Add ToT WebGL conformance tests : part 9

conformance/ogles/GL/mat/const_mat2_frag.frag

+
+/*
+** Copyright (c) 2012 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+/* This epsilon will work as long as the magnitude of the float is < 128.
+ * This can be seen by taking the spec relative mediump precision of 2^-10:
+ * 0.125 / 2^-10 = 128
+ */
+#define ERROR_EPSILON (0.125)
+
+void main (void)
+{
+        float x;
+        // Declare a constant 2 by 2 matrix with unique elements.
+        const mat2 a = mat2(1.0, 2.0,   // 1.0 4.0
+                            4.0, 8.0);  // 2.0 8.0
+
+        // Check each element.
+        bool elms = true;
+        if(a[0][0] != 1.0) elms = false;
+        if(a[0][1] != 2.0) elms = false;
+        if(a[1][0] != 4.0) elms = false;
+        if(a[1][1] != 8.0) elms = false;
+
+        // Add up each row.
+        bool rows = true;
+        x = a[0][0] + a[1][0];
+        if(x < 5.0-ERROR_EPSILON || x > 5.0+ERROR_EPSILON) rows = false;
+        x = a[0][1] + a[1][1];
+        if(x < 10.0-ERROR_EPSILON || x > 10.0+ERROR_EPSILON) rows = false;
+
+        // Add up each column.
+        bool cols = true;
+        x = a[0][0] + a[0][1];
+        if(x < 3.0-ERROR_EPSILON || x > 3.0+ERROR_EPSILON) cols = false;
+        x = a[1][0] + a[1][1];
+        if(x < 12.0-ERROR_EPSILON || x > 12.0+ERROR_EPSILON) cols = false;
+
+        // Check if all of the operations were successful.
+        float gray = elms && rows && cols ? 1.0 : 0.0;
+
+        // Assign the fragment color.
+        gl_FragColor = vec4(gray, gray, gray, 1.0);
+}
+