add tonemapping shaders

shader/full_screen_rectangle.vert.glsl

@@ -0,0 +1,12 @@
+#version 450 core
+
+layout(location = 0) in vec2 Vertex;
+
+layout(location = 0) out vec2 FragmentPosition;
+
+void main()
+{
+    gl_Position=vec4(Vertex,0.0,1.0);
+
+    FragmentPosition=(Vertex+1.0)/2.0;
+}