41 lines
1.6 KiB
GLSL
41 lines
1.6 KiB
GLSL
/* _______________ ,----------------------------------------------------------------.
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//`````````````\\ \ \
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//~~~~~~~~~~~~~~~\\ \ by @ohsqueezy & @sleepin \
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//=================\\ \ [ohsqueezy.itch.io] [sleepin.itch.io] \
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// \\ \ \
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// \\ \ code released under the zlib license [git.nugget.fun/pudding] \
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// ☆ GUNKISS ☆ \\ \ \
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//_________________________\\ `---------------------------------------------------------------*/
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#version 130
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in vec2 uv;
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uniform sampler2D base_texture;
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uniform vec3 blend_min_hsv;
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uniform float time;
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uniform bool scroll = false;
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/* from http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl, licensed under WTFPL */
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vec3 hsv2rgb(vec3 c)
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{
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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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void main(void)
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{
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if (scroll)
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{
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ivec2 texture_size = textureSize(base_texture, 0);
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float speed = time * 35.0;
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gl_FragColor = texelFetch(base_texture, ivec2(mod(vec2(gl_FragCoord.x + speed, gl_FragCoord.y - speed), texture_size)), 0);
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}
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else
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{
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gl_FragColor = texture(base_texture, uv);
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}
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/* apply blending, leaving alpha unchanged */
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gl_FragColor.xyz = min(gl_FragColor.xyz, hsv2rgb(blend_min_hsv));
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}
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