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Diffstat (limited to '')
| -rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary.vert | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary.vert new file mode 100644 index 0000000000..6da6ba13b6 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary.vert @@ -0,0 +1,29 @@ + +/* +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_Vertex; +attribute vec4 gtf_Color; +uniform mat4 gtf_ModelViewProjectionMatrix; +varying vec4 color; + +void main (void) +{ + const float M_PI = 3.14159265358979323846; + float x = 2.0 * (gtf_Color.g - 0.5); + float y = 2.0 * (gtf_Color.b - 0.5); + const float epsilon = 1.0e-4; + color = vec4(0.0, 0.0, 0.0, 1.0); + + // Avoid evaluating atan(0, x) for x < epsilon because it's implementation-dependent + if(x > epsilon || abs(y) > epsilon) + { + color = vec4(atan(y, x) / (2.0 * M_PI) + 0.5, 0.0, 0.0, 1.0); + } + + gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; +} |