subpixel corretion for quads
This commit is contained in:
Bigfoot71
parent
6fe42e32e5
commit
66d83d029c
106
src/external/rlsw.h
vendored
106
src/external/rlsw.h
vendored
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@ -2354,11 +2354,12 @@ static inline void FUNC_NAME(const sw_texture_t *tex, const sw_vertex_t *start,
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float dZdx = (end->homogeneous[2] - start->homogeneous[2])*dxRcp; \
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float dWdx = (end->homogeneous[3] - start->homogeneous[3])*dxRcp; \
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\
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float dCdx[4] = { 0 }; \
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dCdx[0] = (end->color[0] - start->color[0])*dxRcp; \
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dCdx[1] = (end->color[1] - start->color[1])*dxRcp; \
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dCdx[2] = (end->color[2] - start->color[2])*dxRcp; \
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dCdx[3] = (end->color[3] - start->color[3])*dxRcp; \
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float dCdx[4] = { \
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(end->color[0] - start->color[0])*dxRcp, \
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(end->color[1] - start->color[1])*dxRcp, \
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(end->color[2] - start->color[2])*dxRcp, \
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(end->color[3] - start->color[3])*dxRcp \
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}; \
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\
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float dUdx = 0.0f; \
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float dVdx = 0.0f; \
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@ -2408,6 +2409,7 @@ static inline void FUNC_NAME(const sw_texture_t *tex, const sw_vertex_t *start,
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if (z > depth) goto discard; \
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} \
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\
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/* TODO: Implement depth mask */ \
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sw_framebuffer_write_depth(dptr, z); \
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\
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if (ENABLE_TEXTURE) \
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@ -2776,36 +2778,41 @@ static inline void FUNC_NAME(void)
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int xMax = (int)v2->screen[0]; \
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int yMax = (int)v2->screen[1]; \
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\
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int width = xMax - xMin; \
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int height = yMax - yMin; \
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float w = v2->screen[0] - v0->screen[0]; \
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float h = v2->screen[1] - v0->screen[1]; \
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\
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if ((width == 0) || (height == 0)) return; \
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if ((w == 0) || (h == 0)) return; \
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\
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float wRcp = (width > 0.0f)? 1.0f/width : 0.0f; \
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float hRcp = (height > 0.0f)? 1.0f/height : 0.0f; \
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float wRcp = (w > 0.0f)? 1.0f/w : 0.0f; \
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float hRcp = (h > 0.0f)? 1.0f/h : 0.0f; \
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\
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/* Subpixel corrections */ \
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float xSubstep = 1.0f - sw_fract(v0->screen[0]); \
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float ySubstep = 1.0f - sw_fract(v0->screen[1]); \
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\
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/* Calculation of vertex gradients in X and Y */ \
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float tcDx[2], tcDy[2]; \
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float dUdx, dVdx; \
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float dUdy, dVdy; \
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if (ENABLE_TEXTURE) { \
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tcDx[0] = (v1->texcoord[0] - v0->texcoord[0])*wRcp; \
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tcDx[1] = (v1->texcoord[1] - v0->texcoord[1])*wRcp; \
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tcDy[0] = (v3->texcoord[0] - v0->texcoord[0])*hRcp; \
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tcDy[1] = (v3->texcoord[1] - v0->texcoord[1])*hRcp; \
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dUdx = (v1->texcoord[0] - v0->texcoord[0])*wRcp; \
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dVdx = (v1->texcoord[1] - v0->texcoord[1])*wRcp; \
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dUdy = (v3->texcoord[0] - v0->texcoord[0])*hRcp; \
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dVdy = (v3->texcoord[1] - v0->texcoord[1])*hRcp; \
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} \
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\
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float cDx[4], cDy[4]; \
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cDx[0] = (v1->color[0] - v0->color[0])*wRcp; \
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cDx[1] = (v1->color[1] - v0->color[1])*wRcp; \
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cDx[2] = (v1->color[2] - v0->color[2])*wRcp; \
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cDx[3] = (v1->color[3] - v0->color[3])*wRcp; \
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cDy[0] = (v3->color[0] - v0->color[0])*hRcp; \
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cDy[1] = (v3->color[1] - v0->color[1])*hRcp; \
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cDy[2] = (v3->color[2] - v0->color[2])*hRcp; \
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cDy[3] = (v3->color[3] - v0->color[3])*hRcp; \
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float dCdx[4], dCdy[4]; \
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dCdx[0] = (v1->color[0] - v0->color[0])*wRcp; \
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dCdx[1] = (v1->color[1] - v0->color[1])*wRcp; \
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dCdx[2] = (v1->color[2] - v0->color[2])*wRcp; \
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dCdx[3] = (v1->color[3] - v0->color[3])*wRcp; \
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dCdy[0] = (v3->color[0] - v0->color[0])*hRcp; \
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dCdy[1] = (v3->color[1] - v0->color[1])*hRcp; \
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dCdy[2] = (v3->color[2] - v0->color[2])*hRcp; \
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dCdy[3] = (v3->color[3] - v0->color[3])*hRcp; \
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\
