Pixel-Composer/shaders/sh_grid_noise/sh_grid_noise.fsh
2023-01-01 08:06:02 +07:00

39 lines
837 B
GLSL

//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;
uniform vec2 dimension;
uniform vec2 position;
uniform vec2 scale;
uniform float seed;
uniform float shift;
uniform int shiftAxis;
uniform int useSampler;
float random (in vec2 st) {
return fract(sin(dot(st.xy, vec2(12.9898 * seed, 78.233))) * 43758.5453123);
}
void main() {
vec2 st = v_vTexcoord - position / dimension;
vec2 pos = vec2(st * scale);
if(shiftAxis == 0)
pos.x += random(vec2(0., floor(pos.y))) * shift;
else if(shiftAxis == 1)
pos.y += random(vec2(0., floor(pos.x))) * shift;
vec2 i = floor(pos);
float n = random(i);
if(useSampler == 0)
gl_FragColor = vec4(vec3(n), 1.0);
else {
vec2 samPos = floor(pos) / scale + 0.5 / scale;
gl_FragColor = texture2D( gm_BaseTexture, samPos );
}
}