29 lines
799 B
GLSL
29 lines
799 B
GLSL
// simple gradient map
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vec4 BilinearSample( in sampler2D tex, in vec2 pos, in vec2 size, in vec2 pxsize )
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{
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vec2 f = fract(pos*size);
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pos += (.5-f)*pxsize;
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vec4 p0q0 = texture(tex,pos);
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vec4 p1q0 = texture(tex,pos+vec2(pxsize.x,0));
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vec4 p0q1 = texture(tex,pos+vec2(0,pxsize.y));
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vec4 p1q1 = texture(tex,pos+vec2(pxsize.x,pxsize.y));
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vec4 pInterp_q0 = mix(p0q0,p1q0,f.x);
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vec4 pInterp_q1 = mix(p0q1,p1q1,f.x);
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return mix(pInterp_q0,pInterp_q1,f.y);
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}
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vec3 GradientMap( in float gray )
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{
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vec2 size = vec2(512.,4.);
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vec2 pxsize = 1./size;
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return BilinearSample(gradtex,vec2(gray/2.+.25,0),size,pxsize).rgb;
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}
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void SetupMaterial( inout Material mat )
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{
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vec4 base = getTexel(vTexCoord.st);
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base.rgb = GradientMap(base.x);
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mat.Base = base;
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mat.Normal = ApplyNormalMap(vTexCoord.st);
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}
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