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./aip/1.8aipmod/source/Irrlicht/CTRStencilShadow.cpp :


// Copyright (C) 2002-2011 Nikolaus Gebhardt / Thomas Alten

// This file is part of the "Irrlicht Engine".

// For conditions of distribution and use, see copyright notice in irrlicht.h


#include "IrrCompileConfig.h"
#include "IBurningShader.h"

#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_

// compile flag for this file

#undef USE_ZBUFFER
#undef USE_SBUFFER
#undef IPOL_Z
#undef CMP_Z
#undef WRITE_Z

#undef IPOL_W
#undef CMP_W
#undef WRITE_W

#undef SUBTEXEL
#undef INVERSE_W

#undef IPOL_C0
#undef IPOL_T0
#undef IPOL_T1
#undef IPOL_T2
#undef IPOL_L0

// define render case

#define SUBTEXEL
//#define INVERSE_W


#define USE_ZBUFFER
#define USE_SBUFFER
#define IPOL_W
#define CMP_W
//#define WRITE_W



// apply global override

#ifndef SOFTWARE_DRIVER_2_PERSPECTIVE_CORRECT
	#undef INVERSE_W
#endif

#ifndef SOFTWARE_DRIVER_2_SUBTEXEL
	#undef SUBTEXEL
#endif

#ifndef SOFTWARE_DRIVER_2_USE_VERTEX_COLOR
	#undef IPOL_C0
#endif

#if !defined ( SOFTWARE_DRIVER_2_USE_WBUFFER ) && defined ( USE_ZBUFFER )
	#ifndef SOFTWARE_DRIVER_2_PERSPECTIVE_CORRECT
		#undef IPOL_W
	#endif
	#define IPOL_Z

	#ifdef CMP_W
		#undef CMP_W
		#define CMP_Z
	#endif

	#ifdef WRITE_W
		#undef WRITE_W
		#define WRITE_Z
	#endif

#endif


namespace irr
{

namespace video
{

class CTRStencilShadow : public IBurningShader
{
public:

	//! constructor

	CTRStencilShadow(CBurningVideoDriver* driver);

	//! draws an indexed triangle list

	virtual void drawTriangle ( const s4DVertex *a,const s4DVertex *b,const s4DVertex *c );
	virtual void setParam ( u32 index, f32 value);

private:
	// fragment shader

	typedef void (CTRStencilShadow::*tFragmentShader) ();
	void fragment_zfail_decr ();
	void fragment_zfail_incr ();

	tFragmentShader fragmentShader;

	sScanConvertData scan;
	sScanLineData line;

};

//! constructor

CTRStencilShadow::CTRStencilShadow(CBurningVideoDriver* driver)
: IBurningShader(driver)
{
	#ifdef _DEBUG
	setDebugName("CTRStencilShadow");
	#endif
}


/*!
*/
void CTRStencilShadow::setParam ( u32 index, f32 value)
{
	u32 val = (u32) value;

	// glStencilOp (fail,zfail,zpass

	if ( index == 1 && val == 1 )
	{
		fragmentShader = &CTRStencilShadow::fragment_zfail_incr;
	}
	else
	if ( index == 1 && val == 2 )
	{
		fragmentShader = &CTRStencilShadow::fragment_zfail_decr;
	}
}

/*!
*/
void CTRStencilShadow::fragment_zfail_decr ()
{
	if (!Stencil)
		return;
	//tVideoSample *dst;


#ifdef USE_ZBUFFER
	fp24 *z;
#endif

#ifdef USE_SBUFFER
	u32 *stencil;
#endif

	s32 xStart;
	s32 xEnd;
	s32 dx;

#ifdef SUBTEXEL
	f32 subPixel;
#endif

#ifdef IPOL_Z
	f32 slopeZ;
#endif
#ifdef IPOL_W
	fp24 slopeW;
#endif
#ifdef IPOL_C0
	sVec4 slopeC[MATERIAL_MAX_COLORS];
#endif
#ifdef IPOL_T0
	sVec2 slopeT[BURNING_MATERIAL_MAX_TEXTURES];
#endif
#ifdef IPOL_L0
	sVec3 slopeL[BURNING_MATERIAL_MAX_TANGENT];
#endif

