source: GTP/trunk/App/Demos/Vis/CHC_revisited/RenderState.cpp @ 2769

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


namespace CHCDemo 
{


/** Constructor setting render as default state.
*/
RenderState::RenderState():
mAlphaTestEnabled(false), mTexturesEnabled(false), mMode(RENDER) 
{
        Reset(); 
}

        
bool RenderState::SetState(Mode mode)
{
        //-- just change the modewhen necessary
        if (mode == mMode) return false;

        mMode = mode;
        //++ state_changes;

        if (mode == QUERY)
        {
                //glDisableClientState(GL_NORMAL_ARRAY);
                glDisable(GL_LIGHTING);
                glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
                glDepthMask(GL_FALSE);


                /////////
                //-- handle vbo

                /*glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);

                if (Bvh::sCurrentVboId != -1)
                        glBindBufferARB(GL_ARRAY_BUFFER_ARB, Bvh::sCurrentVboId);
                else
                        glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
                */

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

                glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
                glDepthMask(GL_TRUE);
                glEnable(GL_LIGHTING);
        }

        return true;
}

        
void RenderState::SetState(bool texturing, bool alphaTest)
{
        if (mTexturesEnabled && !texturing) 
        {
                mTexturesEnabled = false;
                glDisable(GL_TEXTURE_2D);
                glDisableClientState(GL_TEXTURE_COORD_ARRAY);
        }
        else if (!mTexturesEnabled && texturing)
        {
                mTexturesEnabled = true;
                glEnable(GL_TEXTURE_2D);
                glEnableClientState(GL_TEXTURE_COORD_ARRAY);
        }

        if (mAlphaTestEnabled && !alphaTest) 
        {
                mAlphaTestEnabled = false;
                glDisable(GL_ALPHA_TEST);
        }
        else if (!mAlphaTestEnabled && alphaTest)
        {
                mAlphaTestEnabled = true;
                glEnable(GL_ALPHA_TEST);
                glAlphaFunc(GL_GEQUAL, 0.5f);
        }
}


void RenderState::Reset()
{
        SetState(false, false);
        SetState(RENDER);
}


}