Add some shaders

openVulkanoCpp/Shader/background.vert

@@ -0,0 +1,39 @@
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(std140, push_constant) uniform CameraData
+{
+    mat4 viewProjection;
+    mat4 view;
+    mat4 projection;
+    vec4 camPos;
+    float nearPlane;
+    float farPlane;
+    float width;
+    float height;
+    float fov;
+    float aspect;
+} 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)
+);
+
+float realFov = 53;
+float realAspect = 1.33333333;
+
+void main() {
+    float virtualAspect = cam.width / cam.height;
+    vec4 position = gridPlane[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;
+
+    // Scale the quad's position
+    position.xy *= vec2(scaleX, scaleY);
+
+    // Pass the transformed position to the fragment shader
+    gl_Position = position;
+}