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early exit for quads, with a float cast on the left and top distance calculation

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Colin James Wood 2026-05-20 00:50:35 +01:00
parent 5c9e1ff312
commit 6768b73adc
1 changed files with 11 additions and 7 deletions
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18
src/external/rlsw.h vendored
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@ -5692,6 +5692,14 @@ static void SW_RASTER_QUAD(const sw_vertex_t *a, const sw_vertex_t *b,
int xMax = (int)br->position[0]; int xMax = (int)br->position[0];
int yMax = (int)br->position[1]; int yMax = (int)br->position[1];
// Exit early if no pixels to draw. Use these later for loop boundaries
int yLoopMin = (yMin >= 0)? yMin : 0;
int xLoopMin = (xMin >= 0)? xMin : 0;
int yLoopMax = (yMax <= RLSW.colorBuffer->height)? yMax : RLSW.colorBuffer->height;
int xLoopMax = (xMax <= RLSW.colorBuffer->width)? xMax : RLSW.colorBuffer->width;
if (yLoopMin >= yLoopMax || xLoopMin >= xLoopMax) return;
float w = (float)(xMax - xMin); float w = (float)(xMax - xMin);
float h = (float)(yMax - yMin); float h = (float)(yMax - yMin);
if ((w <= 0) || (h <= 0)) return; if ((w <= 0) || (h <= 0)) return;
@ -5745,13 +5753,9 @@ static void SW_RASTER_QUAD(const sw_vertex_t *a, const sw_vertex_t *b,
uint8_t *dPixels = RLSW.depthBuffer->pixels; uint8_t *dPixels = RLSW.depthBuffer->pixels;
#endif #endif
// Intercept the boundaries to stay within the framebuffer. // Calculate the distance the in-bounds boundary is from the quad's edges, only on the left and top.
int yLoopMin = sw_clamp_int(yMin, 0, RLSW.colorBuffer->height - 1); float dxMin = (float)(xLoopMin - xMin);
int yLoopMax = sw_clamp_int(yMax, 0, RLSW.colorBuffer->height); float dyMin = (float)(yLoopMin - yMin);
int xLoopMin = sw_clamp_int(xMin, 0, RLSW.colorBuffer->width - 1);
int xLoopMax = sw_clamp_int(xMax, 0, RLSW.colorBuffer->width);
int dxMin = xLoopMin - xMin;
int dyMin = yLoopMin - yMin;
// Correct our start by how far we clipped outside the framebuffer. // Correct our start by how far we clipped outside the framebuffer.
cRow[0] += dCdx[0]*dxMin + dCdy[0]*dyMin; cRow[0] += dCdx[0]*dxMin + dCdy[0]*dyMin;