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nv2a: Clamp fog factor to valid float range

This commit is contained in:
Erik Abair 2025-06-23 11:55:35 -07:00 committed by mborgerson
parent 1343d5873f
commit 634577c753
1 changed files with 9 additions and 1 deletions
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10
hw/xbox/nv2a/pgraph/glsl/vsh.c
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@ -53,6 +53,8 @@ MString *pgraph_gen_vsh_glsl(const ShaderState *state, bool prefix_outputs)
GLSL_DEFINE(texMat2, GLSL_C_MAT4(NV_IGRAPH_XF_XFCTX_T2MAT))
GLSL_DEFINE(texMat3, GLSL_C_MAT4(NV_IGRAPH_XF_XFCTX_T3MAT))
"\n"
"#define FLOAT_MAX uintBitsToFloat(0x7F7FFFFFu)\n"
"\n"
"vec4 oPos = vec4(0.0,0.0,0.0,1.0);\n"
"vec4 oD0 = vec4(0.0,0.0,0.0,1.0);\n"
@ -244,7 +246,13 @@ MString *pgraph_gen_vsh_glsl(const ShaderState *state, bool prefix_outputs)
break;
}
mstring_append(body, " oFog = NaNToOne(vec4(fogFactor));\n");
/* Fog is clamped to min/max normal float values here to match HW
* interpolation. It is then clamped to [0,1] in the pixel shader.
*/
// clang-format off
mstring_append(body,
" oFog = clamp(NaNToOne(vec4(fogFactor)), -FLOAT_MAX, FLOAT_MAX);\n");
// clang-format on
} else {
/* FIXME: Is the fog still calculated / passed somehow?!
*/