removed vertex and index buffers, we are only rendering fullscreen

src/shaders/shader.vert

@@ -1,11 +1,19 @@
 #version 450
 
-layout(location=0) in vec3 in_position;
-layout(location=1) in vec2 in_uv;
 layout(location=0) out vec2 vert_uv;
 
+const vec2 positions[6] = vec2[6](
+    vec2(-1.0, 1.0),
+    vec2( 1.0, 1.0),
+    vec2( 1.0,-1.0),
+
+    vec2(-1.0, 1.0),
+    vec2( 1.0,-1.0),
+    vec2(-1.0,-1.0)
+);
+
 void main() 
 {
-    vert_uv = in_uv;
-    gl_Position = vec4(in_position, 1.0);
+    vert_uv = positions[gl_VertexIndex];
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
 }