#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);
}


}