673 lines
13 KiB
C++
673 lines
13 KiB
C++
// Copyright (C) 2002-2007 Nikolaus Gebhardt / Thomas Alten
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "IrrCompileConfig.h"
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#include "IBurningShader.h"
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#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_
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// compile flag for this file
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#undef USE_ZBUFFER
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#undef IPOL_Z
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#undef CMP_Z
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#undef WRITE_Z
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#undef IPOL_W
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#undef CMP_W
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#undef WRITE_W
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#undef SUBTEXEL
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#undef INVERSE_W
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#undef IPOL_C0
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#undef IPOL_T0
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#undef IPOL_T1
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// define render case
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#define SUBTEXEL
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#define INVERSE_W
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#define USE_ZBUFFER
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#define IPOL_W
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#define CMP_W
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#define WRITE_W
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#define IPOL_C0
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//#define IPOL_T0
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//#define IPOL_T1
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// apply global override
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#ifndef SOFTWARE_DRIVER_2_PERSPECTIVE_CORRECT
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#undef INVERSE_W
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#endif
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#ifndef SOFTWARE_DRIVER_2_SUBTEXEL
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#undef SUBTEXEL
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#endif
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#ifndef SOFTWARE_DRIVER_2_USE_VERTEX_COLOR
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#undef IPOL_C0
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#endif
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#if !defined ( SOFTWARE_DRIVER_2_USE_WBUFFER ) && defined ( USE_ZBUFFER )
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#ifndef SOFTWARE_DRIVER_2_PERSPECTIVE_CORRECT
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#undef IPOL_W
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#endif
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#define IPOL_Z
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#ifdef CMP_W
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#undef CMP_W
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#define CMP_Z
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#endif
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#ifdef WRITE_W
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#undef WRITE_W
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#define WRITE_Z
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#endif
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#endif
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namespace irr
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{
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namespace video
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{
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class CTRGouraud2 : public IBurningShader
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{
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public:
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//! constructor
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CTRGouraud2(IDepthBuffer* zbuffer);
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//! draws an indexed triangle list
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virtual void drawTriangle ( const s4DVertex *a,const s4DVertex *b,const s4DVertex *c );
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private:
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void scanline_bilinear ();
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sScanConvertData scan;
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sScanLineData line;
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};
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//! constructor
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CTRGouraud2::CTRGouraud2(IDepthBuffer* zbuffer)
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: IBurningShader(zbuffer)
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{
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#ifdef _DEBUG
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setDebugName("CTRGouraud2");
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#endif
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}
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/*!
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*/
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void CTRGouraud2::scanline_bilinear ()
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{
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tVideoSample *dst;
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#ifdef USE_ZBUFFER
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fp24 *z;
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#endif
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s32 xStart;
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s32 xEnd;
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s32 dx;
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#ifdef SUBTEXEL
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f32 subPixel;
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#endif
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#ifdef IPOL_Z
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f32 slopeZ;
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#endif
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#ifdef IPOL_W
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fp24 slopeW;
