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Fix texture mapping issues caused by u/v rounding on 2D polygons.

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This commit is contained in:
Lionel Flandrin 2016-02-05 20:10:46 +01:00 committed by twinaphex
parent dd7efadd65
commit 8be1dc31a0
1 changed files with 17 additions and 2 deletions
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19
mednafen/psx/gpu_polygon.cpp
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@ -308,8 +308,23 @@ void PS_GPU::DrawTriangle(tri_vertex *vertices, uint32_t clut)
if(vertices[2].x <= vertices[iggvi].x)
iggvi = 2;
ig.u = COORD_MF_INT(vertices[iggvi].u) + (1 << (COORD_FBS - 1 - upscale_shift));
ig.v = COORD_MF_INT(vertices[iggvi].v) + (1 << (COORD_FBS - 1 - upscale_shift));
ig.u = COORD_MF_INT(vertices[iggvi].u) + (1 << (COORD_FBS - 1));
ig.v = COORD_MF_INT(vertices[iggvi].v) + (1 << (COORD_FBS - 1));
if (upscale_shift > 0) {
// Bias the texture coordinates so that it rounds to the
// correct value when the game is mapping a 2D sprite using
// triangles. Otherwise this could cause a small "shift" in
// the texture coordinates when upscaling
if (idl.du_dy == 0 && (int32_t)idl.du_dx > 0) {
ig.u -= (1 << (COORD_FBS - 1 - upscale_shift));
}
if (idl.dv_dx == 0 && (int32_t)idl.dv_dy > 0) {
ig.v -= (1 << (COORD_FBS - 1 - upscale_shift));
}
}
ig.r = COORD_MF_INT(vertices[iggvi].r);
ig.g = COORD_MF_INT(vertices[iggvi].g);
ig.b = COORD_MF_INT(vertices[iggvi].b);