mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-09-21 21:01:20 +02:00
96 lines
2.4 KiB
GLSL
96 lines
2.4 KiB
GLSL
//
|
|
// Simple passthrough fragment shader
|
|
//
|
|
varying vec2 v_vTexcoord;
|
|
varying vec4 v_vColour;
|
|
|
|
uniform vec2 center;
|
|
uniform vec2 dimension;
|
|
uniform float strength;
|
|
uniform int sampleMode;
|
|
|
|
#define ITERATION 64.
|
|
|
|
/////////////// SAMPLING ///////////////
|
|
|
|
const float PI = 3.14159265358979323846;
|
|
uniform int interpolation;
|
|
uniform vec2 sampleDimension;
|
|
|
|
const int RSIN_RADIUS = 1;
|
|
|
|
float sinc ( float x ) { return x == 0.? 1. : sin(x * PI) / (x * PI); }
|
|
|
|
vec4 texture2D_rsin( sampler2D texture, vec2 uv ) {
|
|
vec2 tx = 1.0 / sampleDimension;
|
|
vec2 p = uv * sampleDimension - vec2(0.5);
|
|
|
|
vec4 sum = vec4(0.0);
|
|
float weights = 0.;
|
|
|
|
for (int x = -RSIN_RADIUS; x <= RSIN_RADIUS; x++)
|
|
for (int y = -RSIN_RADIUS; y <= RSIN_RADIUS; y++) {
|
|
float a = length(vec2(float(x), float(y))) / float(RSIN_RADIUS);
|
|
if(a > 1.) continue;
|
|
float w = sinc(a * PI * tx.x) * sinc(a * PI * tx.y);
|
|
vec2 offset = vec2(float(x), float(y)) * tx;
|
|
vec4 sample = texture2D(texture, (p + offset + vec2(0.5)) / sampleDimension);
|
|
sum += w * sample;
|
|
weights += w;
|
|
}
|
|
|
|
return sum / weights;
|
|
}
|
|
|
|
vec4 texture2D_bicubic( sampler2D texture, vec2 uv ) {
|
|
uv = uv * sampleDimension + 0.5;
|
|
vec2 iuv = floor( uv );
|
|
vec2 fuv = fract( uv );
|
|
uv = iuv + fuv * fuv * (3.0 - 2.0 * fuv);
|
|
uv = (uv - 0.5) / sampleDimension;
|
|
return texture2D( texture, uv );
|
|
}
|
|
|
|
vec4 texture2Dintp( sampler2D texture, vec2 uv ) {
|
|
if(interpolation == 2) return texture2D_bicubic( texture, uv );
|
|
else if(interpolation == 3) return texture2D_rsin( texture, uv );
|
|
return texture2D( texture, uv );
|
|
}
|
|
|
|
/////////////// SAMPLING ///////////////
|
|
|
|
vec4 sampleTexture(vec2 pos) {
|
|
if(pos.x >= 0. && pos.y >= 0. && pos.x <= 1. && pos.y <= 1.)
|
|
return texture2Dintp(gm_BaseTexture, pos);
|
|
|
|
if(sampleMode == 0)
|
|
return vec4(0.);
|
|
if(sampleMode == 1)
|
|
return texture2Dintp(gm_BaseTexture, clamp(pos, 0., 1.));
|
|
if(sampleMode == 2)
|
|
return texture2Dintp(gm_BaseTexture, fract(pos));
|
|
|
|
return vec4(0.);
|
|
}
|
|
|
|
void main() {
|
|
vec2 pxPos = v_vTexcoord * dimension;
|
|
vec2 pxCen = center * dimension;
|
|
vec2 vecPc = pxPos - pxCen;
|
|
|
|
float angle = atan(vecPc.y, vecPc.x);
|
|
float dist = length(vecPc);
|
|
vec4 clr = vec4(0.);
|
|
float weight = 0.;
|
|
|
|
for(float i = -strength; i <= strength; i++) {
|
|
float ang = angle + i / 100.;
|
|
vec4 col = sampleTexture((pxCen + vec2(cos(ang), sin(ang)) * dist) / dimension);
|
|
|
|
clr += col;
|
|
weight += col.a;
|
|
}
|
|
|
|
gl_FragColor = clr / weight;
|
|
}
|