Update background shader

openVulkanoCpp/Shader/background.vert

@@ -3,39 +3,45 @@
 
 layout(set = 1, binding = 0) uniform CameraData
 {
-    mat4 viewProjection;
-    mat4 view;
-    mat4 projection;
-    vec4 camPos;
-    float nearPlane;
-    float farPlane;
-    float width;
-    float height;
-    float fov;
-    float aspect;
-    float scaleFactor;
-    float pixelScaleFactor;
+	mat4 viewProjection;
+	mat4 view;
+	mat4 projection;
+	vec4 camPos;
+	float nearPlane;
+	float farPlane;
+	float width;
+	float height;
+	float fov;
+	float aspect;
+	float scaleFactor;
+	float pixelScaleFactor;
 } cam;
 
-// Grid position are in clipped space
-vec4 gridPlane[4] = vec4[] (
-    vec4(1, 1, 0, 1), vec4(-1, 1, 0, 1), vec4(1, -1, 0, 1), vec4(-1, -1, 0, 1)
+layout(location = 0) out vec2 textureCoordinates;
+
+const float FLOAT_MAX_LESS_THAN_1 = 0.999999940395355224609;
+// Background plane positions are in clipped space
+const vec4 PLANE[4] = vec4[] (
+	vec4(1, -1, FLOAT_MAX_LESS_THAN_1, 1), vec4(-1, -1, FLOAT_MAX_LESS_THAN_1, 1), vec4(1, 1, FLOAT_MAX_LESS_THAN_1, 1), vec4(-1, 1, FLOAT_MAX_LESS_THAN_1, 1)
+);
+const vec2 TEX_COORDS[4] = vec2[] (
+	vec2(1, 0), vec2(0, 0), vec2(1, 1), vec2(0, 1)
 );
 
-float realFov = 53;
+float realFov = 53; //TODO
+float realScale = tan(radians(realFov * 0.5)) * 2;
 float realAspect = 1.33333333;
 
 void main() {
-    float virtualAspect = cam.width / cam.height;
-    vec4 position = gridPlane[gl_VertexIndex];
+	vec4 position = PLANE[gl_VertexIndex];
 
-    // Calculate the scaling factors for width and height
-    float scaleX = tan(radians(cam.fov * 0.5)) / tan(radians(realFov * 0.5));
-    float scaleY = virtualAspect / realAspect * scaleX;
+	// Calculate the scaling factors for width and height
+	float scaleX = realScale / cam.scaleFactor;
+	float scaleY = cam.aspect / realAspect * scaleX;
 
-    // Scale the quad's position
-    position.xy *= vec2(scaleX, scaleY);
+	// Scale the quad's position
+	position.xy *= vec2(scaleX, scaleY);
 
-    // Pass the transformed position to the fragment shader
-    gl_Position = position;
+	gl_Position = position;
+	textureCoordinates = TEX_COORDS[gl_VertexIndex];
 }