WIP3: problems with texture coordinates, needs fix.

shaders/star_ge.glsl

@@ -0,0 +1,28 @@
+#version 440
+
+const vec2 corners[4] = { 
+    vec2(0.0, 1.0), 
+	vec2(0.0, 0.0), 
+	vec2(1.0, 1.0), 
+	vec2(1.0, 0.0) 
+};
+
+layout(points) in;
+layout(triangle_strip, max_vertices = 4) out;
+
+uniform mat4 projection;
+float spriteSize = 1.0; // set here for now.
+out vec2 texCoord;
+
+void main()
+{
+	// make quad + corresp. UV coordinates.
+    for(int i=0; i<4; ++i){
+        vec4 pos    = gl_in[0].gl_Position;                  //start with point position
+        pos.xy     += spriteSize * (corners[i] - vec2(0.5)); //add corner position
+        gl_Position = projection * pos;                      //complete transformation
+        texCoord    = corners[i];                            //use corner as texCoord
+        EmitVertex();
+    }
+	EndPrimitive();
+}