Add ToT WebGL conformance tests : part 9

conformance/ogles/GL/mat/mat4_16float_frag.frag

Index: conformance/ogles/GL/mat/mat4_16float_frag.frag
===================================================================
--- conformance/ogles/GL/mat/mat4_16float_frag.frag	(revision 0)
+++ conformance/ogles/GL/mat/mat4_16float_frag.frag	(working copy)
@@ -0,0 +1,74 @@
+
+/*
+** 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
+varying vec4 color;
+
+/* 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)
+{
+	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);
+	float gray,sum1=0.0,sum2=0.0,sum3=0.0,sum4=0.0;
+	int i;
+
+
+	sum1 += a[0][0];
+	sum2 += a[1][0];
+	sum3 += a[2][0];
+	sum4 += a[3][0];
+	
+	sum1 += a[0][1];
+	sum2 += a[1][1];
+	sum3 += a[2][1];
+	sum4 += a[3][1];
+	
+	sum1 += a[0][2];
+	sum2 += a[1][2];
+	sum3 += a[2][2];
+	sum4 += a[3][2];
+	
+	sum1 += a[0][3];
+	sum2 += a[1][3];
+	sum3 += a[2][3];
+	sum4 += a[3][3];
+
+	if( ( sum1 > 10.0-ERROR_EPSILON && sum1 < 10.0+ERROR_EPSILON  ) && 
+		( sum2 > 26.0-ERROR_EPSILON && sum2 < 26.0+ERROR_EPSILON) && 
+		( sum3 > 42.0-ERROR_EPSILON && sum3 < 42.0+ERROR_EPSILON) && 
+		( sum4 > 58.0-ERROR_EPSILON && sum4 < 58.0+ERROR_EPSILON) )
+	gray=1.0;
+	else gray=0.0;
+	gl_FragColor = vec4(gray, gray, gray, 1.0);
+}