mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-09-21 12:52:43 +02:00
83 lines
2.3 KiB
GLSL
83 lines
2.3 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 float strength;
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uniform float radius;
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uniform int sampleMode;
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/////////////// 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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/////////////// SAMPLING ///////////////
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vec4 sampleTexture(vec2 pos) {
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if(pos.x >= 0. && pos.y >= 0. && pos.x <= 1. && pos.y <= 1.)
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return texture2Dintp(gm_BaseTexture, pos);
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if(sampleMode == 0)
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return vec4(0.);
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if(sampleMode == 1)
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return texture2Dintp(gm_BaseTexture, clamp(pos, 0., 1.));
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if(sampleMode == 2)
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return texture2Dintp(gm_BaseTexture, fract(pos));
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return vec4(0.);
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}
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void main() {
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vec2 pixelPos = v_vTexcoord * dimension;
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vec2 to = pixelPos - center;
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float dis = distance(center, pixelPos);
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float eff = 1. - clamp(dis / radius, 0., 1.);
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float ang = atan(to.y, to.x) + eff * strength;
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vec2 tex = center + vec2(cos(ang), sin(ang)) * distance(center, pixelPos);
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gl_FragColor = sampleTexture( tex / dimension );
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}
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