add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/OpenGLWindow/Shaders/pointSpritePS.glsl

@@ -0,0 +1,37 @@
+
+#version 330
+precision highp float;
+
+in Fragment
+{
+     vec4 color;
+} fragment;
+
+
+in vec3 ambient;
+
+out vec4 color;
+
+void main_textured(void)
+{
+    color =  fragment.color;//texture2D(Diffuse,vert.texcoord);//fragment.color;
+}
+
+void main(void)
+{
+	vec3 N;
+	N.xy = gl_PointCoord.st*vec2(2.0, -2.0) + vec2(-1.0, 1.0);
+    float mag = dot(N.xy, N.xy);
+    if (mag > 1.0) discard; 
+    vec4 texel = fragment.color;//vec4(1,0,0,1);//fragment.color*texture(Diffuse,vert.texcoord);//fragment.color;
+	vec3 ct;
+	float at,af;
+	af = 1.0;
+		
+	ct = texel.rgb;
+	at = texel.a;
+		
+ vec3 lightDir= vec3(1,0,0);
+	float diffuse = max(0.0, dot(lightDir, N));
+	color  = vec4(ct * diffuse, at * af);	
+}