diff options
Diffstat (limited to 'testing/web-platform/tests/webgl/conformance-1.0.3/conformance/ogles/GL/log2/log2_vec2_frag_xvary_ref.frag')
-rw-r--r-- | testing/web-platform/tests/webgl/conformance-1.0.3/conformance/ogles/GL/log2/log2_vec2_frag_xvary_ref.frag | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webgl/conformance-1.0.3/conformance/ogles/GL/log2/log2_vec2_frag_xvary_ref.frag b/testing/web-platform/tests/webgl/conformance-1.0.3/conformance/ogles/GL/log2/log2_vec2_frag_xvary_ref.frag new file mode 100644 index 000000000..ba37c09cc --- /dev/null +++ b/testing/web-platform/tests/webgl/conformance-1.0.3/conformance/ogles/GL/log2/log2_vec2_frag_xvary_ref.frag @@ -0,0 +1,53 @@ + +/* +** 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; +const float ln2 = 0.69314718055994530941723212145818; + + + +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 / ln2; + + gl_FragColor = vec4(y / 5.0, 0.0, 1.0); +} |