Extended test to include a test for GL uniform array of size 1

ie.
uniform float2_struct M[1];

util/test/demos/gl/gl_cbuffer_zoo.cpp

@@ -342,6 +342,7 @@ uniform uvec2 I;
 uniform uvec3 J;
 uniform uvec4 K;
 uniform ivec4 L;
+uniform float2_struct M[1];
 
 void main()
 {
@@ -355,6 +356,7 @@ void main()
   blah *= vertIn.uv.z;
   if(H < 1 || I.x < 1 || J.x < 1 || K.x < 1) blah *= 0.1f;
   if(L.x > 1) blah *= 0.1f;
+  blah += M[0].x + M[0].y;
   Color = blah + test + vec4(0.1f, 0.0f, 0.0f, 0.0f);
 }
 
@@ -622,6 +624,13 @@ void main()
       if(location != -1)
         glUniform4i(location, -24000, -25000, -26000, -27000);
 
+      location = glGetUniformLocation(program, "M[0].x");
+      if(location != -1)
+        glUniform1f(location, 28001.0);
+      location = glGetUniformLocation(program, "M[0].y");
+      if(location != -1)
+        glUniform1f(location, -28000.0);
+
       glViewport(0, 0, GLsizei(screenWidth), GLsizei(screenHeight));
 
       glDrawArrays(GL_TRIANGLES, 0, 3);

util/test/tests/GL/GL_CBuffer_Zoo.py

@@ -428,7 +428,7 @@ class GL_CBuffer_Zoo(rdtest.TestCase):
 
         rdtest.log.success("CBuffer variables are as expected")
 
-        self.check_pixel_value(pipe.GetOutputTargets()[0].resourceId, 0.5, 0.5, [536.1, 537.0, 538.0, 539.0])
+        self.check_pixel_value(pipe.GetOutputTargets()[0].resourceId, 0.5, 0.5, [537.1, 538.0, 539.0, 540.0])
 
         rdtest.log.success("Picked value is as expected")
 
@@ -577,6 +577,11 @@ class GL_CBuffer_Zoo(rdtest.TestCase):
         var_check.check('J').cols(3).rows(1).value([17000, 18000, 19000])
         var_check.check('K').cols(4).rows(1).value([20000, 21000, 22000, 23000])
         var_check.check('L').cols(4).rows(1).value([-24000, -25000, -26000, -27000])
+        # float2_struct M[1];
+        var_check.check('M').cols(0).rows(0).arraySize(2).members({
+            0: lambda x: x.cols(1).rows(1).value([28001.0]),
+            1: lambda x: x.cols(1).rows(1).value([-28000.0]),
+        })
 
         var_check.done()