53 lines
1.4 KiB
GLSL
53 lines
1.4 KiB
GLSL
uniform float blueLmn[9];
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uniform float greenLmn[9];
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uniform float redLmn[9];
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uniform sampler2D ntex;
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uniform mat4 TransposeViewMatrix;
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#if __VERSION__ >= 130
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in vec2 uv;
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out vec4 Diff;
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out vec4 Spec;
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#else
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varying vec2 uv;
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#define Diff gl_FragData[0]
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#define Spec gl_FragData[1]
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#endif
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vec3 DecodeNormal(vec2 n)
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{
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float z = dot(n, n) * 2. - 1.;
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vec2 xy = normalize(n) * sqrt(1. - z * z);
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return vec3(xy,z);
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}
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mat4 getMatrix(float L[9])
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{
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float c1 = 0.429043, c2 = 0.511664, c3 = 0.743125, c4 = 0.886227, c5 = 0.247708;
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return mat4(
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c1 * L[8] /*L22*/, c1 * L[4] /*L2-2*/, c1 * L[7] /*L21*/, c2 * L[3] /*L11*/,
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c1 * L[4], - c1 * L[8], c1 * L[5] /*L2-1*/, c2 * L[1] /*L1-1*/,
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c1 * L[7], c1 * L[5], c3 * L[6] /*L20*/, c2 * L[2] /*L10*/,
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c2 * L[3], c2 * L[1], c2 * L[2], c4 * L[0] /*L00*/ - c5 * L[6]
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);
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}
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void main(void)
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{
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vec3 normal = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
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// Convert normal in world space (where SH coordinates were computed)
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vec4 extendednormal = TransposeViewMatrix * vec4(normal, 1.);
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extendednormal.w = 1.;
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mat4 rmat = getMatrix(redLmn);
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mat4 gmat = getMatrix(greenLmn);
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mat4 bmat = getMatrix(blueLmn);
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float r = dot(extendednormal, rmat * extendednormal);
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float g = dot(extendednormal, gmat * extendednormal);
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float b = dot(extendednormal, bmat * extendednormal);
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Diff = 0.25 * vec4(r, g, b, .1);
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Spec = vec4(0.);
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}
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