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apply the RASTER_QUAD offset at the loop start so it increments correctly

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Colin James Wood 2026-05-09 11:44:19 +01:00
parent da9988e670
commit 7f0d179313
1 changed files with 24 additions and 9 deletions
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33
src/external/rlsw.h vendored
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@ -5752,25 +5752,36 @@ static void SW_RASTER_QUAD(const sw_vertex_t *a, const sw_vertex_t *b,
int dyMin = yLoopMin - yMin;
#endif
// Correct our start by how far we clipped outside the framebuffer.
cRow[0] += dCdx[0]*dxMin + dCdy[0]*dyMin;
cRow[1] += dCdx[1]*dxMin + dCdy[1]*dyMin;
cRow[2] += dCdx[2]*dxMin + dCdy[2]*dyMin;
cRow[3] += dCdx[3]*dxMin + dCdy[3]*dyMin;
#ifdef SW_ENABLE_DEPTH_TEST
zRow += dZdy*dyMin + dZdx*dxMin;
#ifdef SW_ENABLE_TEXTURE
uRow += dUdy*dyMin + dUdx*dxMin;
vRow += dVdy*dyMin + dVdx*dxMin;
#endif
for (int y = yLoopMin; y < yLoopMax; y++)
{
int baseOffset = y*stride + xLoopMin;
uint8_t *cPtr = cPixels + baseOffset*SW_FRAMEBUFFER_COLOR_SIZE;
#ifdef SW_ENABLE_DEPTH_TEST
uint8_t *dPtr = dPixels + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
// Correct our start by how far we clipped outside the framebuffer.
float z = zRow + dZdy*dyMin;
// Copy the cursors so we increment them ourselves without destroying the offset maths.
float z = zRow;
#endif
#ifdef SW_ENABLE_TEXTURE
// Correct our start by how far we clipped outside the framebuffer.
float u = uRow + dUdy*dyMin;
float v = vRow + dVdy*dyMin;
float u = uRow;
float v = vRow;
#endif
float color[4] = {
cRow[0] + dCdx[0]*dxMin,
cRow[1] + dCdx[1]*dxMin,
cRow[2] + dCdx[2]*dxMin,
cRow[3] + dCdx[3]*dxMin
cRow[0],
cRow[1],
cRow[2],
cRow[3]
};
for (int x = xLoopMin; x < xLoopMax; x++)
@ -5812,6 +5823,7 @@ static void SW_RASTER_QUAD(const sw_vertex_t *a, const sw_vertex_t *b,
#ifdef SW_ENABLE_DEPTH_TEST
discard:
#endif
// We move one pixel over without touching the original "start offset"
color[0] += dCdx[0];
color[1] += dCdx[1];
color[2] += dCdx[2];
@ -5834,6 +5846,9 @@ static void SW_RASTER_QUAD(const sw_vertex_t *a, const sw_vertex_t *b,
cPtr += SW_FRAMEBUFFER_COLOR_SIZE;
}
// The for loop is clamped to the right side of the screen.
// However, these cursor start vars are still on the left.
// That's fine. We just need to advance to the next row.
cRow[0] += dCdy[0];
cRow[1] += dCdy[1];
cRow[2] += dCdy[2];