// Copyright (C) 2002-2012 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"
#include "CSoftwareDriver2.h"

#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_

// compile flag for this file
#undef USE_ZBUFFER
#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_C1
#undef IPOL_C2
#undef IPOL_C3
#undef IPOL_T0
#undef IPOL_T1
#undef IPOL_T2
#undef IPOL_L0

// define render case
#define SUBTEXEL
#define INVERSE_W

#define USE_ZBUFFER
#define IPOL_W
#define CMP_W
#define WRITE_W

#define IPOL_C0
#define IPOL_C1
#define IPOL_C2
#define IPOL_C3
#define IPOL_T0
#define IPOL_T1
//#define IPOL_L0

// apply global override
#ifndef SOFTWARE_DRIVER_2_PERSPECTIVE_CORRECT
#undef INVERSE_W
#endif

#ifndef SOFTWARE_DRIVER_2_SUBTEXEL
#undef SUBTEXEL
#endif

#if BURNING_MATERIAL_MAX_COLORS < 1
#undef IPOL_C0
#endif

#if BURNING_MATERIAL_MAX_COLORS < 2
#undef IPOL_C1
#endif

#if BURNING_MATERIAL_MAX_LIGHT_TANGENT < 1
#undef IPOL_L0
#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


burning_namespace_start


class CTRNormalMap : public IBurningShader
{
public:

	//! constructor
	CTRNormalMap(CBurningVideoDriver* driver,s32& outMaterialTypeNr, E_MATERIAL_TYPE baseMaterial);
	~CTRNormalMap();

	//! draws an indexed triangle list
	virtual void drawTriangle(const s4DVertex* burning_restrict a, const s4DVertex* burning_restrict b, const s4DVertex* burning_restrict c) IRR_OVERRIDE;
	virtual void OnSetMaterial(const SBurningShaderMaterial& material) IRR_OVERRIDE;
	virtual void OnSetConstants(IMaterialRendererServices* services, s32 userData) IRR_OVERRIDE;
private:
	void fragmentShader();

};


//! constructor
CTRNormalMap::CTRNormalMap(CBurningVideoDriver* driver, s32& outMaterialTypeNr, E_MATERIAL_TYPE baseMaterial)
	: IBurningShader(driver, baseMaterial)
{
#ifdef _DEBUG
	setDebugName("CTRNormalMap");
#endif
	CallBack = this;
	outMaterialTypeNr = driver->addMaterialRenderer(this);
}

CTRNormalMap::~CTRNormalMap()
{
	if (CallBack == this)
		CallBack = 0;
}

void CTRNormalMap::OnSetMaterial(const SBurningShaderMaterial& material)
{
}

/*!
*/
void CTRNormalMap::fragmentShader()
{
	tVideoSample* dst;

#ifdef USE_ZBUFFER
	fp24* z;
#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[BURNING_MATERIAL_MAX_COLORS];
#endif
#ifdef IPOL_T0
	sVec2 slopeT[BURNING_MATERIAL_MAX_TEXTURES];
#endif
#ifdef IPOL_L0
	sVec3Pack_unpack slopeL[BURNING_MATERIAL_MAX_LIGHT_TANGENT];
#endif

	// apply top-left fill-convention, left
	xStart = fill_convention_left(line.x[0]);
	xEnd = fill_convention_right(line.x[1]);

	dx = xEnd - xStart;

	if (dx < 0)
		return;

	// slopes
	const f32 invDeltaX = fill_step_x(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_C1
	slopeC[1] = (line.c[1][1] - line.c[1][0]) * invDeltaX;
#endif
#ifdef IPOL_C2
	slopeC[2] = (line.c[2][1] - line.c[2][0]) * invDeltaX;
#endif
#ifdef IPOL_C3
	slopeC[3] = (line.c[3][1] - line.c[3][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_C1
	line.c[1][0] += slopeC[1] * subPixel;
#endif
#ifdef IPOL_C2
	line.c[2][0] += slopeC[2] * subPixel;
#endif
#ifdef IPOL_C3
	line.c[3][0] += slopeC[3] * 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

	SOFTWARE_DRIVER_2_CLIPCHECK;
	dst = (tVideoSample*)RenderTarget->getData() + (line.y * RenderTarget->getDimension().Width) + xStart;

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


	f32 inversew = FIX_POINT_F32_MUL;

	tFixPoint tx0, ty0;

#ifdef IPOL_T1
	tFixPoint tx1, ty1;
#endif

	tFixPoint r0, g0, b0;
	tFixPoint r1, g1, b1;
	tFixPoint r2, g2, b2;

#ifdef IPOL_L0
	tFixPoint lx, ly, lz;
#endif
	tFixPoint ndotl = FIX_POINT_ONE;