	// apply top-left fill-convention, left

	xStart = core::ceil32( line.x[0] );
	xEnd = core::ceil32( line.x[1] ) - 1;

	dx = xEnd - xStart;

	if ( dx < 0 )
		return;

	// slopes

	const f32 invDeltaX = core::reciprocal_approxim ( line.x[1] - line.x[0] );

#ifdef IPOL_Z
	slopeZ = (line.z[1] - line.z[0]) * invDeltaX;
#endif
#ifdef IPOL_W
	slopeW = (line.w[1] - line.w[0]) * invDeltaX;
#endif
#ifdef IPOL_C0
	slopeC[0] = (line.c[0][1] - line.c[0][0]) * invDeltaX;
#endif
#ifdef IPOL_T0
	slopeT[0] = (line.t[0][1] - line.t[0][0]) * invDeltaX;
#endif
#ifdef IPOL_T1
	slopeT[1] = (line.t[1][1] - line.t[1][0]) * invDeltaX;
#endif
#ifdef IPOL_T2
	slopeT[2] = (line.t[2][1] - line.t[2][0]) * invDeltaX;
#endif
#ifdef IPOL_L0
	slopeL[0] = (line.l[0][1] - line.l[0][0]) * invDeltaX;
#endif

#ifdef SUBTEXEL
	subPixel = ( (f32) xStart ) - line.x[0];
#ifdef IPOL_Z
	line.z[0] += slopeZ * subPixel;
#endif
#ifdef IPOL_W
	line.w[0] += slopeW * subPixel;
#endif
#ifdef IPOL_C0
	line.c[0][0] += slopeC[0] * subPixel;
#endif
#ifdef IPOL_T0
	line.t[0][0] += slopeT[0] * subPixel;
#endif
#ifdef IPOL_T1
	line.t[1][0] += slopeT[1] * subPixel;
#endif
#ifdef IPOL_T2
	line.t[2][0] += slopeT[2] * subPixel;
#endif
#ifdef IPOL_L0
	line.l[0][0] += slopeL[0] * subPixel;
#endif
#endif

	//dst = (tVideoSample*)RenderTarget->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;


#ifdef USE_ZBUFFER
	z = (fp24*) DepthBuffer->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;
#endif

#ifdef USE_SBUFFER
	stencil = (u32*) Stencil->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;
#endif


#ifdef INVERSE_W
	f32 inversew;
#endif


#ifdef IPOL_C0
	tFixPoint r3, g3, b3;
#endif

	for ( s32 i = 0; i <= dx; i++ )
	{
#ifdef CMP_Z
		if ( line.z[0] < z[i] )
#endif
#ifdef CMP_W
		if ( line.w[0] < z[i] )
#endif
		{
			// zfail

			stencil[i] -= 1;
		}

#ifdef IPOL_Z
		line.z[0] += slopeZ;
#endif
#ifdef IPOL_W
		line.w[0] += slopeW;
#endif
#ifdef IPOL_C0
		line.c[0][0] += slopeC[0];
#endif
#ifdef IPOL_T0
		line.t[0][0] += slopeT[0];
#endif
#ifdef IPOL_T1
		line.t[1][0] += slopeT[1];
#endif
#ifdef IPOL_T2
		line.t[2][0] += slopeT[2];
#endif
#ifdef IPOL_L0
		line.l[0][0] += slopeL[0];
#endif
	}
}

/*!
*/
void CTRStencilShadow::fragment_zfail_incr()
{
	if (!Stencil)
		return;
	//tVideoSample *dst;


#ifdef USE_ZBUFFER
	fp24 *z;
#endif

#ifdef USE_SBUFFER
	u32 *stencil;
#endif

	s32 xStart;
	s32 xEnd;
	s32 dx;


#ifdef SUBTEXEL
	f32 subPixel;
#endif

#ifdef IPOL_Z
	f32 slopeZ;
#endif
#ifdef IPOL_W
	fp24 slopeW;
#endif
#ifdef IPOL_C0
	sVec4 slopeC[MATERIAL_MAX_COLORS];
#endif
#ifdef IPOL_T0
	sVec2 slopeT[BURNING_MATERIAL_MAX_TEXTURES];
#endif
#ifdef IPOL_L0
	sVec3 slopeL[BURNING_MATERIAL_MAX_TANGENT];
#endif

