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Merge pull request #697 from TartanSpartan/fix-scissor-viewport

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Improve scissor operations to correct "thin blue line" bug
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fgsfds authored and GitHub committed 2026-03-23 10:33:12 +01:00
2 parents 27b2dcc27d bcb8c2720a
commit 8470d50f21
1 file changed
+12 -5
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port/fast3d/gfx_pc.cpp
+12 -5
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@@ -1641,11 +1641,18 @@ static void gfx_sp_extra_geometry_mode(uint32_t clear, uint32_t set) {
static void gfx_adjust_viewport_or_scissor(XYWidthHeight* area, bool preserve_aspect = false) {
// HACK: assume all target framebuffers have the same aspect
area->width *= RATIO_X;
area->x *= RATIO_X;
area->height *= RATIO_Y;
area->y = SCREEN_HEIGHT - area->y;
area->y *= RATIO_Y;
// Use floor/ceil to ensure scissor fully contains the logical region
// and prevents sub-pixel gaps at viewport edges
float x1 = area->x * RATIO_X;
float y1 = (SCREEN_HEIGHT - area->y) * RATIO_Y;
float x2 = (area->x + area->width) * RATIO_X;
float y2 = (SCREEN_HEIGHT - area->y + area->height) * RATIO_Y;
area->x = std::floor(x1);
area->y = std::floor(y1);
area->width = std::ceil(x2) - area->x;
area->height = std::ceil(y2) - area->y;
if (preserve_aspect) {
// preserve native aspect ratio
const float ratio = gfx_current_native_aspect / gfx_current_dimensions.aspect_ratio;