Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

glsl/postprocess_textured.vert

@@ -0,0 +1,14 @@
+#version {VERSION}
+
+uniform vec2 Pos, Scroll;
+uniform vec2 p1, p2;
+
+in vec2 aVertexPosition;
+in vec2 aVertexTexCoord;
+out vec2 vTexCoord;
+
+void main()
+{
+	gl_Position = vec4((aVertexPosition + Pos - Scroll) * p1 + p2, 0, 1);
+	vTexCoord = aVertexTexCoord;
+}