	// apply top-left fill-convention, left

	xStart = core::ceil32( line.x[0] );
	xEnd = core::ceil32( line.x[1] ) - 1;

	dx = xEnd - xStart;

	if ( dx < 0 )
		return;

	// slopes

	const f32 invDeltaX = core::reciprocal_approxim ( line.x[1] - line.x[0] );

#ifdef IPOL_Z
	slopeZ = (line.z[1] - line.z[0]) * invDeltaX;
#endif
#ifdef IPOL_W
	slopeW = (line.w[1] - line.w[0]) * invDeltaX;
#endif
#ifdef IPOL_C0
	slopeC[0] = (line.c[0][1] - line.c[0][0]) * invDeltaX;
#endif
#ifdef IPOL_T0
	slopeT[0] = (line.t[0][1] - line.t[0][0]) * invDeltaX;
#endif
#ifdef IPOL_T1
	slopeT[1] = (line.t[1][1] - line.t[1][0]) * invDeltaX;
#endif
#ifdef IPOL_T2
	slopeT[2] = (line.t[2][1] - line.t[2][0]) * invDeltaX;
#endif
#ifdef IPOL_L0
	slopeL[0] = (line.l[0][1] - line.l[0][0]) * invDeltaX;
#endif

#ifdef SUBTEXEL
	subPixel = ( (f32) xStart ) - line.x[0];
#ifdef IPOL_Z
	line.z[0] += slopeZ * subPixel;
#endif
#ifdef IPOL_W
	line.w[0] += slopeW * subPixel;
#endif
#ifdef IPOL_C0
	line.c[0][0] += slopeC[0] * subPixel;
#endif
#ifdef IPOL_T0
	line.t[0][0] += slopeT[0] * subPixel;
#endif
#ifdef IPOL_T1
	line.t[1][0] += slopeT[1] * subPixel;
#endif
#ifdef IPOL_T2
	line.t[2][0] += slopeT[2] * subPixel;
#endif
#ifdef IPOL_L0
	line.l[0][0] += slopeL[0] * subPixel;
#endif
#endif

	//dst = (tVideoSample*)RenderTarget->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;


#ifdef USE_ZBUFFER
	z = (fp24*) DepthBuffer->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;
#endif

#ifdef USE_SBUFFER
	stencil = (u32*) Stencil->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;
#endif

#ifdef INVERSE_W
	f32 inversew;
#endif

#ifdef IPOL_C0
	tFixPoint r3, g3, b3;
#endif

	for ( s32 i = 0; i <= dx; i++ )
	{
#ifdef CMP_Z
		if ( line.z[0] < z[i] )
#endif
#ifdef CMP_W
		if ( line.w[0] < z[i] )
#endif
		{
			// zfail

			stencil[i] += 1;
		}

#ifdef IPOL_Z
		line.z[0] += slopeZ;
#endif
#ifdef IPOL_W
		line.w[0] += slopeW;
#endif
#ifdef IPOL_C0
		line.c[0][0] += slopeC[0];
#endif
#ifdef IPOL_T0
		line.t[0][0] += slopeT[0];
#endif
#ifdef IPOL_T1
		line.t[1][0] += slopeT[1];
#endif
#ifdef IPOL_T2
		line.t[2][0] += slopeT[2];
#endif
#ifdef IPOL_L0
		line.l[0][0] += slopeL[0];
#endif
	}
}

void CTRStencilShadow::drawTriangle ( const s4DVertex *a,const s4DVertex *b,const s4DVertex *c )
{
	// sort on height, y

	if ( F32_A_GREATER_B ( a->Pos.y , b->Pos.y ) ) swapVertexPointer(&a, &b);
	if ( F32_A_GREATER_B ( b->Pos.y , c->Pos.y ) ) swapVertexPointer(&b, &c);
	if ( F32_A_GREATER_B ( a->Pos.y , b->Pos.y ) ) swapVertexPointer(&a, &b);

	const f32 ca = c->Pos.y - a->Pos.y;
	const f32 ba = b->Pos.y - a->Pos.y;
	const f32 cb = c->Pos.y - b->Pos.y;
	// calculate delta y of the edges

	scan.invDeltaY[0] = core::reciprocal( ca );
	scan.invDeltaY[1] = core::reciprocal( ba );
	scan.invDeltaY[2] = core::reciprocal( cb );

	if ( F32_LOWER_EQUAL_0 ( scan.invDeltaY[0] )  )
		return;

