119 lines
3.6 KiB
GLSL
119 lines
3.6 KiB
GLSL
float rand(vec2 x) {
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return fract(cos(dot(x, vec2(13.9898, 8.141))) * 43758.5453);
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}
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vec2 rand2(vec2 x) {
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return fract(cos(vec2(dot(x, vec2(13.9898, 8.141)),
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dot(x, vec2(3.4562, 17.398)))) * 43758.5453);
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}
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vec3 rand3(vec2 x) {
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return fract(cos(vec3(dot(x, vec2(13.9898, 8.141)),
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dot(x, vec2(3.4562, 17.398)),
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dot(x, vec2(13.254, 5.867)))) * 43758.5453);
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}
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vec3 blend_normal(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*c1 + (1.0-opacity)*c2;
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}
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vec3 blend_dissolve(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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if (rand(uv) < opacity) {
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return c1;
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} else {
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return c2;
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}
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}
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vec3 blend_multiply(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*c1*c2 + (1.0-opacity)*c2;
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}
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vec3 blend_screen(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*(1.0-(1.0-c1)*(1.0-c2)) + (1.0-opacity)*c2;
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}
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float blend_overlay_f(float c1, float c2) {
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return (c1 < 0.5) ? (2.0*c1*c2) : (1.0-2.0*(1.0-c1)*(1.0-c2));
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}
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vec3 blend_overlay(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*vec3(blend_overlay_f(c1.x, c2.x), blend_overlay_f(c1.y, c2.y), blend_overlay_f(c1.z, c2.z)) + (1.0-opacity)*c2;
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}
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vec3 blend_hard_light(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*0.5*(c1*c2+blend_overlay(uv, c1, c2, 1.0)) + (1.0-opacity)*c2;
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}
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float blend_soft_light_f(float c1, float c2) {
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return (c2 < 0.5) ? (2.0*c1*c2+c1*c1*(1.0-2.0*c2)) : 2.0*c1*(1.0-c2)+sqrt(c1)*(2.0*c2-1.0);
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}
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vec3 blend_soft_light(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*vec3(blend_soft_light_f(c1.x, c2.x), blend_soft_light_f(c1.y, c2.y), blend_soft_light_f(c1.z, c2.z)) + (1.0-opacity)*c2;
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}
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float blend_burn_f(float c1, float c2) {
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return (c1==0.0)?c1:max((1.0-((1.0-c2)/c1)),0.0);
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}
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vec3 blend_burn(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*vec3(blend_burn_f(c1.x, c2.x), blend_burn_f(c1.y, c2.y), blend_burn_f(c1.z, c2.z)) + (1.0-opacity)*c2;
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}
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float blend_dodge_f(float c1, float c2) {
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return (c1==1.0)?c1:min(c2/(1.0-c1),1.0);
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}
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vec3 blend_dodge(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*vec3(blend_dodge_f(c1.x, c2.x), blend_dodge_f(c1.y, c2.y), blend_dodge_f(c1.z, c2.z)) + (1.0-opacity)*c2;
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}
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vec3 blend_lighten(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*max(c1, c2) + (1.0-opacity)*c2;
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}
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vec3 blend_darken(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*min(c1, c2) + (1.0-opacity)*c2;
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}
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vec3 blend_difference(vec2 uv, vec3 c1, vec3 c2, float opacity) {
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return opacity*clamp(c2-c1, vec3(0.0), vec3(1.0)) + (1.0-opacity)*c2;
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}
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vec2 transform(vec2 uv, vec2 translate, float rotate, vec2 scale) {
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vec2 rv;
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uv -= vec2(0.5);
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rv.x = cos(rotate)*uv.x + sin(rotate)*uv.y;
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rv.y = -sin(rotate)*uv.x + cos(rotate)*uv.y;
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rv /= scale;
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rv += vec2(0.5);
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rv -= translate;
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return rv;
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}
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vec2 transform_repeat(vec2 uv, vec2 translate, float rotate, vec2 scale) {
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return fract(transform(uv, translate, rotate, scale));
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}
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vec2 transform_norepeat(vec2 uv, vec2 translate, float rotate, vec2 scale) {
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return clamp(transform(uv, translate, rotate, scale), vec2(0.0), vec2(1.0));
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}
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// From http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl
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vec3 rgb2hsv(vec3 c) {
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vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
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vec4 p = c.g < c.b ? vec4(c.bg, K.wz) : vec4(c.gb, K.xy);
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vec4 q = c.r < p.x ? vec4(p.xyw, c.r) : vec4(c.r, p.yzx);
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float d = q.x - min(q.w, q.y);
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float e = 1.0e-10;
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return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
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}
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vec3 hsv2rgb(vec3 c) {
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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