Pixel-Composer/shaders/sh_texture_atlas/sh_texture_atlas.fsh
2023-02-23 13:02:19 +07:00

35 lines
777 B
GLSL

//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;
uniform vec2 dimension;
uniform float size;
#define TAU 6.283185307179586
void main() {
vec2 pixelPosition = v_vTexcoord * dimension;
vec4 point = texture2D( gm_BaseTexture, v_vTexcoord );
float tau_div = TAU / 64.;
gl_FragColor = point;
if(point.a < 1.) {
for(float i = 1.; i < size; i++) {
for(float j = 0.; j < 64.; j++) {
float ang = j * tau_div;
vec2 pxs = (pixelPosition + vec2( cos(ang) * i, sin(ang) * i)) / dimension;
if(pxs.x < 0. || pxs.x > 1. || pxs.y < 0. || pxs.y > 1.) continue;
vec4 sam = texture2D( gm_BaseTexture, pxs );
if(sam.a > 0.) {
gl_FragColor = vec4(sam.rgb, 1.);
i = size;
break;
}
}
}
}
}