glslang SPV tests: Add a set of SPV tests.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31212 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/spv.always-discard.frag

@@ -0,0 +1,36 @@
+#version 110
+varying vec2 tex_coord;
+
+void main (void)
+{
+    vec4 white = vec4(1.0);
+    vec4 black = vec4(0.2);
+    vec4 color = white;
+
+    // First, cut out our circle
+    float x = tex_coord.x*2.0 - 1.0;
+    float y = tex_coord.y*2.0 - 1.0;
+
+    float radius = sqrt(x*x + y*y);
+    if (radius > 1.0) {
+        if (radius > 1.1) {
+            ++color;
+        }
+
+        gl_FragColor = color;
+
+        if (radius > 1.2) {
+            ++color;
+        }
+
+    }
+
+    discard;
+
+    // If we're near an edge, darken us a tiny bit
+    if (radius >= 0.75)
+        color -= abs(pow(radius, 16.0)/2.0);
+
+    gl_FragColor = color;
+
+}