#ifdef IPOL_C0
	tFixPoint a3, r3, g3, b3;
#endif

#ifdef IPOL_C1
	tFixPoint aFog = FIX_POINT_ONE;
#endif

#ifdef IPOL_C2
	tFixPoint lx, ly, lz;
#endif	


	for (s32 i = 0; i <= dx; i += SOFTWARE_DRIVER_2_STEP_X)
	{
#ifdef CMP_Z
		if (line.z[0] < z[i])
#endif
#ifdef CMP_W
			if (line.w[0] >= z[i])
#endif
			{
#ifdef INVERSE_W
				inversew = fix_inverse32(line.w[0]);
#endif

#ifdef IPOL_C0
				//vertex alpha blend ( and omit depthwrite ,hacky..)
				a3 = tofix(line.c[0][0].a, inversew);
				if (a3 + 2 >= FIX_POINT_ONE)
				{
#ifdef WRITE_Z
					z[i] = line.z[0];
#endif
#ifdef WRITE_W
					z[i] = line.w[0];
#endif
				}
#endif

#ifdef IPOL_C1
				//complete inside fog
				if (TL_Flag & TL_FOG)
				{
					aFog = tofix(line.c[1][0].a, inversew);
					if (aFog <= 0)
					{
						dst[i] = fog_color_sample;
						continue;
					}
				}
#endif

				tx0 = tofix(line.t[0][0].x, inversew);
				ty0 = tofix(line.t[0][0].y, inversew);
				tx1 = tofix(line.t[1][0].x, inversew);
				ty1 = tofix(line.t[1][0].y, inversew);

				// diffuse map
				getSample_texture(r0, g0, b0, &IT[0], tx0, ty0);

				// normal map ( same texcoord0 but different mipmapping)
				getSample_texture(r1, g1, b1, &IT[1], tx1, ty1);

				// normal: xyz * 2 - 1
				r1 = (r1 - FIX_POINT_HALF_COLOR) >> (COLOR_MAX_LOG2 - 1);
				g1 = (g1 - FIX_POINT_HALF_COLOR) >> (COLOR_MAX_LOG2 - 1);
				b1 = (b1 - FIX_POINT_HALF_COLOR) >> (COLOR_MAX_LOG2 - 1);


				//lightvector
#ifdef IPOL_L0
				lx = tofix(line.l[0][0].x, inversew);
				ly = tofix(line.l[0][0].y, inversew);
				lz = tofix(line.l[0][0].z, inversew);

				// DOT 3 Normal Map light in tangent space
				//max(dot(LightVector, Normal), 0.0);
				ndotl = clampfix_mincolor((imulFix_simple(r1, lx) + imulFix_simple(g1, ly) + imulFix_simple(b1, lz)));
#endif
				lx = tofix(line.c[2][0].x, inversew);
				ly = tofix(line.c[2][0].y, inversew);
				lz = tofix(line.c[2][0].z, inversew);
				//omit normalize
				ndotl = clampfix_mincolor((imulFix_simple(r1, lx) + imulFix_simple(g1, ly) + imulFix_simple(b1, lz)));

#ifdef IPOL_C0

				//LightColor[0] * lambert
				r3 = imulFix_simple(tofix(line.c[0][0].r, inversew), ndotl);
				g3 = imulFix_simple(tofix(line.c[0][0].g, inversew), ndotl);
				b3 = imulFix_simple(tofix(line.c[0][0].b, inversew), ndotl);

				//lightvector1
				lx = tofix(line.c[3][0].x, inversew);
				ly = tofix(line.c[3][0].y, inversew);
				lz = tofix(line.c[3][0].z, inversew);
				//omit normalize
				ndotl = clampfix_mincolor((imulFix_simple(r1, lx) + imulFix_simple(g1, ly) + imulFix_simple(b1, lz)));

				//LightColor[1] * lambert
				r3 += imulFix_simple(tofix(line.c[1][0].r, inversew), ndotl);
				g3 += imulFix_simple(tofix(line.c[1][0].g, inversew), ndotl);
				b3 += imulFix_simple(tofix(line.c[1][0].b, inversew), ndotl);

				// (Lambert0 * LightColor[0] + Lambert1 * LightColor[1]) *  Diffuse Texture;
				r2 = clampfix_maxcolor(imulFix_simple(r3, r0));
				g2 = clampfix_maxcolor(imulFix_simple(g3, g0));
				b2 = clampfix_maxcolor(imulFix_simple(b3, b0));

