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nv2a: Match HW behavior when dealing with infinite fog coord

This commit is contained in:
Erik Abair 2022-01-16 21:57:37 -08:00 committed by mborgerson
parent 3fd15218c7
commit b3f56db428
1 changed files with 17 additions and 6 deletions
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23
hw/xbox/nv2a/shaders.c
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@ -793,14 +793,25 @@ STRUCT_VERTEX_DATA);
case FOG_MODE_LINEAR_ABS:
/* f = (end - d) / (end - start)
* fogParam[1] = 1 / (end - start)
* fogParam[0] = 1 + end * fogParam[1];
* fogParam[1] = -1 / (end - start)
* fogParam[0] = 1 - end * fogParam[1];
*/
mstring_append(body,
" if (isinf(fogDistance)) {\n"
" fogDistance = 0.0;\n"
" }\n"
);
mstring_append(body, " float fogFactor = fogParam[0] + fogDistance * fogParam[1];\n");
mstring_append(body, " fogFactor -= 1.0;\n"); /* FIXME: WHHYYY?!! */
mstring_append(body, " fogFactor -= 1.0;\n");
break;
case FOG_MODE_EXP:
mstring_append(body,
" if (isinf(fogDistance)) {\n"
" fogDistance = 0.0;\n"
" }\n"
);
/* fallthru */
case FOG_MODE_EXP_ABS:
/* f = 1 / (e^(d * density))
@ -809,7 +820,7 @@ STRUCT_VERTEX_DATA);
*/
mstring_append(body, " float fogFactor = fogParam[0] + exp2(fogDistance * fogParam[1] * 16.0);\n");
mstring_append(body, " fogFactor -= 1.5;\n"); /* FIXME: WHHYYY?!! */
mstring_append(body, " fogFactor -= 1.5;\n");
break;
case FOG_MODE_EXP2:
case FOG_MODE_EXP2_ABS:
@ -820,7 +831,7 @@ STRUCT_VERTEX_DATA);
*/
mstring_append(body, " float fogFactor = fogParam[0] + exp2(-fogDistance * fogDistance * fogParam[1] * fogParam[1] * 32.0);\n");
mstring_append(body, " fogFactor -= 1.5;\n"); /* FIXME: WHHYYY?!! */
mstring_append(body, " fogFactor -= 1.5;\n");
break;
default:
assert(false);
@ -836,7 +847,7 @@ STRUCT_VERTEX_DATA);
default:
break;
}
/* FIXME: What about fog alpha?! */
mstring_append(body, " oFog.xyzw = vec4(fogFactor);\n");
} else {
/* FIXME: Is the fog still calculated / passed somehow?!