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Diffstat (limited to '')
| -rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_float_vert_xvary01_ref.vert | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_float_vert_xvary01_ref.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_float_vert_xvary01_ref.vert new file mode 100644 index 0000000000..059566e7ee --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/log/log_float_vert_xvary01_ref.vert @@ -0,0 +1,37 @@ + +/* +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; + +void main (void) +{ + float x = (gtf_Color.r + 0.01) / 1.01; + 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) ] + // 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)); + float p = z; + for(int i = 1; i <= 101; i += 2) + { + y += p / float(i); + p *= z * z; + } + y *= -2.0; + + color = vec4(y / -4.61, 0.0, 0.0, 1.0); + gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; +} |