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incorporate dxStart into xSubstep to make xOffset calculate a single time

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This commit is contained in:
Colin James Wood 2026-05-20 00:45:08 +01:00
parent 4a207151e2
commit 2cd1746465
1 changed files with 11 additions and 9 deletions
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20
src/external/rlsw.h vendored
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@ -5420,23 +5420,25 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
#endif
// Compute the subpixel distance to traverse before the first pixel
// Also step further into them to move away from the colorbuffer edge.
float xSubstep = 1.0f - sw_fract(start->position[0]);
float dxStart = (float)(xLoopStart - xStart);
float xOffset = xSubstep + dxStart;
// Initializing the interpolation starting values.
// Also step further into them to move away from the colorbuffer edge.
float w = start->position[3] + dWdx*xSubstep + dWdx*dxStart;
float w = start->position[3] + dWdx*xOffset;
float color[4] = {
start->color[0] + dCdx[0]*xSubstep + dCdx[0]*dxStart,
start->color[1] + dCdx[1]*xSubstep + dCdx[1]*dxStart,
start->color[2] + dCdx[2]*xSubstep + dCdx[2]*dxStart,
start->color[3] + dCdx[3]*xSubstep + dCdx[3]*dxStart
start->color[0] + dCdx[0]*xOffset,
start->color[1] + dCdx[1]*xOffset,
start->color[2] + dCdx[2]*xOffset,
start->color[3] + dCdx[3]*xOffset
};
#ifdef SW_ENABLE_DEPTH_TEST
float z = start->position[2] + dZdx*xSubstep + dZdx*dxStart;
float z = start->position[2] + dZdx*xOffset;
#endif
#ifdef SW_ENABLE_TEXTURE
float u = start->texcoord[0] + dUdx*xSubstep + dUdx*dxStart;
float v = start->texcoord[1] + dVdx*xSubstep + dVdx*dxStart;
float u = start->texcoord[0] + dUdx*xOffset;
float v = start->texcoord[1] + dVdx*xOffset;
#endif
// Pre-calculate the starting pointers for the framebuffer row