mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-11-24 00:21:31 +11:00
65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
/* pack_2to1_f and unpack_1to2_float
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* Take 2 floats and pack them into one
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* #pragma format R32G32B32A32_SFLOAT needed
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* The brighter color is lost.
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*/
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#define pack_floats_clamp 0.996078431372549 //1-(1/255)
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#define pack_floats_precision 255.0
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float pack_2to1_f(vec2 in_float){
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//Clamp and round to 1/255 needed:
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in_float = min(in_float,pack_floats_clamp);
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in_float = floor(in_float*255.0)/255.0;
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return in_float.x*pack_floats_precision + in_float.y;
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}
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vec2 unpack_1to2_float(float f){
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float fr = fract(f);
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float fg = floor(f)/pack_floats_precision;
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return vec2(fr,fg);
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}
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//pack 2 vec3 into one
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vec3 pack_2to1_vec3(vec3 v1, vec3 v2) {
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return vec3(
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pack_2to1_f(vec2(v1.r,v2.r)),
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pack_2to1_f(vec2(v1.g,v2.g)),
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pack_2to1_f(vec2(v1.b,v2.b))
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);
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}
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void unpack_1to2_vec3(in vec3 v, out vec3 v1, out vec3 v2) {
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vec2 t;
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t.xy = unpack_1to2_float(v.r);
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v1.r = t.x;
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v2.r = t.y;
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t.xy = unpack_1to2_float(v.g);
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v1.g = t.x;
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v2.g = t.y;
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t.xy = unpack_1to2_float(v.b);
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v1.b = t.x;
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v2.b= t.y;
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}
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/* packColor and unpackColor
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* Take a vec3 and pack them into one float
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* #pragma format R32G32B32A32_SFLOAT needed
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* The brighter colors (2) are lost.
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*/
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#define mul_low 65025.0 //(pow(255.0,2.0))
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#define mul_mid 16581375.0 //(pow(255.0,3.0))
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#define mul_hi 4228250625.0 //(pow(255.0,4.0))
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#define pack_color_clamp 0.992156862745098 // 1.0-(2.0/255)
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float packColor(vec3 color) {
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color = clamp(color,0.0, pack_color_clamp);
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color = floor(color*255.0)/255.0;
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return (color.b * mul_low) + (color.g * mul_mid) + (color.r * mul_hi) ;
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}
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vec3 unpackColor(float result) {
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float hi = floor(result/mul_mid)*mul_mid;
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float mid = floor((result - hi)/mul_low)*mul_low;
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float low = result - hi - mid;
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return vec3(hi/mul_hi, mid/mul_mid, low/mul_low);
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}
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