	// find if the major edge is left or right aligned

	f32 temp[4];

	temp[0] = a->Pos.x - c->Pos.x;
	temp[1] = -ca;
	temp[2] = b->Pos.x - a->Pos.x;
	temp[3] = ba;

	scan.left = ( temp[0] * temp[3] - temp[1] * temp[2] ) > 0.f ? 0 : 1;
	scan.right = 1 - scan.left;

	// calculate slopes for the major edge

	scan.slopeX[0] = (c->Pos.x - a->Pos.x) * scan.invDeltaY[0];
	scan.x[0] = a->Pos.x;

#ifdef IPOL_Z
	scan.slopeZ[0] = (c->Pos.z - a->Pos.z) * scan.invDeltaY[0];
	scan.z[0] = a->Pos.z;
#endif

#ifdef IPOL_W
	scan.slopeW[0] = (c->Pos.w - a->Pos.w) * scan.invDeltaY[0];
	scan.w[0] = a->Pos.w;
#endif

#ifdef IPOL_C0
	scan.slopeC[0][0] = (c->Color[0] - a->Color[0]) * scan.invDeltaY[0];
	scan.c[0][0] = a->Color[0];
#endif

#ifdef IPOL_T0
	scan.slopeT[0][0] = (c->Tex[0] - a->Tex[0]) * scan.invDeltaY[0];
	scan.t[0][0] = a->Tex[0];
#endif

#ifdef IPOL_T1
	scan.slopeT[1][0] = (c->Tex[1] - a->Tex[1]) * scan.invDeltaY[0];
	scan.t[1][0] = a->Tex[1];
#endif

#ifdef IPOL_T2
	scan.slopeT[2][0] = (c->Tex[2] - a->Tex[2]) * scan.invDeltaY[0];
	scan.t[2][0] = a->Tex[2];
#endif

#ifdef IPOL_L0
	scan.slopeL[0][0] = (c->LightTangent[0] - a->LightTangent[0]) * scan.invDeltaY[0];
	scan.l[0][0] = a->LightTangent[0];
#endif

	// top left fill convention y run

	s32 yStart;
	s32 yEnd;

#ifdef SUBTEXEL
	f32 subPixel;
#endif

	// rasterize upper sub-triangle

	//if ( (f32) 0.0 != scan.invDeltaY[1]  )

	if ( F32_GREATER_0 ( scan.invDeltaY[1] )  )
	{
		// calculate slopes for top edge

		scan.slopeX[1] = (b->Pos.x - a->Pos.x) * scan.invDeltaY[1];
		scan.x[1] = a->Pos.x;

#ifdef IPOL_Z
		scan.slopeZ[1] = (b->Pos.z - a->Pos.z) * scan.invDeltaY[1];
		scan.z[1] = a->Pos.z;
#endif

#ifdef IPOL_W
		scan.slopeW[1] = (b->Pos.w - a->Pos.w) * scan.invDeltaY[1];
		scan.w[1] = a->Pos.w;
#endif

#ifdef IPOL_C0
		scan.slopeC[0][1] = (b->Color[0] - a->Color[0]) * scan.invDeltaY[1];
		scan.c[0][1] = a->Color[0];
#endif

#ifdef IPOL_T0
		scan.slopeT[0][1] = (b->Tex[0] - a->Tex[0]) * scan.invDeltaY[1];
		scan.t[0][1] = a->Tex[0];
#endif

#ifdef IPOL_T1
		scan.slopeT[1][1] = (b->Tex[1] - a->Tex[1]) * scan.invDeltaY[1];
		scan.t[1][1] = a->Tex[1];
#endif