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float zDx, zDy; \
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zDx = (v1->homogeneous[2] - v0->homogeneous[2])*wRcp; \
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zDy = (v3->homogeneous[2] - v0->homogeneous[2])*hRcp; \
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float dZdx, dZdy; \
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dZdx = (v1->homogeneous[2] - v0->homogeneous[2])*wRcp; \
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dZdy = (v3->homogeneous[2] - v0->homogeneous[2])*hRcp; \
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\
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/* Start of quad rasterization */ \
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const sw_texture_t *tex; \
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@ -2815,15 +2822,15 @@ static inline void FUNC_NAME(void)
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void *dDstBase = RLSW.framebuffer.depth; \
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int wDst = RLSW.framebuffer.width; \
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\
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float zScanline = v0->homogeneous[2]; \
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float uScanline = v0->texcoord[0]; \
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float vScanline = v0->texcoord[1]; \
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float zScanline = v0->homogeneous[2] + dZdx*xSubstep + dZdy*ySubstep; \
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float uScanline = v0->texcoord[0] + dUdx*xSubstep + dUdy*ySubstep; \
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float vScanline = v0->texcoord[1] + dVdx*xSubstep + dVdy*ySubstep; \
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\
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float colorScanline[4] = { \
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v0->color[0], \
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v0->color[1], \
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v0->color[2], \
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v0->color[3] \
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v0->color[0] + dCdx[0]*xSubstep + dCdy[0]*ySubstep, \
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v0->color[1] + dCdx[1]*xSubstep + dCdy[1]*ySubstep, \
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v0->color[2] + dCdx[2]*xSubstep + dCdy[2]*ySubstep, \
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v0->color[3] + dCdx[3]*xSubstep + dCdy[3]*ySubstep \
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}; \
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\
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for (int y = yMin; y < yMax; y++) \
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@ -2861,12 +2868,13 @@ static inline void FUNC_NAME(void)
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if (z > depth) goto discard; \
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} \
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\
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/* TODO: Implement depth mask */ \
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sw_framebuffer_write_depth(dptr, z); \
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\
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if (ENABLE_TEXTURE) \
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{ \
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float texColor[4]; \
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sw_texture_sample(texColor, tex, u, v, tcDx[0], tcDy[0], tcDx[1], tcDy[1]); \
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sw_texture_sample(texColor, tex, u, v, dUdx, dUdy, dVdx, dVdy); \
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srcColor[0] *= texColor[0]; \
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srcColor[1] *= texColor[1]; \
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srcColor[2] *= texColor[2]; \
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@ -2883,32 +2891,32 @@ static inline void FUNC_NAME(void)
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else sw_framebuffer_write_color(cptr, srcColor); \
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\
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discard: \
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z += zDx; \
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color[0] += cDx[0]; \
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color[1] += cDx[1]; \
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color[2] += cDx[2]; \
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color[3] += cDx[3]; \
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z += dZdx; \
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color[0] += dCdx[0]; \
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color[1] += dCdx[1]; \
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color[2] += dCdx[2]; \
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color[3] += dCdx[3]; \
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\
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if (ENABLE_TEXTURE) \
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{ \
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u += tcDx[0]; \
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v += tcDx[1]; \
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u += dUdx; \
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v += dVdx; \
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} \
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\
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INC_COLOR_PTR(cptr); \
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INC_DEPTH_PTR(dptr); \
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} \
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\
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zScanline += zDy; \
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colorScanline[0] += cDy[0]; \
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colorScanline[1] += cDy[1]; \
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colorScanline[2] += cDy[2]; \
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colorScanline[3] += cDy[3]; \
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zScanline += dZdy; \
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colorScanline[0] += dCdy[0]; \
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colorScanline[1] += dCdy[1]; \
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colorScanline[2] += dCdy[2]; \
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colorScanline[3] += dCdy[3]; \
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\
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if (ENABLE_TEXTURE) \
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{ \
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uScanline += tcDy[0]; \
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vScanline += tcDy[1]; \
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uScanline += dUdy; \
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vScanline += dVdy; \
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} \
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} \
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}
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