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OpenGL2: Flip normals for backfacing triangles.

Browse source 
https://github.com/ioquake/ioq3/issues/513
This commit is contained in:
James Canete 2021-07-20 13:51:19 -07:00
parent b8be5a8bd7
commit bc8737d707
1 changed files with 4 additions and 3 deletions
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7
code/renderergl2/glsl/lightall_fp.glsl
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@ -264,7 +264,8 @@ void main()
float NL, NH, NE, EH, attenuation;
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
mat3 tangentToWorld = mat3(var_Tangent.xyz, var_Bitangent.xyz, var_Normal.xyz);
vec3 surfNormal = (!gl_FrontFacing ? var_Normal : -var_Normal).xyz;
mat3 tangentToWorld = mat3(var_Tangent.xyz, var_Bitangent.xyz, surfNormal);
viewDir = vec3(var_Normal.w, var_Tangent.w, var_Bitangent.w);
E = normalize(viewDir);
#endif
@ -335,7 +336,7 @@ void main()
N.z = sqrt(clamp((0.25 - N.x * N.x) - N.y * N.y, 0.0, 1.0));
N = tangentToWorld * N;
#else
N = var_Normal.xyz;
N = surfNormal;
#endif
N = normalize(N);
@ -361,7 +362,7 @@ void main()
#if !defined(USE_LIGHT_VECTOR)
ambientColor = lightColor;
float surfNL = clamp(dot(var_Normal.xyz, L), 0.0, 1.0);
float surfNL = clamp(dot(surfNormal, L), 0.0, 1.0);
// reserve 25% ambient to avoid black areas on normalmaps
lightColor *= 0.75;