mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-11-15 06:53:59 +01:00
116 lines
3.2 KiB
GLSL
116 lines
3.2 KiB
GLSL
#define MAX_STRENGTH 64.
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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 sampler2D slopeMap;
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uniform vec2 slopeMapDim;
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uniform float stepSize;
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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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uniform int sampleMode;
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vec2 tx;
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vec2 txMap;
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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
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vec4 sampleTexture(sampler2D texture, vec2 pos) { #region
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if(pos.x >= 0. && pos.y >= 0. && pos.x <= 1. && pos.y <= 1.)
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return texture2Dintp(texture, pos);
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if(sampleMode == 0) return vec4(0.);
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else if(sampleMode == 1) return texture2Dintp(texture, clamp(pos, 0., 1.));
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else if(sampleMode == 2) return texture2Dintp(texture, fract(pos));
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else if(sampleMode == 3) return vec4(vec3(0.), 1.);
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return vec4(0.);
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} #endregion
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float sampleBright(vec2 pos) { vec4 c = sampleTexture(slopeMap, pos); return (c.r + c.g + c.b) / 3.; }
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vec2 sampleSlope(vec2 pos) { #region
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float h0 = sampleBright(pos + vec2(-txMap.x, 0.));
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float h1 = sampleBright(pos + vec2( txMap.x, 0.));
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float h2 = sampleBright(pos + vec2(0., -txMap.y));
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float h3 = sampleBright(pos + vec2(0., txMap.y));
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return vec2(h1 - h0, h3 - h2);
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} #endregion
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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 = texture2D( 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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tx = 1. / dimension;
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txMap = 1. / slopeMapDim;
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float alpha = 0.;
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vec4 colr = vec4(0.);
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vec2 pos = v_vTexcoord;
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for(float i = 0.; i < MAX_STRENGTH; i++) {
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if(i > str) break;
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float str = 1. - (i / str);
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vec4 c = sampleTexture(gm_BaseTexture, pos);
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colr += c * str;
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alpha += str;
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vec2 slp = sampleSlope(pos);
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pos += slp * stepSize;
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}
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gl_FragColor = colr / alpha;
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} |