diff options
Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag')
| -rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag new file mode 100644 index 0000000000..9358f869ef --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_vec2_frag_xvary_ref.frag @@ -0,0 +1,115 @@ + +/* +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 = 4.0 * 2.0 * (color.rg - 0.5); + vec2 atan_c = vec2(0.0); + vec2 scale = vec2(1.0); + vec2 sign = vec2(1.0); + vec4 result = vec4(0.0, 0.0, 0.0, 1.0); + + if(c[0] < 0.0) + { + sign[0] = -1.0; + c[0] *= -1.0; + } + + if(c[0] <= 1.0) + { + // Taylors series expansion for atan + atan_c[0] += scale[0] * pow(c[0], float(1)) / float(1); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(3)) / float(3); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(5)) / float(5); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(7)) / float(7); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(9)) / float(9); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(11)) / float(11); + scale[0] *= -1.0; + + result[0] = sign[0] * atan_c[0] / M_PI + 0.5; + } + else + { + c[0] = 1.0 / c[0]; + + // Taylors series expansion for atan + atan_c[0] += scale[0] * pow(c[0], float(1)) / float(1); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(3)) / float(3); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(5)) / float(5); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(7)) / float(7); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(9)) / float(9); + scale[0] *= -1.0; + atan_c[0] += scale[0] * pow(c[0], float(11)) / float(11); + scale[0] *= -1.0; + + result[0] = sign[0] * (M_PI / 2.0 - atan_c[0]) / M_PI + 0.5; + } + + + if(c[1] < 0.0) + { + sign[1] = -1.0; + c[1] *= -1.0; + } + + if(c[1] <= 1.0) + { + // Taylors series expansion for atan + atan_c[1] += scale[1] * pow(c[1], float(1)) / float(1); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(3)) / float(3); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(5)) / float(5); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(7)) / float(7); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(9)) / float(9); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(11)) / float(11); + scale[1] *= -1.0; + + result[1] = sign[1] * atan_c[1] / M_PI + 0.5; + } + else + { + c[1] = 1.0 / c[1]; + + // Taylors series expansion for atan + atan_c[1] += scale[1] * pow(c[1], float(1)) / float(1); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(3)) / float(3); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(5)) / float(5); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(7)) / float(7); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(9)) / float(9); + scale[1] *= -1.0; + atan_c[1] += scale[1] * pow(c[1], float(11)) / float(11); + scale[1] *= -1.0; + + result[1] = sign[1] * (M_PI / 2.0 - atan_c[1]) / M_PI + 0.5; + } + + gl_FragColor = result; +} |