Add ToT WebGL conformance tests : part 9

conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag

Index: conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag
===================================================================
--- conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag	(revision 0)
+++ conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag	(working copy)
@@ -0,0 +1,132 @@
+
+/*
+** 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;
+
+void main (void)
+{
+	const float M_PI = 3.14159265358979323846;
+	vec2 c = 4.0 * 2.0 * (color.rg - 0.5);
+	vec2 atan_c = vec2(0.0);
+	vec2 scale = vec2(1.0);
+	vec2 sign = vec2(1.0);
+	vec4 result = vec4(0.0, 0.0, 0.0, 1.0);
+	
+	if(c[0] < 0.0)
+	{
+		sign[0] = -1.0;
+		c[0] *= -1.0;
+	}
+
+	if(c[0] <= 1.0)
+	{
+		// Taylors series expansion for atan
+		atan_c[0] += scale[0] * pow(c[0], float(1)) / float(1);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(3)) / float(3);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(5)) / float(5);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(7)) / float(7);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(9)) / float(9);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(11)) / float(11);
+		scale[0] *= -1.0;
+
+		result[0] = sign[0] * atan_c[0] / M_PI + 0.5;
+	}
+	else
+	{
+		c[0] = 1.0 / c[0];
+
+		// Taylors series expansion for atan
+		atan_c[0] += scale[0] * pow(c[0], float(1)) / float(1);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(3)) / float(3);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(5)) / float(5);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(7)) / float(7);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(9)) / float(9);
+		scale[0] *= -1.0;
+		atan_c[0] += scale[0] * pow(c[0], float(11)) / float(11);
+		scale[0] *= -1.0;
+
+		result[0] = sign[0] * (M_PI / 2.0 - atan_c[0]) / M_PI + 0.5;
+	}
+	
+	
+	if(c[1] < 0.0)
+	{
+		sign[1] = -1.0;
+		c[1] *= -1.0;
+	}
+
+	if(c[1] <= 1.0)
+	{
+		// Taylors series expansion for atan
+		atan_c[1] += scale[1] * pow(c[1], float(1)) / float(1);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(3)) / float(3);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(5)) / float(5);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(7)) / float(7);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(9)) / float(9);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(11)) / float(11);
+		scale[1] *= -1.0;
+
+		result[1] = sign[1] * atan_c[1] / M_PI + 0.5;
+	}
+	else
+	{
+		c[1] = 1.0 / c[1];
+
+		// Taylors series expansion for atan
+		atan_c[1] += scale[1] * pow(c[1], float(1)) / float(1);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(3)) / float(3);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(5)) / float(5);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(7)) / float(7);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(9)) / float(9);
+		scale[1] *= -1.0;
+		atan_c[1] += scale[1] * pow(c[1], float(11)) / float(11);
+		scale[1] *= -1.0;
+
+		result[1] = sign[1] * (M_PI / 2.0 - atan_c[1]) / M_PI + 0.5;
+	}
+
+	gl_FragColor = result;
+}