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fix sub pixel gaps on 2D visuals due to MSAA (#1254)

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* fix sub pixel gaps on 2D visuals due to MSAA

* Guard against zero width viewport before pixel snapping
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Isaac0-dev 2026-05-20 13:21:33 +10:00 • committed by GitHub
parent 733ad1181b
commit 9bfe87f486
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GPG key ID: B5690EEEBB952194
1 changed files with 12 additions and 2 deletions
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14
src/pc/gfx/gfx_pc.c
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@ -133,7 +133,7 @@ int gShaderFlags[SHADER_FLAG_MAX] = { 0 };
f32 gDefaultShaderFlagValues[SHADER_FLAG_MAX] = {
[SHADER_FLAG_HUE] = 0.0f,
[SHADER_FLAG_SATURATION] = 1.0f,
[SHADER_FLAG_BRIGHTNESS] = 1.0f,
[SHADER_FLAG_BRIGHTNESS] = 1.0f,
[SHADER_FLAG_CONTRAST] = 1.0f,
[SHADER_FLAG_EXPOSURE] = 1.0f,
[SHADER_FLAG_DITHERING] = 0.0f,
@ -718,7 +718,17 @@ static void gfx_sp_pop_matrix(uint32_t count) {
}
static float gfx_adjust_x_for_aspect_ratio(float x) {
return x * gfx_current_dimensions.x_adjust_ratio;
float adjusted = x * gfx_current_dimensions.x_adjust_ratio;
// Force 2D coordinates to be aligned perfectly on the nearest pixel
// This prevents MSAA sub-pixel gaps (e.g. on vanilla dialog boxes)
if (rsp.P_matrix[3][3] > 0.5f && rdp.viewport.width > 0.0f) {
float pixelX = rdp.viewport.x + (adjusted + 1.0f) * 0.5f * rdp.viewport.width;
pixelX = floorf(pixelX + 0.5f);
adjusted = ((pixelX - rdp.viewport.x) / rdp.viewport.width) * 2.0f - 1.0f;
}
return adjusted;
}
static OPTIMIZE_O3 void gfx_local_to_world_space(VEC_OUT Vec3f pos, VEC_OUT Vec3f normal) {