Stabilized noise shader to the fragment coordinate

space-crush/resources/shader/noise.frag

@@ -2,18 +2,25 @@
 
 in vec4 gl_FragCoord;
 
-out vec4 Color;
+layout (std140, binding = 0) uniform Camera {
+    mat4 projection;
+    mat4 view;
+} camera;
+
+out vec4 color;
 
 const float NOISE_RANGE = 0.05;
 const float NOISE_BASE  = 0.05;
 
-float random(vec4 seed) {
-    return fract(sin(dot(seed, vec4(12.9898, 78.233, 45.164, 53.1324))) * 43758.5453);
+float random (vec2 st) {
+    return fract(sin(dot(st.xy, vec2(12.9898,78.233))) * 43758.5453123);
 }
 
 void main() {
-    float rnd = random(gl_FragCoord);
-    vec3 rbg = vec3(NOISE_BASE + NOISE_RANGE * rnd);
+    vec4 pos = inverse(camera.view) * gl_FragCoord;
+
+    vec2 ipos = floor(pos.xy);
+    vec3 rbg = vec3(NOISE_BASE + NOISE_RANGE * random(ipos));
 
-    Color = vec4(rbg, 1.0);
+    color = vec4(rbg, 1.0);
 }

space-crush/resources/shader/noise.vert

@@ -1,7 +1,7 @@
 #version 450 core
 
-layout (location = 0) in vec3 Position;
+layout (location = 0) in vec3 position;
 
 void main() {
-    gl_Position = vec4(Position, 1.0);
+    gl_Position = vec4(2.0 * position, 1.0);
 }

space-crush/resources/shader/quad.vert

@@ -14,6 +14,6 @@ out FragmentData {
 } data;
 
 void main() {
-    data.color = vec3((position.xy + vec2(1.0)) / 2.0, 0.0);
+    data.color = vec3((position.xy + vec2(0.5)), 0.0);
     gl_Position = camera.projection * camera.view * model * vec4(position, 1.0);
 }

space-crush/src/app/misc/geometry.rs

@@ -37,10 +37,10 @@ struct Vertex {
 
 fn create_quad_array() -> Result<VertexArray, Error> {
     let vertices = &[
-        Vertex { x: -1.0, y: -1.0 },
-        Vertex { x: 1.0, y: -1.0 },
-        Vertex { x: 1.0, y: 1.0 },
-        Vertex { x: -1.0, y: 1.0 },
+        Vertex { x: -0.5, y: -0.5 },
+        Vertex { x: 0.5, y: -0.5 },
+        Vertex { x: 0.5, y: 0.5 },
+        Vertex { x: -0.5, y: 0.5 },
     ];
 
     const STRIDE_POS: gl::GLsizei = size_of::<Vertex>() as gl::GLsizei;