1 files changed, 36 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_vec2_frag_xvary01_ref.frag b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_vec2_frag_xvary01_ref.frag
new file mode 100644
index 0000000000..4f3cc1c805
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_vec2_frag_xvary01_ref.frag
@@ -0,0 +1,36 @@
+
+/*
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+*/
+
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+varying vec4 color;
+
+void main (void)
+{
+	vec2 x = (color.rg + 0.01) / 1.01;
+	vec2 y = vec2(0.0);
+	vec2 z;   // x-1 / x+1
+	int n = 50;
+
+	// ln(x) = 2[x-1 + 1 (x-1)^3 + 1 (x-1)^5 + ...] for x > 0
+	//          [x+1   3 (x+1)     5 (x+1)        ]
+	// Note: z will always be negative between 0.01 and 1.0 and
+	// so will y since it is raised to an odd power, and the shader spec
+	// does not support pow(-x, y) where y is not a compile time constant
+	z = abs((x - 1.0) / (x + 1.0));
+	vec2 p = z;
+	for(int i = 1; i <= 101; i += 2)
+	{
+		y += p / float(i);
+		p *= z * z;
+	}
+	y *= -2.0;
+
+	gl_FragColor = vec4(y / -4.61, 0.0, 1.0);
+}