslProgram->disable();
	unbind();	
	Profiler::getInstance()->endProfile();
}

void FinalBuffer::bind() 
{
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_nFrameBuffer);
}
	
void FinalBuffer::unbind() 
{
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}

void FinalBuffer::bindFinalTex() 
{
	glBindTexture(GL_TEXTURE_2D, m_nFinalTex);
}

GLuint FinalBuffer::getFinalTex() 
{
	return m_nFinalTex;
}

int FinalBuffer::getWidth() 
{
	return m_nWidth;
}
	
int FinalBuffer::getHeight() 
{
	return m_nHeight;
}