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#endif
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#ifdef IPOL_C0
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sVec4 slopeC;
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#endif
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#ifdef IPOL_T0
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sVec2 slopeT0;
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#endif
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#ifdef IPOL_T1
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sVec2 slopeT1;
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#endif
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// apply top-left fill-convention, left
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xStart = irr::core::ceil32( line.x[0] );
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xEnd = irr::core::ceil32( line.x[1] ) - 1;
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dx = xEnd - xStart;
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if ( dx < 0 )
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return;
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// slopes
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const f32 invDeltaX = core::reciprocal_approxim ( line.x[1] - line.x[0] );
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#ifdef IPOL_Z
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slopeZ = (line.z[1] - line.z[0]) * invDeltaX;
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#endif
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#ifdef IPOL_W
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slopeW = (line.w[1] - line.w[0]) * invDeltaX;
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#endif
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#ifdef IPOL_C0
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slopeC = (line.c[1] - line.c[0]) * invDeltaX;
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#endif
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#ifdef IPOL_T0
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slopeT0 = (line.t0[1] - line.t0[0]) * invDeltaX;
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#endif
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#ifdef IPOL_T1
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slopeT1 = (line.t1[1] - line.t1[0]) * invDeltaX;
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#endif
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#ifdef SUBTEXEL
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subPixel = ( (f32) xStart ) - line.x[0];
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#ifdef IPOL_Z
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line.z[0] += slopeZ * subPixel;
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#endif
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#ifdef IPOL_W
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line.w[0] += slopeW * subPixel;
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#endif
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#ifdef IPOL_C0
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line.c[0] += slopeC * subPixel;
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#endif
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#ifdef IPOL_T0
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line.t0[0] += slopeT0 * subPixel;
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#endif
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#ifdef IPOL_T1
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line.t1[0] += slopeT1 * subPixel;
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#endif
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#endif
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dst = lockedSurface + ( line.y * SurfaceWidth ) + xStart;
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#ifdef USE_ZBUFFER
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z = lockedZBuffer + ( line.y * SurfaceWidth ) + xStart;
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#endif
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#ifdef IPOL_C0
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tFixPoint r0, g0, b0;
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#ifdef INVERSE_W
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f32 inversew;
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#endif
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#endif
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for ( s32 i = 0; i <= dx; ++i )
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{
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#ifdef CMP_Z
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if ( line.z[0] < z[i] )
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#endif
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#ifdef CMP_W
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if ( line.w[0] >= z[i] )
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#endif
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{
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#ifdef IPOL_C0
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#ifdef INVERSE_W
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inversew = core::reciprocal ( line.w[0] );
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getSample_color ( r0, g0, b0, line.c[0] * inversew );
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#else
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getSample_color ( r0, g0, b0, line.c[0] );
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#endif
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dst[i] = fix_to_color ( r0, g0, b0 );
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#else
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dst[i] = COLOR_BRIGHT_WHITE;
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#endif
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#ifdef WRITE_Z
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z[i] = line.z[0];
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#endif
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#ifdef WRITE_W
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z[i] = line.w[0];
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#endif
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}
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#ifdef IPOL_Z
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line.z[0] += slopeZ;
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#endif
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#ifdef IPOL_W
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line.w[0] += slopeW;