#ifdef IPOL_T2
		scan.slopeT[2][1] = (b->Tex[2] - a->Tex[2]) * scan.invDeltaY[1];
		scan.t[2][1] = a->Tex[2];
#endif

#ifdef IPOL_L0
		scan.slopeL[0][1] = (b->LightTangent[0] - a->LightTangent[0]) * scan.invDeltaY[1];
		scan.l[0][1] = a->LightTangent[0];
#endif

		// apply top-left fill convention, top part

		yStart = core::ceil32( a->Pos.y );
		yEnd = core::ceil32( b->Pos.y ) - 1;

#ifdef SUBTEXEL
		subPixel = ( (f32) yStart ) - a->Pos.y;

		// correct to pixel center

		scan.x[0] += scan.slopeX[0] * subPixel;
		scan.x[1] += scan.slopeX[1] * subPixel;		

#ifdef IPOL_Z
		scan.z[0] += scan.slopeZ[0] * subPixel;
		scan.z[1] += scan.slopeZ[1] * subPixel;		
#endif

#ifdef IPOL_W
		scan.w[0] += scan.slopeW[0] * subPixel;
		scan.w[1] += scan.slopeW[1] * subPixel;		
#endif

#ifdef IPOL_C0
		scan.c[0][0] += scan.slopeC[0][0] * subPixel;
		scan.c[0][1] += scan.slopeC[0][1] * subPixel;		
#endif

#ifdef IPOL_T0
		scan.t[0][0] += scan.slopeT[0][0] * subPixel;
		scan.t[0][1] += scan.slopeT[0][1] * subPixel;		
#endif

#ifdef IPOL_T1
		scan.t[1][0] += scan.slopeT[1][0] * subPixel;
		scan.t[1][1] += scan.slopeT[1][1] * subPixel;		
#endif

#ifdef IPOL_T2
		scan.t[2][0] += scan.slopeT[2][0] * subPixel;
		scan.t[2][1] += scan.slopeT[2][1] * subPixel;		
#endif

#ifdef IPOL_L0
		scan.l[0][0] += scan.slopeL[0][0] * subPixel;
		scan.l[0][1] += scan.slopeL[0][1] * subPixel;		
#endif

#endif

		// rasterize the edge scanlines

		for( line.y = yStart; line.y <= yEnd; ++line.y)
		{
			line.x[scan.left] = scan.x[0];
			line.x[scan.right] = scan.x[1];

#ifdef IPOL_Z
			line.z[scan.left] = scan.z[0];
			line.z[scan.right] = scan.z[1];
#endif

#ifdef IPOL_W
			line.w[scan.left] = scan.w[0];
			line.w[scan.right] = scan.w[1];
#endif

#ifdef IPOL_C0
			line.c[0][scan.left] = scan.c[0][0];
			line.c[0][scan.right] = scan.c[0][1];
#endif

#ifdef IPOL_T0
			line.t[0][scan.left] = scan.t[0][0];
			line.t[0][scan.right] = scan.t[0][1];
#endif

#ifdef IPOL_T1
			line.t[1][scan.left] = scan.t[1][0];
			line.t[1][scan.right] = scan.t[1][1];
#endif

#ifdef IPOL_T2
			line.t[2][scan.left] = scan.t[2][0];
			line.t[2][scan.right] = scan.t[2][1];
#endif

#ifdef IPOL_L0
			line.l[0][scan.left] = scan.l[0][0];
			line.l[0][scan.right] = scan.l[0][1];
#endif

			// render a scanline

			(this->*fragmentShader) ();

			scan.x[0] += scan.slopeX[0];
			scan.x[1] += scan.slopeX[1];

#ifdef IPOL_Z
			scan.z[0] += scan.slopeZ[0];
			scan.z[1] += scan.slopeZ[1];
#endif

#ifdef IPOL_W
			scan.w[0] += scan.slopeW[0];
			scan.w[1] += scan.slopeW[1];
#endif

#ifdef IPOL_C0
			scan.c[0][0] += scan.slopeC[0][0];
			scan.c[0][1] += scan.slopeC[0][1];
#endif

#ifdef IPOL_T0
			scan.t[0][0] += scan.slopeT[0][0];
			scan.t[0][1] += scan.slopeT[0][1];
#endif

