mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-09-21 12:52:43 +02:00
87 lines
2.5 KiB
GLSL
87 lines
2.5 KiB
GLSL
//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform vec2 dimension;
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uniform vec2 center;
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uniform vec2 strength;
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uniform int strengthUseSurf;
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uniform sampler2D strengthSurf;
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#region /////////////// SAMPLING ///////////////
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const float PI = 3.14159265358979323846;
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uniform int interpolation;
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uniform vec2 sampleDimension;
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const int RSIN_RADIUS = 1;
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float sinc ( float x ) { return x == 0.? 1. : sin(x * PI) / (x * PI); }
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vec4 texture2D_rsin( sampler2D texture, vec2 uv ) {
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vec2 tx = 1.0 / sampleDimension;
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vec2 p = uv * sampleDimension - vec2(0.5);
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vec4 sum = vec4(0.0);
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float weights = 0.;
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for (int x = -RSIN_RADIUS; x <= RSIN_RADIUS; x++)
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for (int y = -RSIN_RADIUS; y <= RSIN_RADIUS; y++) {
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float a = length(vec2(float(x), float(y))) / float(RSIN_RADIUS);
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if(a > 1.) continue;
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float w = sinc(a * PI * tx.x) * sinc(a * PI * tx.y);
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vec2 offset = vec2(float(x), float(y)) * tx;
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vec4 sample = texture2D(texture, (p + offset + vec2(0.5)) / sampleDimension);
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sum += w * sample;
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weights += w;
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}
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return sum / weights;
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}
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vec4 texture2D_bicubic( sampler2D texture, vec2 uv ) {
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uv = uv * sampleDimension + 0.5;
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vec2 iuv = floor( uv );
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vec2 fuv = fract( uv );
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uv = iuv + fuv * fuv * (3.0 - 2.0 * fuv);
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uv = (uv - 0.5) / sampleDimension;
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return texture2D( texture, uv );
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}
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vec4 texture2Dintp( sampler2D texture, vec2 uv ) {
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if(interpolation == 2) return texture2D_bicubic( texture, uv );
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else if(interpolation == 3) return texture2D_rsin( texture, uv );
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return texture2D( texture, uv );
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}
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#endregion /////////////// SAMPLING ///////////////
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void main() {
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float str = strength.x;
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if(strengthUseSurf == 1) {
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vec4 _vMap = texture2Dintp( strengthSurf, v_vTexcoord );
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str = mix(strength.x, strength.y, (_vMap.r + _vMap.g + _vMap.b) / 3.);
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}
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vec2 texel = 1.0 / dimension;
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vec2 coords = (v_vTexcoord - center / dimension) * 2.0;
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float coordDot = dot(coords, coords);
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vec2 precompute = str * coordDot * coords;
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vec2 uvR = v_vTexcoord - texel.xy * precompute;
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vec2 uvB = v_vTexcoord + texel.xy * precompute;
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vec4 color;
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color.r = texture2Dintp(gm_BaseTexture, uvR).r;
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color.g = texture2Dintp(gm_BaseTexture, v_vTexcoord).g;
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color.b = texture2Dintp(gm_BaseTexture, uvB).b;
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color.a = texture2Dintp(gm_BaseTexture, v_vTexcoord).a +
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texture2Dintp(gm_BaseTexture, uvR).a +
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texture2Dintp(gm_BaseTexture, uvB).a;
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gl_FragColor = color;
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}
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