31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
vec2 offsetmap(sampler2D normtex, vec2 base, vec3 eyevector)
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{
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#if !defined(OFFSETMAPPING_SCALE)
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#define OFFSETMAPPING_SCALE 1.0
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#endif
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if (false)//(RELIEFMAPPING)
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{
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float i, f;
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vec3 OffsetVector = vec3(normalize(eyevector.xyz).xy * cvar_r_glsl_offsetmapping_scale * OFFSETMAPPING_SCALE * vec2(-1.0, 1.0), -1.0);
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vec3 RT = vec3(vec2(base.xy/* - OffsetVector.xy*OffsetMapping_Bias*/), 1.0);
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OffsetVector /= 10.0;
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for(i = 1.0; i < 10.0; ++i)
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RT += OffsetVector * step(texture2D(normtex, RT.xy).a, RT.z);
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for(i = 0.0, f = 1.0; i < 5.0; ++i, f *= 0.5)
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RT += OffsetVector * (step(texture2D(normtex, RT.xy).a, RT.z) * f - 0.5 * f);
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return RT.xy;
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}
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else if (OFFSETMAPPING)
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{
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vec2 OffsetVector = normalize(eyevector).xy * cvar_r_glsl_offsetmapping_scale * OFFSETMAPPING_SCALE * vec2(-1.0, 1.0);
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vec2 tc = base;
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tc += OffsetVector;
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OffsetVector *= 0.333;
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tc -= OffsetVector * texture2D(normtex, tc).w;
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tc -= OffsetVector * texture2D(normtex, tc).w;
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tc -= OffsetVector * texture2D(normtex, tc).w;
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return tc;
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}
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return base;
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}
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