				//vertex alpha blend ( and omit depthwrite ,hacky..)
				if (a3 + 2 < FIX_POINT_ONE)
				{
					color_to_fix(r1, g1, b1, dst[i]);
					r2 = r1 + imulFix(a3, r2 - r1);
					g2 = g1 + imulFix(a3, g2 - g1);
					b2 = b1 + imulFix(a3, b2 - b1);
				}

#ifdef IPOL_C1
				//mix with distance
				if (aFog < FIX_POINT_ONE) //TL_Flag & TL_FOG)
				{
					r2 = fog_color[1] + imulFix(aFog, r2 - fog_color[1]);
					g2 = fog_color[2] + imulFix(aFog, g2 - fog_color[2]);
					b2 = fog_color[3] + imulFix(aFog, b2 - fog_color[3]);
				}
#endif
				dst[i] = fix_to_sample(r2, g2, b2);


#else
				r2 = imulFix_tex4(r0, r1);
				g2 = imulFix_tex4(g0, g1);
				b2 = imulFix_tex4(b0, b1);
				dst[i] = fix_to_sample(r2, g2, b2);
#endif

			}

#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_C1
		line.c[1][0] += slopeC[1];
#endif
#ifdef IPOL_C2
		line.c[2][0] += slopeC[2];
#endif
#ifdef IPOL_C3
		line.c[3][0] += slopeC[3];
#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 CTRNormalMap::drawTriangle(const s4DVertex* burning_restrict a, const s4DVertex* burning_restrict b, const s4DVertex* burning_restrict 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] = fill_step_y(ca);
	scan.invDeltaY[1] = fill_step_y(ba);
	scan.invDeltaY[2] = fill_step_y(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 ? 1 : 0;
	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_C1
	scan.slopeC[1][0] = (c->Color[1] - a->Color[1]) * scan.invDeltaY[0];
	scan.c[1][0] = a->Color[1];
#endif

#ifdef IPOL_C2
	scan.slopeC[2][0] = (c->Color[2] - a->Color[2]) * scan.invDeltaY[0];
	scan.c[2][0] = a->Color[2];
#endif

#ifdef IPOL_C3
	scan.slopeC[3][0] = (c->Color[3] - a->Color[3]) * scan.invDeltaY[0];
	scan.c[3][0] = a->Color[3];
#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_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_C1
		scan.slopeC[1][1] = (b->Color[1] - a->Color[1]) * scan.invDeltaY[1];
		scan.c[1][1] = a->Color[1];
#endif

#ifdef IPOL_C2
		scan.slopeC[2][1] = (b->Color[2] - a->Color[2]) * scan.invDeltaY[1];
		scan.c[2][1] = a->Color[2];
#endif

#ifdef IPOL_C3
		scan.slopeC[3][1] = (b->Color[3] - a->Color[3]) * scan.invDeltaY[1];
		scan.c[3][1] = a->Color[3];
#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 = fill_convention_top(a->Pos.y);
		yEnd = fill_convention_down(b->Pos.y);

#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_C1
		scan.c[1][0] += scan.slopeC[1][0] * subPixel;
		scan.c[1][1] += scan.slopeC[1][1] * subPixel;
#endif

#ifdef IPOL_C2
		scan.c[2][0] += scan.slopeC[2][0] * subPixel;
		scan.c[2][1] += scan.slopeC[2][1] * subPixel;
#endif

#ifdef IPOL_C3
		scan.c[3][0] += scan.slopeC[3][0] * subPixel;
		scan.c[3][1] += scan.slopeC[3][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 += SOFTWARE_DRIVER_2_STEP_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_C1
			line.c[1][scan.left] = scan.c[1][0];
			line.c[1][scan.right] = scan.c[1][1];
#endif

#ifdef IPOL_C2
			line.c[2][scan.left] = scan.c[2][0];
			line.c[2][scan.right] = scan.c[2][1];
#endif

#ifdef IPOL_C3
			line.c[3][scan.left] = scan.c[3][0];
			line.c[3][scan.right] = scan.c[3][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
			if_interlace_scanline 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_C1
			scan.c[1][0] += scan.slopeC[1][0];
			scan.c[1][1] += scan.slopeC[1][1];
#endif

#ifdef IPOL_C2
			scan.c[2][0] += scan.slopeC[2][0];
			scan.c[2][1] += scan.slopeC[2][1];
#endif

#ifdef IPOL_C3
			scan.c[3][0] += scan.slopeC[3][0];
			scan.c[3][1] += scan.slopeC[3][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_GREATER_0(scan.invDeltaY[2]))
	{
		// advance to middle point
		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_C1
			scan.c[1][0] = a->Color[1] + scan.slopeC[1][0] * temp[0];
#endif
#ifdef IPOL_C2
			scan.c[2][0] = a->Color[2] + scan.slopeC[2][0] * temp[0];
#endif
#ifdef IPOL_C3
			scan.c[3][0] = a->Color[3] + scan.slopeC[3][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] = sVec3Pack_unpack(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_C1
		scan.slopeC[1][1] = (c->Color[1] - b->Color[1]) * scan.invDeltaY[2];
		scan.c[1][1] = b->Color[1];
#endif

