source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/RenderState.cpp @ 2801

#include "RenderState.h"
#include "glInterface.h"
#include "Geometry.h"
#include "Material.h"


namespace CHCDemoEngine 
{


RenderState::RenderState():
mAlphaTestEnabled(false), 
mTexturesEnabled(false), 
mMode(RENDER),
mIsDepthPass(false)
{
        Reset(); 
}

        
bool RenderState::SetState(Mode mode)
{
        ///////////
        //-- just change the modewhen necessary

        if (mode == mMode) return false;

        mMode = mode;

        if (mode == QUERY)
        {
                if (!mIsDepthPass)
                {
                        glDisable(GL_LIGHTING);
                        glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
                }

                glDepthMask(GL_FALSE);

                SetState(false, false);
        }
        else // mode returns to render
        {
                /////////////
                //-- restore render state

                if (!mIsDepthPass)
                {
                        glEnable(GL_LIGHTING);
                        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
                }

                glDepthMask(GL_TRUE);
        }

        return true;
}

        
void RenderState::SetState(bool texturing, bool alphaTest)
{
        if (mAlphaTestEnabled && !alphaTest) 
        {
                mAlphaTestEnabled = false;
                glDisable(GL_ALPHA_TEST);
        }
        else if (!mAlphaTestEnabled && alphaTest)
        {
                mAlphaTestEnabled = true;
                glEnable(GL_ALPHA_TEST);
        }

        // allow only alpha textures in depth pass
        if (mTexturesEnabled && 
                (!texturing || mIsDepthPass && !mAlphaTestEnabled))
        {
                mTexturesEnabled = false;
                glDisable(GL_TEXTURE_2D);
                glDisableClientState(GL_TEXTURE_COORD_ARRAY);
        }
        else if (!mTexturesEnabled && texturing)
        {
                if (!mIsDepthPass || mAlphaTestEnabled)
                {
                        mTexturesEnabled = true;
                        glEnable(GL_TEXTURE_2D);
                        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
                }
        }
}


void RenderState::Reset()
{
        mCurrentVboId = -1;
        SetState(false, false);
        SetState(RENDER);
}


}