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fix out of bounds on linear texture sampling and screen space pixel centers

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This commit is contained in:
Colin James Wood 2026-05-07 15:37:09 +01:00
parent aceb8ce3a8
commit 55db60fd67
1 changed files with 12 additions and 0 deletions
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12
src/external/rlsw.h vendored
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@ -2483,6 +2483,7 @@ static inline void sw_texture_sample_nearest(float *SW_RESTRICT color, const sw_
{
u = (tex->sWrap == SW_REPEAT)? sw_fract(u) : sw_saturate(u);
x = (int)(u*tex->width);
x = sw_clamp_int(x, 0, tex->wMinus1);
}
#ifdef SW_TEXTURE_REPEAT_POT_FAST
@ -2495,6 +2496,7 @@ static inline void sw_texture_sample_nearest(float *SW_RESTRICT color, const sw_
{
v = (tex->tWrap == SW_REPEAT)? sw_fract(v) : sw_saturate(v);
y = (int)(v*tex->height);
y = sw_clamp_int(y, 0, tex->hMinus1);
}
tex->readColor(color, tex->pixels, y*tex->width + x);
@ -3484,6 +3486,11 @@ static void sw_triangle_clip_and_project(void)
// Transformation to screen space
sw_project_ndc_to_screen(v->position);
// NDC +1.0 projects to exactly (width + 0.5f), which truncates out of bounds
// Clamp screen-space coordinates to valid pixel centers.
v->position[0] = sw_clamp(v->position[0], 0.0f, (float)(RLSW.colorBuffer->width - 1) + 0.5f);
v->position[1] = sw_clamp(v->position[1], 0.0f, (float)(RLSW.colorBuffer->height - 1) + 0.5f);
}
}
}
@ -3599,6 +3606,11 @@ static void sw_quad_clip_and_project(void)
// Transformation to screen space
sw_project_ndc_to_screen(v->position);
// NDC +1.0 projects to exactly (width + 0.5f), which truncates out of bounds
// Clamp screen-space coordinates to valid pixel centers.
v->position[0] = sw_clamp(v->position[0], 0.0f, (float)(RLSW.colorBuffer->width - 1) + 0.5f);
v->position[1] = sw_clamp(v->position[1], 0.0f, (float)(RLSW.colorBuffer->height - 1) + 0.5f);
}
}
}