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Use (experimental) formulas to get correct D3D fog

This commit is contained in:
Jannik Vogel 2015-07-28 17:06:53 +02:00
parent 5291bec473
commit 8ce4cf3dbc
1 changed files with 25 additions and 6 deletions
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31
hw/xbox/nv2a_shaders.c
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@ -279,7 +279,7 @@ static QString* generate_fixed_function(const ShaderState state,
break;
case FOGGEN_PLANAR:
case FOGGEN_ABS_PLANAR:
qstring_append(s, "float fogDistance = dot(fogPlane.xyz,tPosition.xyz)+fogPlane.w;\n");
qstring_append(s, "float fogDistance = dot(fogPlane.xyz, tPosition.xyz) + fogPlane.w;\n");
if (state.foggen == FOGGEN_ABS_PLANAR) {
qstring_append(s, "fogDistance = abs(fogDistance);\n");
}
@ -298,21 +298,40 @@ static QString* generate_fixed_function(const ShaderState state,
break;
}
//FIXME: Do this per pixel?
switch (state.fog_mode) {
case FOG_MODE_LINEAR:
case FOG_MODE_LINEAR_ABS:
qstring_append(s, "float fogFactor = fogDistance * fogParam[1] + fogParam[0];\n");
/* f = (end - d) / (end - start)
* fogParam[1] = 1 / (end - start)
* fogParam[0] = 1 + end * fogParam[1];
*/
qstring_append(s, "float fogFactor = fogParam[0] + fogDistance * fogParam[1];\n");
qstring_append(s, "fogFactor -= 1.0;\n"); /* FIXME: WHHYYY?!! */
break;
case FOG_MODE_EXP:
case FOG_MODE_EXP_ABS:
assert(false); /* FIXME: fogParam[0] and fogParam[0] ?? */
qstring_append(s, "float fogFactor = exp(fogDistance);\n");
/* f = 1 / (e^(d * density))
* fogParam[1] = -density / (2 * ln(256))
* fogParam[0] = 1.5
*/
qstring_append(s, "float fogFactor = fogParam[0] + exp(fogDistance * fogParam[1] * 2.0 * 5.5452);\n");
qstring_append(s, "fogFactor -= 1.5;\n"); /* FIXME: WHHYYY?!! */
break;
case FOG_MODE_EXP2:
case FOG_MODE_EXP2_ABS:
assert(false); /* FIXME: fogParam[0] and fogParam[0] ?? */
qstring_append(s, "float fogFactor = exp(fogDistance * fogDistance);\n");
/* f = 1 / (e^((d * density)^2))
* fogParam[1] = -density / (2 * sqrt(ln(256)))
* fogParam[0] = 1.5
*/
qstring_append(s, "float fogFactor = fogParam[0] + exp(-fogDistance * fogDistance * fogParam[1] * fogParam[1] * 4.0 * 5.5452);\n");
qstring_append(s, "fogFactor -= 1.5;\n"); /* FIXME: WHHYYY?!! */
break;
default:
assert(false);