diff options
Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/tan/tan_vec2_frag_xvary.frag')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/tan/tan_vec2_frag_xvary.frag | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/tan/tan_vec2_frag_xvary.frag b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/tan/tan_vec2_frag_xvary.frag new file mode 100644 index 0000000000..523a66208b --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/tan/tan_vec2_frag_xvary.frag @@ -0,0 +1,30 @@ + +/* +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 c = 0.5 * M_PI * 2.0 * (color.rg - 0.5); + vec2 o; + if(abs(c.r) < 0.5) // -45..45 + o.r = 0.5 * tan(c.r) + 0.5; + else // 45..90, -45..-90 + o.r = 0.5 / tan(c.r) + 0.5; + + if(abs(c.g) < 0.5) // -45..45 + o.g = 0.5 * tan(c.g) + 0.5; + else // 45..90, -45..-90 + o.g = 0.5 / tan(c.g) + 0.5; + + gl_FragColor = vec4(o, 0.0, 1.0); +} |