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irrlicht/source/Irrlicht/CTRStencilShadow.cpp
cutealien 20b3d56987 Merging r6075 through r6106 from trunk to ogl-es branch. 
Burnings renderer changes.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6116 dfc29bdd-3216-0410-991c-e03cc46cb475
2020-06-12 20:41:49 +00:00

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// 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 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
#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
namespace irr
{
namespace video
{
class CTRStencilShadow : public IBurningShader
{
public:
//! constructor
CTRStencilShadow(CBurningVideoDriver* driver);
//! 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_;
private:
void fragmentShader();
};
//! constructor
CTRStencilShadow::CTRStencilShadow(CBurningVideoDriver* driver)
: IBurningShader(driver)
{
#ifdef _DEBUG
setDebugName("CTRStencilShadow");
#endif
}
/*!
*/
void CTRStencilShadow::fragmentShader()
{
#ifdef USE_ZBUFFER
fp24 *z;
#endif
#ifdef USE_SBUFFER
tStencilSample *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
// 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;
SOFTWARE_DRIVER_2_CLIPCHECK;
// slopes
const f32 invDeltaX = reciprocal_zero2( 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 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
#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
#ifdef USE_SBUFFER
stencil = (tStencilSample*) Stencil->lock() + ( line.y * RenderTarget->getDimension().Width ) + xStart;
#endif
#ifdef INVERSE_W
f32 inversew = FIX_POINT_F32_MUL;
#endif
s32 i;
for (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
{
// zpass
switch (stencilOp[2])
{
case StencilOp_INCR: stencil[i] += 1; break;
case StencilOp_DECR: stencil[i] -= 1; break;// core::s32_max(0, stencil[i] - 1); break;
default:
case StencilOp_KEEP: break;
}
}
else
{
// zfail
switch (stencilOp[1])
{
case StencilOp_INCR: stencil[i] += 1; break;
case StencilOp_DECR: stencil[i] -= 1; break;// core::s32_max(0, stencil[i] - 1); break;
default:
case StencilOp_KEEP: break;
}
}
#ifdef IPOL_Z
line.z[0] += slopeZ;
#endif
#ifdef IPOL_W
line.w[0] += slopeW;
#endif
}
}
void CTRStencilShadow::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] = reciprocal_zero( ca );
scan.invDeltaY[1] = reciprocal_zero( ba );
scan.invDeltaY[2] = reciprocal_zero( 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_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 = fill_convention_left( a->Pos.y );
yEnd = fill_convention_right( 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_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
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 = fill_convention_left( b->Pos.y );
yEnd = fill_convention_right( 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_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
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)
{
//ETR_STENCIL_SHADOW
#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_
return new CTRStencilShadow(driver);
#else
return 0;
#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_
}
} // end namespace video
} // end namespace irr
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