39 lines
1.1 KiB
GLSL
39 lines
1.1 KiB
GLSL
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// IMPORTANT: This shader needs to be compiled out-of-band to SPIR-V
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// See: https://github.com/parasyte/pixels/issues/9
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#version 450
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layout(location = 0) in vec2 v_TexCoord;
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layout(location = 0) out vec4 outColor;
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layout(set = 0, binding = 0) uniform texture2D t_Color;
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layout(set = 0, binding = 1) uniform sampler s_Color;
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layout(set = 0, binding = 2) uniform Locals {
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float u_Time;
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};
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#define PI 3.1415926535897932384626433832795
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#define TAU PI * 2.0
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// Offset the circular time input so it is never 0
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#define BIAS 0.2376
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// Random functions based on https://thebookofshaders.com/10/
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#define RANDOM_SCALE 43758.5453123
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#define RANDOM_X 12.9898
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#define RANDOM_Y 78.233
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float random(float x) {
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return fract(sin(x) * RANDOM_SCALE);
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}
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float random_vec2(vec2 st) {
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return random(dot(st.xy, vec2(RANDOM_X, RANDOM_Y)));
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}
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void main() {
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vec4 sampledColor = texture(sampler2D(t_Color, s_Color), v_TexCoord.xy);
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vec3 noiseColor = vec3(random_vec2(v_TexCoord.xy * vec2(mod(u_Time, TAU) + BIAS)));
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outColor = vec4(sampledColor.rgb * noiseColor, sampledColor.a);
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}
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