source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/DeferredShader.cpp @ 2858

#include "DeferredShader.h"
#include "glInterface.h"


using namespace std;


namespace CHCDemoEngine
{

void DeferredShader::Render(FrameBufferObject *fbo)
{
        glPushAttrib(GL_VIEWPORT_BIT);
        glViewport(0, 0, fbo->GetWidth(), fbo->GetHeight());

        glDisable(GL_ALPHA_TEST);
        glDisable(GL_TEXTURE_2D);
        glDisable(GL_LIGHTING);
        
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

        const float offs = 0.5f;
        
        glOrtho(-offs, offs, -offs, offs, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        cgGLEnableProfile(RenderState::sCgFragmentProfile);

        cgGLBindProgram(sCgDeferredProgram);

        cgGLSetTextureParameter(sPositionsTexParam, positionsTex);
        cgGLEnableTextureParameter(sPositionsTexParam);

        cgGLSetTextureParameter(sColorsTexParam, colorsTex);
        cgGLEnableTextureParameter(sColorsTexParam);

        cgGLSetTextureParameter(sNormalsTexParam, normalsTex);
        cgGLEnableTextureParameter(sNormalsTexParam);
        
        glColor3f(1.0f, 1.0f, 1.0f);

        glBegin(GL_QUADS);

        float offs2 = 0.5f;

        glTexCoord2f(0, 0); glVertex3f(-offs2, -offs2, -0.5f);
        glTexCoord2f(1, 0); glVertex3f( offs2, -offs2, -0.5f);
        glTexCoord2f(1, 1); glVertex3f( offs2,  offs2, -0.5f);
        glTexCoord2f(0, 1); glVertex3f(-offs2,  offs2, -0.5f);

        glEnd();

        cgGLDisableTextureParameter(sColorsTexParam);
        cgGLDisableTextureParameter(sPositionsTexParam);
        cgGLDisableTextureParameter(sNormalsTexParam);

        cgGLDisableProfile(RenderState::sCgFragmentProfile);
        
        glEnable(GL_LIGHTING);
        glDisable(GL_TEXTURE_2D);
        
        glMatrixMode(GL_PROJECTION);
        glPopMatrix();

        glMatrixMode(GL_MODELVIEW);
        glPopMatrix();

        glPopAttrib();

        PrintGLerror("deferred shading");
}


} // namespace