feat: Added shader loading and swapping as well as beginnings of out of the box noise generation and support for multiple render passes

resources/shaders/crt.wgsl

@@ -0,0 +1,68 @@
+// Vertex shader
+struct CameraUniform {
+    view_proj: mat4x4<f32>,
+};
+@group(1) @binding(0) // 1.
+var<uniform> camera: CameraUniform;
+
+struct VertexInput {
+    @location(0) position: vec3<f32>,
+    @location(1) tex_coords: vec2<f32>,
+    @location(2) color: vec4<f32>,
+}
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) tex_coords: vec2<f32>,
+    @location(1) color: vec4<f32>,
+}
+
+@vertex
+fn vs_main(
+    model: VertexInput,
+) -> VertexOutput {
+    var out: VertexOutput;
+    out.tex_coords = model.tex_coords;
+    out.color = model.color;
+    out.clip_position = camera.view_proj * vec4<f32>(model.position, 1.0);
+    return out;
+}
+
+@group(0) @binding(0)
+var t_diffuse: texture_2d<f32>;  // Diffuse texture
+@group(0) @binding(1)
+var s_diffuse: sampler;  // Sampler for the texture
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    // Sample the texture using the input texture coordinates
+    var texColor: vec4<f32> = textureSample(t_diffuse, s_diffuse, in.tex_coords);
+
+    // Apply CRT curvature effect (distortion)
+    let center = vec2<f32>(0.5, 0.5);  // center of the screen
+    let dist = distance(in.tex_coords, center);  // Distance from the center
+    let curvature = 0.1;  // Adjust for more or less curvature
+    var distorted_uv = in.tex_coords + (in.tex_coords - center) * curvature * dist;
+
+    // Apply chromatic aberration by slightly offsetting the UV coordinates
+    let redOffset = 0.005;
+    let greenOffset = 0.0;
+    let blueOffset = -0.005;
+
+    let redColor = textureSample(t_diffuse, s_diffuse, distorted_uv + vec2<f32>(redOffset, 0.0));
+    let greenColor = textureSample(t_diffuse, s_diffuse, distorted_uv + vec2<f32>(greenOffset, 0.0));
+    let blueColor = textureSample(t_diffuse, s_diffuse, distorted_uv + vec2<f32>(blueOffset, 0.0));
+
+    // Combine chromatic aberration with the original color
+    texColor.r = redColor.r;
+    texColor.g = greenColor.g;
+    texColor.b = blueColor.b;
+
+    // Apply scanline effect (darken even rows for scanlines)
+    let scanlineEffect = 0.1 * (sin(in.clip_position.y * 0.3) + 1.0);  // Horizontal scanlines
+    texColor.r *= scanlineEffect;  // Apply scanline effect to red channel
+    texColor.g *= scanlineEffect;  // Apply scanline effect to green channel
+    texColor.b *= scanlineEffect;  // Apply scanline effect to blue channel
+
+    return texColor;
+}