36 lines
852 B
GLSL
36 lines
852 B
GLSL
layout (location = 0) uniform sampler2D u_tex;
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layout (location = 1) uniform float u_alpha;
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in vec2 v_dp;
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in vec2 v_uv;
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in vec4 v_color;
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out vec4 o_color;
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float rand(in vec2 p) {
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/* https://qiita.com/shimacpyon/items/d15dee44a0b8b3883f76 */
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return fract(sin(dot(p ,vec2(12.9898,78.233))) * 43758.5453);
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}
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float noise(vec2 x) {
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/* https://www.shadertoy.com/view/4dS3Wd */
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vec2 i = floor(x);
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vec2 f = fract(x);
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float a = rand(i);
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float b = rand(i + vec2(1.0, 0.0));
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float c = rand(i + vec2(0.0, 1.0));
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float d = rand(i + vec2(1.0, 1.0));
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vec2 u = f * f * (3.0 - 2.0 * f);
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return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
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}
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void main(void) {
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float t = 1.-pow(1.-u_alpha, 4.);
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float a = texture(u_tex, v_uv).r;
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a *= step(noise(v_dp*10.), t);
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o_color = vec4(v_color.rgb, v_color.a*a*t);
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}
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