path: root/src/shader.frag

#version 450

layout(location = 0) in vec3 fragColor;
layout(location = 1) in vec2 fragTexCoord;

layout(location = 0) out vec4 outColor;

layout(binding = 1) uniform sampler2D texSampler;

layout(binding = 0) uniform UniformBufferObject {
  mat4 model;
  mat4 view;
  mat4 proj;
  vec2 resolution;
  float time;
  float dt;
} ubo;

// void main() {
//   // float pulse = sin(ubo.time * .2) * .5 + .5;
//   // outColor = vec4(fragColor * texture(texSampler, fragTexCoord).rgb * pulse, 1.0);
//   //outColor = texture(texSampler, fragTexCoord);
//   outColor = vec4(fragColor, 1);
// //   float repeat = 10;
// //   float f = mod(ubo.time, repeat);
// //   if (f < repeat / 2) {
// //     outColor = vec4(fragColor * radians(f) ,1);
// //   } else {
// //     outColor = vec4(fragColor * radians(1 - f) ,1);
// //   }
// //   //outColor = (vec4(1) * ubo.model + vec4(1)) * vec4(texture(texSampler, fragTexCoord).rgb * fragColor, 1.0);
// }

float noise(vec2 p) {
    return fract(sin(dot(p, vec2(12.9898, 78.233))) * 43758.5453);
}

float smoothNoise(vec2 p) {
    vec2 i = floor(p);
    vec2 f = fract(p);
    vec2 u = f * f * (3.0 - 2.0 * f);
    return mix(mix(noise(i + vec2(0.0, 0.0)), noise(i + vec2(1.0, 0.0)), u.x),
               mix(noise(i + vec2(0.0, 1.0)), noise(i + vec2(1.0, 1.0)), u.x), u.y);
}

float fbm(vec2 p) {
    float value = 0.0;
    float amplitude = 0.5;
    for (int i = 0; i < 6; i++) {
        value += amplitude * smoothNoise(p);
        p *= 2.0;
        amplitude *= 0.5;
    }
    return value;
}

void main() {
    vec2 uv = gl_FragCoord.xy / ubo.resolution.xy;
    vec2 p = uv * 2.0 - vec2(1.0);
    float n = fbm(p * 5.0 - vec2(0.0, ubo.time * 2.0));
    outColor = vec4(n, n * 0.5, 0.0, 1.0) * vec4(texture(texSampler, fragTexCoord).rgb, 1.0);
}

// void main() {

//     // Calculate a pulsating factor based on sine wave
//     float pulse = sin(ubo.time * 2.0) * 0.5 + 0.5;
    
//     // Set the color using the pulse factor
//     outColor = vec4(pulse, 0.0, 1.0 - pulse, .5);
// }

// void main() {
//     vec2 uv = gl_FragCoord.xy / ubo.resolution;
//     vec2 center = uv - 0.5;
    
//     float angle = ubo.time;
//     float cosA = cos(angle);
//     float sinA = sin(angle);
    
//     vec2 rotated = vec2(
//         center.x * cosA - center.y * sinA,
//         center.x * sinA + center.y * cosA
//     );
    
//     float pattern = step(0.5, mod(rotated.x * 10.0, 1.0)) * step(0.5, mod(rotated.y * 10.0, 1.0));
    
//     outColor = vec4(vec3(pattern), 1.0);
// }