diff options
Diffstat (limited to '')
| -rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_float_frag_xvary_ref.frag | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_float_frag_xvary_ref.frag b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_float_frag_xvary_ref.frag new file mode 100644 index 0000000000..778cdcd14a --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log2/log2_float_frag_xvary_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; +const float ln2 = 0.69314718055994530941723212145818; + + + +void main (void) +{ + float x = 31.0 * color.r + 1.0; + float y = 0.0; + float 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); + float 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, 0.0, 1.0); +} |