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#endif
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#ifdef IPOL_C0
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line.c[0] += slopeC;
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#endif
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#ifdef IPOL_T0
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line.t0[0] += slopeT0;
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#endif
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#ifdef IPOL_T1
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line.t1[0] += slopeT1;
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#endif
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}
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}
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void CTRGouraud2::drawTriangle ( const s4DVertex *a,const s4DVertex *b,const s4DVertex *c )
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{
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// sort on height, y
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if ( a->Pos.y > b->Pos.y ) swapVertexPointer(&a, &b);
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if ( a->Pos.y > c->Pos.y ) swapVertexPointer(&a, &c);
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if ( b->Pos.y > c->Pos.y ) swapVertexPointer(&b, &c);
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// calculate delta y of the edges
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scan.invDeltaY[0] = core::reciprocal ( c->Pos.y - a->Pos.y );
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scan.invDeltaY[1] = core::reciprocal ( b->Pos.y - a->Pos.y );
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scan.invDeltaY[2] = core::reciprocal ( c->Pos.y - b->Pos.y );
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if ( F32_LOWER_EQUAL_0 ( scan.invDeltaY[0] ) )
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return;
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// find if the major edge is left or right aligned
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f32 temp[4];
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temp[0] = a->Pos.x - c->Pos.x;
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temp[1] = a->Pos.y - c->Pos.y;
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temp[2] = b->Pos.x - a->Pos.x;
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temp[3] = b->Pos.y - a->Pos.y;
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scan.left = ( temp[0] * temp[3] - temp[1] * temp[2] ) > (f32) 0.0 ? 0 : 1;
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scan.right = 1 - scan.left;
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// calculate slopes for the major edge
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scan.slopeX[0] = (c->Pos.x - a->Pos.x) * scan.invDeltaY[0];
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scan.x[0] = a->Pos.x;
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#ifdef IPOL_Z
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scan.slopeZ[0] = (c->Pos.z - a->Pos.z) * scan.invDeltaY[0];
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scan.z[0] = a->Pos.z;
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#endif
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#ifdef IPOL_W
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scan.slopeW[0] = (c->Pos.w - a->Pos.w) * scan.invDeltaY[0];
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scan.w[0] = a->Pos.w;
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#endif
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#ifdef IPOL_C0
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scan.slopeC[0] = (c->Color[0] - a->Color[0]) * scan.invDeltaY[0];
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scan.c[0] = a->Color[0];
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#endif
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#ifdef IPOL_T0
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scan.slopeT0[0] = (c->Tex[0] - a->Tex[0]) * scan.invDeltaY[0];
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scan.t0[0] = a->Tex[0];
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#endif
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#ifdef IPOL_T1
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scan.slopeT1[0] = (c->Tex[1] - a->Tex[1]) * scan.invDeltaY[0];
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scan.t1[0] = a->Tex[1];
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#endif
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// top left fill convention y run
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s32 yStart;
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s32 yEnd;
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#ifdef SUBTEXEL
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f32 subPixel;
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#endif
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lockedSurface = (tVideoSample*)RenderTarget->lock();
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#ifdef USE_ZBUFFER
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lockedZBuffer = ZBuffer->lock();
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#endif
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#ifdef IPOL_T0
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IT[0].data = (tVideoSample*)IT[0].Texture->lock();
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#endif
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#ifdef IPOL_T1
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IT[1].data = (tVideoSample*)IT[1].Texture->lock();
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#endif
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// rasterize upper sub-triangle
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if ( (f32) 0.0 != scan.invDeltaY[1] )
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{
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// calculate slopes for top edge
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scan.slopeX[1] = (b->Pos.x - a->Pos.x) * scan.invDeltaY[1];
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scan.x[1] = a->Pos.x;
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#ifdef IPOL_Z
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scan.slopeZ[1] = (b->Pos.z - a->Pos.z) * scan.invDeltaY[1];
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scan.z[1] = a->Pos.z;
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#endif
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#ifdef IPOL_W
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scan.slopeW[1] = (b->Pos.w - a->Pos.w) * scan.invDeltaY[1];
