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optimize texture sampling

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asrael 2025-11-15 14:23:53 -06:00
parent 736af38518
commit b2682a2d40
3 changed files with 26 additions and 21 deletions
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13
src/pxl8_gfx.c
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@ -810,8 +810,9 @@ void pxl8_3d_clear_zbuffer(pxl8_gfx* gfx) {
i32 count = gfx->zbuffer_width * gfx->zbuffer_height;
const f32 far_z = 1e30f;
f32* ptr = gfx->zbuffer;
for (i32 i = 0; i < count; i++) {
gfx->zbuffer[i] = far_z;
ptr[i] = far_z;
}
}
@ -1002,11 +1003,13 @@ static inline u32 pxl8_sample_texture(pxl8_gfx* gfx, u32 texture_id, f32 u, f32
return 0;
}
u = u - floorf(u);
v = v - floorf(v);
i32 tex_u = (i32)(u * entry->w);
i32 tex_v = (i32)(v * entry->h);
i32 tx = (i32)(u * entry->w) % entry->w;
i32 ty = (i32)(v * entry->h) % entry->h;
i32 tx = tex_u % entry->w;
if (tx < 0) tx += entry->w;
i32 ty = tex_v % entry->h;
if (ty < 0) ty += entry->h;
i32 atlas_x = entry->x + tx;
i32 atlas_y = entry->y + ty;