Index: conformance/ogles/GL/log/log_vec2_frag_xvary_ref.frag |
=================================================================== |
--- conformance/ogles/GL/log/log_vec2_frag_xvary_ref.frag (revision 0) |
+++ conformance/ogles/GL/log/log_vec2_frag_xvary_ref.frag (working copy) |
@@ -0,0 +1,50 @@ |
+ |
+/* |
+** 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) |
+{ |
+ vec2 x = 31.0 * color.rg + 1.0; |
+ 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) ] |
+ z = (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 / 3.466, 0.0, 1.0); |
+} |