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The vertex shader is run before clipping is done. If fogging values are calculated and clamped in the vertex shader it can interpolate bad values, since the range has been truncated. This happens if the polys overlap the near plane. The solution to clamp the values in the fragment shader. This fixes a bunch of fogging errors I long thought were transparency related errors in the ocean hunter.

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This commit is contained in:
Ian Curtis 2017-11-20 22:21:15 +00:00
parent bc7f1e9fac
commit bddc86aba9
1 changed files with 2 additions and 2 deletions
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4
Src/Graphics/New3D/R3DShader.cpp
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@ -44,7 +44,7 @@ void main(void)
fsViewVertex = vec3(gl_ModelViewMatrix * inVertex);
fsViewNormal = (mat3(gl_ModelViewMatrix) * inNormal) / modelScale;
float z = -fsViewVertex.z;
fsFogFactor = fogIntensity * clamp(fogStart + z * fogDensity, 0.0, 1.0);
fsFogFactor = fogIntensity * (fogStart + z * fogDensity);
fsDiscard = CalcBackFace(fsViewVertex);
fsColor = inColour;
@ -152,7 +152,7 @@ void main()
discard; //emulate back face culling here
}
fogData = vec4(fogColour.rgb * fogAmbient, fsFogFactor);
fogData = vec4(fogColour.rgb * fogAmbient, clamp(fsFogFactor,0.0,1.0));
tex1Data = vec4(1.0, 1.0, 1.0, 1.0);
if(textureEnabled) {