#ifdef IPOL_T1
			scan.t[1][0] += scan.slopeT[1][0];
			scan.t[1][1] += scan.slopeT[1][1];
#endif

#ifdef IPOL_T2
			scan.t[2][0] += scan.slopeT[2][0];
			scan.t[2][1] += scan.slopeT[2][1];
#endif

#ifdef IPOL_L0
			scan.l[0][0] += scan.slopeL[0][0];
			scan.l[0][1] += scan.slopeL[0][1];
#endif

		}
	}

	// rasterize lower sub-triangle

	//if ( (f32) 0.0 != scan.invDeltaY[2] )

	if ( F32_GREATER_0 ( scan.invDeltaY[2] )  )
	{
		// advance to middle point

		//if( (f32) 0.0 != scan.invDeltaY[1] )

		if ( F32_GREATER_0 ( scan.invDeltaY[1] )  )
		{
			temp[0] = b->Pos.y - a->Pos.y;	// dy


			scan.x[0] = a->Pos.x + scan.slopeX[0] * temp[0];
#ifdef IPOL_Z
			scan.z[0] = a->Pos.z + scan.slopeZ[0] * temp[0];
#endif
#ifdef IPOL_W
			scan.w[0] = a->Pos.w + scan.slopeW[0] * temp[0];
#endif
#ifdef IPOL_C0
			scan.c[0][0] = a->Color[0] + scan.slopeC[0][0] * temp[0];
#endif
#ifdef IPOL_T0
			scan.t[0][0] = a->Tex[0] + scan.slopeT[0][0] * temp[0];
#endif
#ifdef IPOL_T1
			scan.t[1][0] = a->Tex[1] + scan.slopeT[1][0] * temp[0];
#endif
#ifdef IPOL_T2
			scan.t[2][0] = a->Tex[2] + scan.slopeT[2][0] * temp[0];
#endif
#ifdef IPOL_L0
			scan.l[0][0] = a->LightTangent[0] + scan.slopeL[0][0] * temp[0];
#endif

		}

		// calculate slopes for bottom edge

		scan.slopeX[1] = (c->Pos.x - b->Pos.x) * scan.invDeltaY[2];
		scan.x[1] = b->Pos.x;

#ifdef IPOL_Z
		scan.slopeZ[1] = (c->Pos.z - b->Pos.z) * scan.invDeltaY[2];
		scan.z[1] = b->Pos.z;
#endif

#ifdef IPOL_W
		scan.slopeW[1] = (c->Pos.w - b->Pos.w) * scan.invDeltaY[2];
		scan.w[1] = b->Pos.w;
#endif

#ifdef IPOL_C0
		scan.slopeC[0][1] = (c->Color[0] - b->Color[0]) * scan.invDeltaY[2];
		scan.c[0][1] = b->Color[0];
#endif

#ifdef IPOL_T0
		scan.slopeT[0][1] = (c->Tex[0] - b->Tex[0]) * scan.invDeltaY[2];
		scan.t[0][1] = b->Tex[0];
#endif

#ifdef IPOL_T1
		scan.slopeT[1][1] = (c->Tex[1] - b->Tex[1]) * scan.invDeltaY[2];
		scan.t[1][1] = b->Tex[1];
#endif

#ifdef IPOL_T2
		scan.slopeT[2][1] = (c->Tex[2] - b->Tex[2]) * scan.invDeltaY[2];
		scan.t[2][1] = b->Tex[2];
#endif

#ifdef IPOL_L0
		scan.slopeL[0][1] = (c->LightTangent[0] - b->LightTangent[0]) * scan.invDeltaY[2];
		scan.l[0][1] = b->LightTangent[0];
#endif

		// apply top-left fill convention, top part

		yStart = core::ceil32( b->Pos.y );
		yEnd = core::ceil32( c->Pos.y ) - 1;

#ifdef SUBTEXEL

		subPixel = ( (f32) yStart ) - b->Pos.y;

		// correct to pixel center

		scan.x[0] += scan.slopeX[0] * subPixel;
		scan.x[1] += scan.slopeX[1] * subPixel;		

