76 lines
2.1 KiB
GLSL
76 lines
2.1 KiB
GLSL
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// Shader based on work by Fabien Sanglard
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// Released under the terms of CC-BY 3.0
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uniform sampler2D BumpTex1; // Normal map 1
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uniform sampler2D BumpTex2; // Normal map 2
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uniform sampler2D DecalTex; //The texture
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uniform vec2 delta1;
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uniform vec2 delta2;
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varying vec3 lightVec;
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varying vec3 halfVec;
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varying vec3 eyeVec;
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varying vec4 coord;
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uniform vec4 fogColor;
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uniform float fogFrom;
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uniform float fogTo;
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void main()
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{
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// lookup normal from normal map, move from [0,1] to [-1, 1] range, normalize
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vec3 normal = 2.0 * texture2D (BumpTex1, gl_TexCoord[0].st + delta1).rgb - 1.0;
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vec3 normal2 = 2.0 * texture2D (BumpTex2, gl_TexCoord[0].st + delta2).rgb - 1.0;
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// scale normals
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normal.y = 4.0*normal.y;
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normal2.y = 4.0*normal2.y;
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normal = (normalize(normal) + normalize(normal2))/2.0;
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// compute diffuse lighting
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float lamberFactor = max (dot (lightVec, normal), 0.0);
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vec4 diffuseMaterial;
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vec4 diffuseLight;
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diffuseMaterial = texture2D (DecalTex, gl_TexCoord[0].st + vec2(delta1.x, 0.0));
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diffuseLight = vec4(1.0, 1.0, 1.0, 1.0);
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//if (lamberFactor < 0.7)
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//{
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// lamberFactor = 0.0;
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//}
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gl_FragColor = diffuseMaterial * (0.3 + lamberFactor*0.7);
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// specular (phong)
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vec3 R = normalize(reflect(lightVec, normal));
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float specular = max(dot(R,eyeVec),0.0);
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if (specular > 0.0)
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{
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// weak specular
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specular = specular*specular;
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specular = specular*specular;
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float specular_weak = specular*0.05;
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gl_FragColor += vec4(specular_weak, specular_weak, specular_weak, 0.0);
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// strong specular
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specular = specular*specular;
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float specular_strong = specular*0.3;
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gl_FragColor += vec4(specular_strong, specular_strong, specular_strong, 0.0);
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}
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if (coord.z > fogTo)
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{
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gl_FragColor = fogColor;
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}
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else if (coord.z > fogFrom)
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{
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float fogIntensity = (coord.z - fogFrom) / (fogTo - fogFrom);
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gl_FragColor = fogIntensity*fogColor + (1.0 - fogIntensity)*gl_FragColor;
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}
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}
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