Add gl_PointCoord.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20510 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/pointCoord.frag

@@ -0,0 +1,15 @@
+precision mediump float;
+
+uniform sampler2D sampler;
+
+void main()
+{
+    vec4 color;
+
+    if (length(gl_PointCoord) < 0.3)
+        color = texture2D(sampler, gl_PointCoord);
+    else
+        color = vec4(0.0);
+
+    gl_FragColor = color;
+}