// 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"

#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_T0
#undef IPOL_T1

// 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_T0
//#define IPOL_T1

// 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 !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 CTRTextureWire2 : public IBurningShader
{
public:

	//! constructor
	CTRTextureWire2(CBurningVideoDriver* driver);

	virtual void OnSetMaterial(const SBurningShaderMaterial& material) IRR_OVERRIDE;

	//! 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 drawLine(const s4DVertex* a, const s4DVertex* b) IRR_OVERRIDE;
	virtual void drawPoint(const s4DVertex* a) IRR_OVERRIDE;
	virtual bool canWireFrame() IRR_OVERRIDE { return true; }
	virtual bool canPointCloud() IRR_OVERRIDE { return true; }

protected:

	void renderLine(const s4DVertex* a, const s4DVertex* b) const;

	int renderZero;
	int depth_pass;
	int depth_write;
};

//! constructor
CTRTextureWire2::CTRTextureWire2(CBurningVideoDriver* driver)
	: IBurningShader(driver, EMT_SOLID)
{
#ifdef _DEBUG
	setDebugName("CTRTextureWire2");
#endif
	renderZero = 0;
	depth_pass = 1;
	depth_write = 0;
}

void CTRTextureWire2::OnSetMaterial(const SBurningShaderMaterial& material)
{
	depth_pass = material.depth_test == 0;
	depth_write = material.depth_write;
}


/*!
	2d line
*/
void CTRTextureWire2::renderLine(const s4DVertex* a, const s4DVertex* b) const
{
	const int pitch0 = RenderTarget->getDimension().Width << SOFTWARE_DRIVER_2_RENDERTARGET_GRANULARITY;
#ifdef USE_ZBUFFER
	const int pitch1 = RenderTarget->getDimension().Width * sizeof(fp24);
#endif

	//todo: fill_convention_none!
	int aposx = fill_convention_none(a->Pos.x);
	int aposy = fill_convention_none(a->Pos.y);
	int bposx = fill_convention_none(b->Pos.x);
	int bposy = fill_convention_none(b->Pos.y);

	int dx = bposx - aposx;
	int dy = bposy - aposy;

	int c;
	int m;
	int d = 0;
	int run;

	tVideoSample* dst;
#ifdef USE_ZBUFFER
	fp24* z;
#endif

	int xInc0 = 1 << SOFTWARE_DRIVER_2_RENDERTARGET_GRANULARITY;
	int yInc0 = pitch0;

#ifdef USE_ZBUFFER
	int xInc1 = sizeof(fp24);
	int yInc1 = pitch1;
#endif

	if (dx < 0)
	{
		xInc0 = -xInc0;
#ifdef USE_ZBUFFER
		xInc1 = -4;
#endif
		dx = -dx;
	}

	if (dy > dx)
	{
		//swap
		s32 t;
		t = dx; dx = dy; dy = t;
		t = xInc0; xInc0 = yInc0; yInc0 = t;
#ifdef USE_ZBUFFER
		t = xInc1; xInc1 = yInc1; yInc1 = t;
#endif
	}

	if (0 == dx)
	{
		if (!renderZero) return;
		dx = 1;
	}

	SOFTWARE_DRIVER_2_CLIPCHECK_WIRE;
	dst = (tVideoSample*)((u8*)RenderTarget->getData() + (aposy * pitch0) + (aposx << SOFTWARE_DRIVER_2_RENDERTARGET_GRANULARITY));

#ifdef USE_ZBUFFER
	z = (fp24*)((u8*)DepthBuffer->lock() + (aposy * pitch1) + (aposx << 2));
#endif

	c = dx << 1;
	m = dy << 1;

	// slopes
	const f32 invDeltaX = fill_step_x((f32)dx);

#ifdef IPOL_Z
	f32 slopeZ = (b->Pos.z - a->Pos.z) * invDeltaX;
	f32 dataZ = a->Pos.z;
#endif

#ifdef IPOL_W
	fp24 slopeW = (b->Pos.w - a->Pos.w) * invDeltaX;
	fp24 dataW = a->Pos.w;
#endif

	f32 inversew = FIX_POINT_F32_MUL;

	tVideoSample color;
#if BURNING_MATERIAL_MAX_COLORS > 0
	tFixPoint r0, g0, b0;
#ifdef IPOL_C0
	sVec4 slopeC;
	sVec4 C;
	slopeC = (b->Color[0] - a->Color[0]) * invDeltaX;
	C = a->Color[0];
#endif

#ifdef INVERSE_W
	inversew = fix_inverse32_color(dataW);
#endif

	vec4_to_fix(r0, g0, b0, a->Color[0], inversew);
	color = fix_to_sample(r0, g0, b0);

#else
	color = (tVideoSample)0xFFFFFFFF;
#endif


	run = dx;
	while (run)
	{
#ifdef CMP_Z
		if (*z >= dataZ)
#endif
#ifdef CMP_W
		if (depth_pass || dataW >= *z)
#endif
		{
#ifdef WRITE_Z
			*z = dataZ;
#endif
#ifdef WRITE_W
			if (depth_write) *z = dataW;
#endif

#ifdef IPOL_C0
#ifdef INVERSE_W
			inversew = fix_inverse32_color(dataW);
#endif
			vec4_to_fix(r0, g0, b0, C, inversew);
			color = fix_to_sample(r0, g0, b0);
#endif
			* dst = color;

		}

		dst = (tVideoSample*)((u8*)dst + xInc0);	// x += xInc
#ifdef CMP_Z
		z = (fp24*)((u8*)z + xInc1);
#endif
#ifdef CMP_W
		z = (fp24*)((u8*)z + xInc1);
#endif

		d += m;
		if (d > dx)
		{
			dst = (tVideoSample*)((u8*)dst + yInc0);	// y += yInc
#ifdef CMP_Z
			z = (fp24*)((u8*)z + yInc1);
#endif
#ifdef CMP_W
			z = (fp24*)((u8*)z + yInc1);
#endif

			d -= c;
		}
		run -= 1;
#ifdef IPOL_Z
		dataZ += slopeZ;
#endif
#ifdef IPOL_W
		dataW += slopeW;
#endif
#ifdef IPOL_C0
		C += slopeC;
#endif

	}

}

void CTRTextureWire2::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);

	renderLine(a, b);
	renderLine(b, c);
	renderLine(a, c);

}


void CTRTextureWire2::drawLine(const s4DVertex* a, const s4DVertex* b)
{
	// query access to TexMaps

	// sort on height, y
	if (F32_A_GREATER_B(a->Pos.y, b->Pos.y)) swapVertexPointer(&a, &b);

	renderLine(a, b);
}

void CTRTextureWire2::drawPoint(const s4DVertex* a)
{
	if ((a->flag & VERTEX4D_CLIPMASK) == VERTEX4D_INSIDE)
	{
		renderZero = 1;
		renderLine(a, a);
		renderZero = 0;
	}
}

burning_namespace_end

#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_

burning_namespace_start

//! creates a flat triangle renderer
IBurningShader* createTriangleRendererTextureGouraudWire2(CBurningVideoDriver* driver)
{
	//ETR_TEXTURE_GOURAUD_WIRE
#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_
	return new CTRTextureWire2(driver);
#else
	return 0;
#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_
}


burning_namespace_end