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early exit if nothing to draw on a span

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This commit is contained in:
Colin James Wood 2026-05-20 00:41:16 +01:00
parent 5849baee99
commit 4a207151e2
1 changed files with 6 additions and 4 deletions
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10
src/external/rlsw.h vendored
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@ -5389,6 +5389,12 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
int xEnd = (int)end->position[0]; int xEnd = (int)end->position[0];
if (xStart == xEnd) return; if (xStart == xEnd) return;
// Intercept the span bounds to ensure we don't write before the framebuffer.
int xLoopStart = (xStart >= 0)? xStart : 0;
int xLoopEnd = (xEnd <= RLSW.colorBuffer->width)? xEnd : RLSW.colorBuffer->width;
// Nothing to draw.
if (xLoopStart >= xLoopEnd) return;
// Get the current row and skip if outside the framebuffer. // Get the current row and skip if outside the framebuffer.
// Maybe this check is better suited elsewhere? // Maybe this check is better suited elsewhere?
int y = (int)start->position[1]; int y = (int)start->position[1];
@ -5416,10 +5422,6 @@ static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t
// Compute the subpixel distance to traverse before the first pixel // Compute the subpixel distance to traverse before the first pixel
float xSubstep = 1.0f - sw_fract(start->position[0]); float xSubstep = 1.0f - sw_fract(start->position[0]);
// Intercept the span bounds to ensure we don't write before the framebuffer.
int xLoopStart = sw_clamp_int(xStart, 0, RLSW.colorBuffer->width - 1);
int dxStart = xLoopStart - xStart;
// Initializing the interpolation starting values. // Initializing the interpolation starting values.
// Also step further into them to move away from the colorbuffer edge. // 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*xSubstep + dWdx*dxStart;