Add ToT WebGL conformance tests : part 9

conformance/ogles/GL/mat/mat4_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 4 by 4 matrix with unique elements.
+        mat4 a = mat4( 1.0,  2.0,  3.0,  4.0,   
+                       5.0,  6.0,  7.0,  8.0,   
+                       9.0, 10.0, 11.0, 12.0,   
+                      13.0, 14.0, 15.0, 16.0);  
+
+        // Check each element.
+        bool elms = true;
+        if(a[0][0] !=  1.0) elms = false;
+        if(a[0][1] !=  2.0) elms = false;
+        if(a[0][2] !=  3.0) elms = false;
+        if(a[0][3] !=  4.0) elms = false;
+        if(a[1][0] !=  5.0) elms = false;
+        if(a[1][1] !=  6.0) elms = false;
+        if(a[1][2] !=  7.0) elms = false;
+        if(a[1][3] !=  8.0) elms = false;
+        if(a[2][0] !=  9.0) elms = false;
+        if(a[2][1] != 10.0) elms = false;
+        if(a[2][2] != 11.0) elms = false;
+        if(a[2][3] != 12.0) elms = false;
+        if(a[3][0] != 13.0) elms = false;
+        if(a[3][1] != 14.0) elms = false;
+        if(a[3][2] != 15.0) elms = false;
+        if(a[3][3] != 16.0) elms = false;
+
+        // Add up each row.
+        bool rows = true;
+        x = a[0][0] + a[1][0] + a[2][0] + a[3][0];
+        if(x < 28.0-ERROR_EPSILON || x > 28.0+ERROR_EPSILON) rows = false;
+        x = a[0][1] + a[1][1] + a[2][1] + a[3][1];
+        if(x < 32.0-ERROR_EPSILON || x > 32.0+ERROR_EPSILON) rows = false;
+        x = a[0][2] + a[1][2] + a[2][2] + a[3][2];
+        if(x < 36.0-ERROR_EPSILON || x > 36.0+ERROR_EPSILON) rows = false;
+        x = a[0][3] + a[1][3] + a[2][3] + a[3][3];
+        if(x < 40.0-ERROR_EPSILON || x > 40.0+ERROR_EPSILON) rows = false;
+
+        // Add up each column of the copy.
+        bool cols = true;
+        x = a[0][0] + a[0][1] + a[0][2] + a[0][3];
+        if(x < 10.0-ERROR_EPSILON || x > 10.0+ERROR_EPSILON) cols = false;
+        x = a[1][0] + a[1][1] + a[1][2] + a[1][3];
+        if(x < 26.0-ERROR_EPSILON || x > 26.0+ERROR_EPSILON) cols = false;
+        x = a[2][0] + a[2][1] + a[2][2] + a[2][3];
+        if(x < 42.0-ERROR_EPSILON || x > 42.0+ERROR_EPSILON) cols = false;
+        x = a[3][0] + a[3][1] + a[3][2] + a[3][3];
+        if(x < 58.0-ERROR_EPSILON || x > 58.0+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);
+}
+