Teejoon
21 lines
814 B
GLSL
21 lines
814 B
GLSL
#define NORMAL_DDS 1
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#define NORMAL_PNG 2
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vec3 NormalMapValue(vec2 textureCoordinate, sampler2D normalMap, int normalTextureType){
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if(normalTextureType == NORMAL_DDS){
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vec3 normal;
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normal.xy = texture(normalMap, textureCoordinate).wy * 2.0 - vec2(1.0);
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normal.z = sqrt(1.0 - clamp(dot(normal.xy, normal.xy), 0.0, 1.0));
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return normal;
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} else {
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//should be PNG or anything that doesn't need special support
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return texture(normalMap, textureCoordinate).xyz * 2.0 - vec3(1.0);
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}
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}
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vec4 CalcNormalMappedValue(vec3 normal, vec3 tangent, vec3 bitangent, vec2 textureCoordinate, sampler2D normalMap, int normalTextureType)
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{
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mat3 TBN = mat3(tangent, bitangent, normal);
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vec3 NormalMap = NormalMapValue(textureCoordinate, normalMap, normalTextureType);
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return vec4(TBN * normalize(NormalMap), 0.0);
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} |