#extension GL_ARB_gpu_shader5 support the implicit conversion ,

So the best function matching algorithm should be actived.


Signed-off-by: ZhiqianXia <xzq0528@outlook.com>

Test/BestMatchFunction.vert

@@ -0,0 +1,20 @@
+#version 150
+#extension GL_ARB_gpu_shader5 : require
+
+uniform ivec4 u1;
+uniform uvec4 u2;
+out     vec4  result;
+vec4 f(in vec4 a, in vec4 b){ return a * b;}           // choice 1
+vec4 f(in uvec4 a, in uvec4 b){ return vec4(a - b);}   // choice 2
+
+void main()
+{
+    result = f(u1, u2); // should match choice 2. which have less implicit conversion. 
+    switch (gl_VertexID)
+    {
+      case 0: gl_Position = vec4(-1.0, 1.0, 0.0, 1.0); break;
+      case 1: gl_Position = vec4( 1.0, 1.0, 0.0, 1.0); break;
+      case 2: gl_Position = vec4(-1.0,-1.0, 0.0, 1.0); break;
+      case 3: gl_Position = vec4( 1.0,-1.0, 0.0, 1.0); break;
+    }
+}