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scan.w[1] = a->Pos.w;
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#endif
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#ifdef IPOL_C0
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scan.slopeC[1] = (b->Color[0] - a->Color[0]) * scan.invDeltaY[1];
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scan.c[1] = a->Color[0];
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#endif
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#ifdef IPOL_T0
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scan.slopeT0[1] = (b->Tex[0] - a->Tex[0]) * scan.invDeltaY[1];
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scan.t0[1] = a->Tex[0];
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#endif
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#ifdef IPOL_T1
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scan.slopeT1[1] = (b->Tex[1] - a->Tex[1]) * scan.invDeltaY[1];
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scan.t1[1] = a->Tex[1];
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#endif
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// apply top-left fill convention, top part
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yStart = irr::core::ceil32( a->Pos.y );
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yEnd = irr::core::ceil32( b->Pos.y ) - 1;
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#ifdef SUBTEXEL
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subPixel = ( (f32) yStart ) - a->Pos.y;
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// correct to pixel center
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scan.x[0] += scan.slopeX[0] * subPixel;
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scan.x[1] += scan.slopeX[1] * subPixel;
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#ifdef IPOL_Z
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scan.z[0] += scan.slopeZ[0] * subPixel;
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scan.z[1] += scan.slopeZ[1] * subPixel;
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#endif
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#ifdef IPOL_W
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scan.w[0] += scan.slopeW[0] * subPixel;
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scan.w[1] += scan.slopeW[1] * subPixel;
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#endif
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#ifdef IPOL_C0
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scan.c[0] += scan.slopeC[0] * subPixel;
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scan.c[1] += scan.slopeC[1] * subPixel;
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#endif
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#ifdef IPOL_T0
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scan.t0[0] += scan.slopeT0[0] * subPixel;
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scan.t0[1] += scan.slopeT0[1] * subPixel;
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#endif
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#ifdef IPOL_T1
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scan.t1[0] += scan.slopeT1[0] * subPixel;
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scan.t1[1] += scan.slopeT1[1] * subPixel;
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#endif
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#endif
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// rasterize the edge scanlines
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for( line.y = yStart; line.y <= yEnd; ++line.y)
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{
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line.x[scan.left] = scan.x[0];
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line.x[scan.right] = scan.x[1];
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#ifdef IPOL_Z
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line.z[scan.left] = scan.z[0];
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line.z[scan.right] = scan.z[1];
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#endif
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#ifdef IPOL_W
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line.w[scan.left] = scan.w[0];
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line.w[scan.right] = scan.w[1];
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#endif
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#ifdef IPOL_C0
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line.c[scan.left] = scan.c[0];
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line.c[scan.right] = scan.c[1];
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#endif
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#ifdef IPOL_T0
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line.t0[scan.left] = scan.t0[0];
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line.t0[scan.right] = scan.t0[1];
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#endif
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#ifdef IPOL_T1
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line.t1[scan.left] = scan.t1[0];
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line.t1[scan.right] = scan.t1[1];
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#endif
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// render a scanline
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scanline_bilinear ();
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scan.x[0] += scan.slopeX[0];
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scan.x[1] += scan.slopeX[1];
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#ifdef IPOL_Z
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scan.z[0] += scan.slopeZ[0];
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scan.z[1] += scan.slopeZ[1];
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#endif
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#ifdef IPOL_W
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scan.w[0] += scan.slopeW[0];
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scan.w[1] += scan.slopeW[1];
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#endif
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#ifdef IPOL_C0
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scan.c[0] += scan.slopeC[0];
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scan.c[1] += scan.slopeC[1];
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#endif
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#ifdef IPOL_T0
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scan.t0[0] += scan.slopeT0[0];
