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wined3d: Do not clamp fog in the VS.

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NVidia and WARP clamp before interpolation in the oFog case; AMD clamps only
after interpolation (which we also do).

On the other hand, test_fog() proves that clamping should not be done before
interpolation in the FFP case, for any driver.

In order to emulate an FFP vertex shader with a real compiled shader, we need to
avoid clamping before interpolation, choosing the AMD behaviour here.
This commit is contained in:
Elizabeth Figura 2024-10-31 12:27:53 -05:00 committed by Alexandre Julliard
parent a5de8d85d3
commit b02b73673b
Notes: Alexandre Julliard 2024-11-13 22:30:11 +01:00 
Approved-by: Jan Sikorski (@jsikorski)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/wine/merge_requests/6756
1 changed files with 1 additions and 1 deletions
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2
dlls/wined3d/glsl_shader.c
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@ -7366,7 +7366,7 @@ static GLuint shader_glsl_generate_vs3_rasterizer_input_setup(struct shader_glsl
}
else if (shader_match_semantic(semantic_name, WINED3D_DECL_USAGE_FOG))
{
shader_addline(buffer, "%s = clamp(outputs[%u].%c, 0.0, 1.0);\n",
shader_addline(buffer, "%s = outputs[%u].%c;\n",
legacy_syntax ? "gl_FogFragCoord" : "ffp_varying_fogcoord",
output->register_idx, reg_mask[1]);
}