#ifdef IPOL_C2
		scan.slopeC[2][1] = (c->Color[2] - b->Color[2]) * scan.invDeltaY[2];
		scan.c[2][1] = b->Color[2];
#endif

#ifdef IPOL_C3
		scan.slopeC[3][1] = (c->Color[3] - b->Color[3]) * scan.invDeltaY[2];
		scan.c[3][1] = b->Color[3];
#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 = fill_convention_top(b->Pos.y);
		yEnd = fill_convention_down(c->Pos.y);

#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_C1
		scan.c[1][0] += scan.slopeC[1][0] * subPixel;
		scan.c[1][1] += scan.slopeC[1][1] * subPixel;
#endif

#ifdef IPOL_C2
		scan.c[2][0] += scan.slopeC[2][0] * subPixel;
		scan.c[2][1] += scan.slopeC[2][1] * subPixel;
#endif

#ifdef IPOL_C3
		scan.c[3][0] += scan.slopeC[3][0] * subPixel;
		scan.c[3][1] += scan.slopeC[3][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 += SOFTWARE_DRIVER_2_STEP_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_C1
			line.c[1][scan.left] = scan.c[1][0];
			line.c[1][scan.right] = scan.c[1][1];
#endif

#ifdef IPOL_C2
			line.c[2][scan.left] = scan.c[2][0];
			line.c[2][scan.right] = scan.c[2][1];
#endif

#ifdef IPOL_C3
			line.c[3][scan.left] = scan.c[3][0];
			line.c[3][scan.right] = scan.c[3][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
			if_interlace_scanline 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_C1
			scan.c[1][0] += scan.slopeC[1][0];
			scan.c[1][1] += scan.slopeC[1][1];
#endif

#ifdef IPOL_C2
			scan.c[2][0] += scan.slopeC[2][0];
			scan.c[2][1] += scan.slopeC[2][1];
#endif

#ifdef IPOL_C3
			scan.c[3][0] += scan.slopeC[3][0];
			scan.c[3][1] += scan.slopeC[3][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

		}
}

}

//! Called by the engine when the vertex and/or pixel shader constants for an
//! material renderer should be set.
void CTRNormalMap::OnSetConstants(IMaterialRendererServices* services, s32 userData)
{
#if 0
	video::IVideoDriver* driver = services->getVideoDriver();

	// set transposed world matrix
	const core::matrix4& tWorld = driver->getTransform(video::ETS_WORLD).getTransposed();
	services->setVertexShaderConstant(tWorld.pointer(), 0, 4);

	// set transposed worldViewProj matrix
	core::matrix4 worldViewProj(driver->getTransform(video::ETS_PROJECTION));
	worldViewProj *= driver->getTransform(video::ETS_VIEW);
	worldViewProj *= driver->getTransform(video::ETS_WORLD);
	core::matrix4 tr(worldViewProj.getTransposed());
	services->setVertexShaderConstant(tr.pointer(), 8, 4);

	// here we fetch the fixed function lights from the driver
	// and set them as constants

	u32 cnt = driver->getDynamicLightCount();

	// Load the inverse world matrix.
	core::matrix4 invWorldMat;
	driver->getTransform(video::ETS_WORLD).getInverse(invWorldMat);

	for (u32 i = 0; i < 2; ++i)
	{
		video::SLight light;

		if (i < cnt)
			light = driver->getDynamicLight(i);
		else
		{
			light.DiffuseColor.set(0, 0, 0); // make light dark
			light.Radius = 1.0f;
		}

		light.DiffuseColor.a = 1.0f / (light.Radius * light.Radius); // set attenuation

		// Transform the light by the inverse world matrix to get it into object space.
		invWorldMat.transformVect(light.Position);

		services->setVertexShaderConstant(
			reinterpret_cast<const f32*>(&light.Position), 12 + (i * 2), 1);

		services->setVertexShaderConstant(
			reinterpret_cast<const f32*>(&light.DiffuseColor), 13 + (i * 2), 1);
	}
#endif
}
burning_namespace_end

#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_

burning_namespace_start

//! creates a triangle renderer
IBurningShader* createTRNormalMap(CBurningVideoDriver* driver, s32& outMaterialTypeNr, E_MATERIAL_TYPE baseMaterial)
{
#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_
	return new CTRNormalMap(driver, outMaterialTypeNr,baseMaterial);
#else
	return 0;
#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_
}

burning_namespace_end