#ifdef IPOL_Z
		scan.z[0] += scan.slopeZ[0] * subPixel;
		scan.z[1] += scan.slopeZ[1] * subPixel;		
#endif

#ifdef IPOL_W
		scan.w[0] += scan.slopeW[0] * subPixel;
		scan.w[1] += scan.slopeW[1] * subPixel;		
#endif

#ifdef IPOL_C0
		scan.c[0][0] += scan.slopeC[0][0] * subPixel;
		scan.c[0][1] += scan.slopeC[0][1] * subPixel;		
#endif

#ifdef IPOL_T0
		scan.t[0][0] += scan.slopeT[0][0] * subPixel;
		scan.t[0][1] += scan.slopeT[0][1] * subPixel;		
#endif

#ifdef IPOL_T1
		scan.t[1][0] += scan.slopeT[1][0] * subPixel;
		scan.t[1][1] += scan.slopeT[1][1] * subPixel;		
#endif

#ifdef IPOL_T2
		scan.t[2][0] += scan.slopeT[2][0] * subPixel;
		scan.t[2][1] += scan.slopeT[2][1] * subPixel;		
#endif

#ifdef IPOL_L0
		scan.l[0][0] += scan.slopeL[0][0] * subPixel;
		scan.l[0][1] += scan.slopeL[0][1] * subPixel;		
#endif

#endif

		// rasterize the edge scanlines

		for( line.y = yStart; line.y <= yEnd; ++line.y)
		{
			line.x[scan.left] = scan.x[0];
			line.x[scan.right] = scan.x[1];

#ifdef IPOL_Z
			line.z[scan.left] = scan.z[0];
			line.z[scan.right] = scan.z[1];
#endif

#ifdef IPOL_W
			line.w[scan.left] = scan.w[0];
			line.w[scan.right] = scan.w[1];
#endif

#ifdef IPOL_C0
			line.c[0][scan.left] = scan.c[0][0];
			line.c[0][scan.right] = scan.c[0][1];
#endif

#ifdef IPOL_T0
			line.t[0][scan.left] = scan.t[0][0];
			line.t[0][scan.right] = scan.t[0][1];
#endif

#ifdef IPOL_T1
			line.t[1][scan.left] = scan.t[1][0];
			line.t[1][scan.right] = scan.t[1][1];
#endif

#ifdef IPOL_T2
			line.t[2][scan.left] = scan.t[2][0];
			line.t[2][scan.right] = scan.t[2][1];
#endif

#ifdef IPOL_L0
			line.l[0][scan.left] = scan.l[0][0];
			line.l[0][scan.right] = scan.l[0][1];
#endif

			// render a scanline

			(this->*fragmentShader) ();

			scan.x[0] += scan.slopeX[0];
			scan.x[1] += scan.slopeX[1];

#ifdef IPOL_Z
			scan.z[0] += scan.slopeZ[0];
			scan.z[1] += scan.slopeZ[1];
#endif

#ifdef IPOL_W
			scan.w[0] += scan.slopeW[0];
			scan.w[1] += scan.slopeW[1];
#endif

#ifdef IPOL_C0
			scan.c[0][0] += scan.slopeC[0][0];
			scan.c[0][1] += scan.slopeC[0][1];
#endif

#ifdef IPOL_T0
			scan.t[0][0] += scan.slopeT[0][0];
			scan.t[0][1] += scan.slopeT[0][1];
#endif

#ifdef IPOL_T1
			scan.t[1][0] += scan.slopeT[1][0];
			scan.t[1][1] += scan.slopeT[1][1];
#endif
#ifdef IPOL_T2
			scan.t[2][0] += scan.slopeT[2][0];
			scan.t[2][1] += scan.slopeT[2][1];
#endif

#ifdef IPOL_L0
			scan.l[0][0] += scan.slopeL[0][0];
			scan.l[0][1] += scan.slopeL[0][1];
#endif

		}
	}

}


} // end namespace video

} // end namespace irr


#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_


namespace irr
{
namespace video
{


//! creates a triangle renderer

IBurningShader* createTRStencilShadow(CBurningVideoDriver* driver)
{
	#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_
	return new CTRStencilShadow(driver);
	#else
	return 0;
	#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_

}


} // end namespace video

} // end namespace irr