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.precision.frag

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+#version 300 es
+precision mediump float;
+in lowp float lowfin;
+in mediump float mediumfin;
+in highp vec4 highfin;
+
+uniform highp int uniform_high;
+uniform mediump int uniform_medium;
+uniform lowp int uniform_low;
+uniform bvec2 ub2;
+
+out mediump vec4 mediumfout;
+
+highp float global_highp;
+
+lowp vec2 foo(mediump vec3 mv3)
+{
+    return highfin.xy;
+}
+
+bool boolfun(bvec2 bv2)
+{
+    return bv2 == bvec2(false, true);
+}
+
+void main()
+{
+    lowp int sum = uniform_medium + uniform_high;
+
+    sum += uniform_high;
+    sum += uniform_low;
+    
+    // test maxing precisions of args to get precision of builtin
+    lowp float arg1 = 3.2;
+    mediump float arg2 = 1023908.2;
+    lowp float d = distance(lowfin, mediumfin);
+
+    global_highp = length(highfin);
+
+    highp vec4 local_highp = vec4(global_highp);
+
+    mediumfout = vec4(sin(d)) + arg2 + local_highp;
+
+    sum += 4 + ((ivec2(uniform_low) * ivec2(uniform_high) + ivec2((/* comma operator */uniform_low, uniform_high)))).x;
+
+    mediumfout += vec4(sum);
+
+    if (boolfun(ub2))
+        ++mediumfout;
+}