1 files changed, 40 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_vec3_vert_xvary01_ref.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_vec3_vert_xvary01_ref.vert
new file mode 100644
index 0000000000..97bfe7775d
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_vec3_vert_xvary01_ref.vert
@@ -0,0 +1,40 @@
+
+/*
+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.
+*/
+
+
+attribute vec4 gtf_Color;
+attribute vec4 gtf_Vertex;
+uniform mat4 gtf_ModelViewProjectionMatrix;
+varying vec4 color;
+const float ln2 = 0.69314718055994530941723212145818;
+
+
+
+void main (void)
+{
+	vec3 x = (gtf_Color.rgb + 0.01) / 1.01;
+	vec3 y = vec3(0.0);
+	vec3 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));
+	vec3 p = z;
+	for(int i = 1; i <= 101; i += 2)
+	{
+		y += p / float(i);
+		p *= z * z;
+	}
+	y *= -2.0 / ln2;
+
+	color = vec4(y / -8.0, 1.0);
+	gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
+}