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scan.t0[1] += scan.slopeT0[1];
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#endif
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#ifdef IPOL_T1
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scan.t1[0] += scan.slopeT1[0];
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scan.t1[1] += scan.slopeT1[1];
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#endif
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}
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}
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// rasterize lower sub-triangle
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if ( (f32) 0.0 != scan.invDeltaY[2] )
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{
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// advance to middle point
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if( (f32) 0.0 != scan.invDeltaY[1] )
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{
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temp[0] = b->Pos.y - a->Pos.y; // dy
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scan.x[0] = a->Pos.x + scan.slopeX[0] * temp[0];
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#ifdef IPOL_Z
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scan.z[0] = a->Pos.z + scan.slopeZ[0] * temp[0];
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#endif
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#ifdef IPOL_W
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scan.w[0] = a->Pos.w + scan.slopeW[0] * temp[0];
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#endif
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#ifdef IPOL_C0
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scan.c[0] = a->Color[0] + scan.slopeC[0] * temp[0];
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#endif
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#ifdef IPOL_T0
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scan.t0[0] = a->Tex[0] + scan.slopeT0[0] * temp[0];
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#endif
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#ifdef IPOL_T1
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scan.t1[0] = a->Tex[1] + scan.slopeT1[0] * temp[0];
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#endif
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}
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// calculate slopes for bottom edge
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scan.slopeX[1] = (c->Pos.x - b->Pos.x) * scan.invDeltaY[2];
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scan.x[1] = b->Pos.x;
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#ifdef IPOL_Z
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scan.slopeZ[1] = (c->Pos.z - b->Pos.z) * scan.invDeltaY[2];
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scan.z[1] = b->Pos.z;
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#endif
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#ifdef IPOL_W
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scan.slopeW[1] = (c->Pos.w - b->Pos.w) * scan.invDeltaY[2];
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scan.w[1] = b->Pos.w;
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#endif
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#ifdef IPOL_C0
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scan.slopeC[1] = (c->Color[0] - b->Color[0]) * scan.invDeltaY[2];
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scan.c[1] = b->Color[0];
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#endif
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#ifdef IPOL_T0
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scan.slopeT0[1] = (c->Tex[0] - b->Tex[0]) * scan.invDeltaY[2];
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scan.t0[1] = b->Tex[0];
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#endif
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#ifdef IPOL_T1
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scan.slopeT1[1] = (c->Tex[1] - b->Tex[1]) * scan.invDeltaY[2];
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scan.t1[1] = b->Tex[1];
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#endif
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// apply top-left fill convention, top part
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yStart = irr::core::ceil32( b->Pos.y );
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yEnd = irr::core::ceil32( c->Pos.y ) - 1;
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#ifdef SUBTEXEL
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subPixel = ( (f32) yStart ) - b->Pos.y;
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|
|
|
// 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] += scan.slopeC[0] * subPixel;
|
|
scan.c[1] += scan.slopeC[1] * subPixel;
|
|
#endif
|
|
|
|
#ifdef IPOL_T0
|
|
scan.t0[0] += scan.slopeT0[0] * subPixel;
|
|
scan.t0[1] += scan.slopeT0[1] * subPixel;
|
|
#endif
|
|
|
|
#ifdef IPOL_T1
|
|
scan.t1[0] += scan.slopeT1[0] * subPixel;
|
|
scan.t1[1] += scan.slopeT1[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[scan.left] = scan.c[0];
|
|
line.c[scan.right] = scan.c[1];
|
|
#endif
|
|
|
|
#ifdef IPOL_T0
|
|
line.t0[scan.left] = scan.t0[0];
|
|
line.t0[scan.right] = scan.t0[1];
|
|
#endif
|
|
|
|
#ifdef IPOL_T1
|
|
line.t1[scan.left] = scan.t1[0];
|
|
line.t1[scan.right] = scan.t1[1];
|
|
#endif
|
|
|
|
// render a scanline
|
|
scanline_bilinear ();
|
|
|
|
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] += scan.slopeC[0];
|
|
scan.c[1] += scan.slopeC[1];
|
|
#endif
|
|
|
|
#ifdef IPOL_T0
|
|
scan.t0[0] += scan.slopeT0[0];
|
|
scan.t0[1] += scan.slopeT0[1];
|
|
#endif
|
|
|
|
#ifdef IPOL_T1
|
|
scan.t1[0] += scan.slopeT1[0];
|
|
scan.t1[1] += scan.slopeT1[1];
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
RenderTarget->unlock();
|
|
|
|
#ifdef USE_ZBUFFER
|
|
ZBuffer->unlock();
|
|
#endif
|
|
|
|
#ifdef IPOL_T0
|
|
IT[0].Texture->unlock();
|
|
#endif
|
|
|
|
#ifdef IPOL_T1
|
|
IT[1].Texture->unlock();
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
} // end namespace video
|
|
} // end namespace irr
|
|
|
|
#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_
|
|
|
|
namespace irr
|
|
{
|
|
namespace video
|
|
{
|
|
|
|
//! creates a flat triangle renderer
|
|
IBurningShader* createTriangleRendererGouraud2(IDepthBuffer* zbuffer)
|
|
{
|
|
#ifdef _IRR_COMPILE_WITH_BURNINGSVIDEO_
|
|
return new CTRGouraud2(zbuffer);
|
|
#else
|
|
return 0;
|
|
#endif // _IRR_COMPILE_WITH_BURNINGSVIDEO_
|
|
}
|
|
|
|
|
|
} // end namespace video
|
|
} // end namespace irr
|
|
|
|
|
|
|