diff options
Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvaryyvary.frag')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvaryyvary.frag | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvaryyvary.frag b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvaryyvary.frag new file mode 100644 index 0000000000..8bffcb3dad --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvaryyvary.frag @@ -0,0 +1,32 @@ + +/* +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; + +void main (void) +{ + const float M_PI = 3.14159265358979323846; + vec2 x = 2.0 * (color.gg - 0.5); + vec2 y = 2.0 * (color.bb - 0.5); + const float epsilon = 1.0e-4; + gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0); + + // Avoid evaluating atan(0, x) for x < epsilon because it's implementation-dependent + if(x[0] > epsilon || abs(y[0]) > epsilon) + { + gl_FragColor[0] = atan(y[0], x[0]) / (2.0 * M_PI) + 0.5; + } + + if(x[1] > epsilon || abs(y[1]) > epsilon) + { + gl_FragColor[1] = atan(y[1], x[1]) / (2.0 * M_PI) + 0.5; + } +} |