shader should be good

src/graphics.rs

@@ -16,18 +16,18 @@ pub struct Vertex {
     pub color: [f32; 4],
     pub tex_coords: [f32; 2],
     /// Each bit is used as a flag :
-    /// 0: Scaled and moved according to camera
-    /// 1: Grayscale
-    /// 2: Whiter
+    /// 1: Scaled and moved according to camera
+    /// 2: Grayscale
+    /// 4: Whiter
     /// 
-    /// For exemple 0b110 corresponds to Scaled and Grayscale
+    /// For exemple 0b011 corresponds to Scaled and Grayscale
     pub effect: u32,
 }
 impl Vertex {
     const DESC: VertexBufferLayout<'static> = VertexBufferLayout {
         array_stride: std::mem::size_of::<Vertex>() as wgpu::BufferAddress,
         step_mode: wgpu::VertexStepMode::Vertex,
-        attributes: &wgpu::vertex_attr_array![0 => Float32x2, 1 => Float32x4, 2 => Uint32],
+        attributes: &wgpu::vertex_attr_array![0 => Float32x2, 1 => Float32x4, 2 => Float32x2, 3 => Uint32],
     };
 }
 

src/shader.wgsl

@@ -7,16 +7,29 @@ struct Uniforms {
 struct VertexOutput {
     @location(0) tex_coords: vec2f,
     @location(1) color: vec4f,
+    @location(2) effect: u32,
     @builtin(position) pos: vec4f
 }
 
 @vertex
 fn vs_main(
     @location(0) pos: vec2f,
-    @location(1) tex_coords: vec2f,
-    @location(2) effect: u32
+    @location(1) color: vec4f,
+    @location(2) tex_coords: vec2f,
+    @location(3) effect: u32
 ) -> VertexOutput {
-    var out: VertexOutput;
+    var screen_pos: vec4f;
+    if (effect & 1) == 0 {
+        screen_pos = vec4f(pos, 0, 1);
+    } else {
+        screen_pos = vec4f((pos - uniforms.camera) * uniforms.zooms, 0, 1);
+    }
+    var out = VertexOutput(
+        tex_coords,
+        color,
+        effect,
+        screen_pos
+    );
     return out;
 }
 
@@ -29,27 +42,16 @@ var s_diffuse: sampler;
 fn fs_main(in: VertexOutput) -> @location(0) vec4f {
     var tex_col = textureSample(t_diffuse, s_diffuse, in.tex_coords);
     var color = vec4f((tex_col.rgb * tex_col.a) + (in.color.rgb * in.color.a), tex_col.a + in.color.a);
-    if effect & 0100u != 0u {
-      color = vec4f(1.0 - color.r, 1.0 - color.g, 1.0 - color.b, color.a);
+    // Grayscale
+    if (in.effect & 2) != 0 {
+        var v = (color.r*0.299) + (color.g*0.587) + (color.b*0.114);
+        color = vec4f(v, v, v, color.a);
     }
-    switch effect {
-        case 1u, 3u: {
-            var v = (color.r*0.299) + (color.g*0.587) + (color.b*0.114);
-            color = vec4f(v, v, v, color.a);
-        }
-        case 0u, 2u: {
-            color = color;
-        }
-        default: {}
-    }
-    switch effect {
-        case 0u, 1u: {
-            pos = vec4f(pos, 0, 1);
-        }
-        case 2u, 3u: {
-            pos = vec4f((pos - uniforms.camera) * uniforms.zooms, 0, 1);
-        }
-        default: {}
+    // Whiter
+    if (in.effect & 4) != 0 {
+        color.r += 0.4;
+        color.g += 0.4;
+        color.b += 0.4;
     }
     return color;
 }