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Diffstat (limited to '')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/cos/cos_float_vert_xvary_ref.vert | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/cos/cos_float_vert_xvary_ref.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/cos/cos_float_vert_xvary_ref.vert new file mode 100644 index 0000000000..38b68b78ad --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/cos/cos_float_vert_xvary_ref.vert @@ -0,0 +1,33 @@ + +/* +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) +{ + const float M_PI = 3.14159265358979323846; + float c = 2.0 * M_PI * gtf_Color.r; + float sign = -1.0; + float cos_c = 1.0; + float fact = 1.0; + + // Taylor-Maclaurin series expansion for cosine + for(int i = 2; i <= 20; i += 2) + { + fact *= float(i)*float(i-1); + cos_c += sign*pow(c, float(i))/fact; + sign = -sign; + } + + color = vec4(0.5 * cos_c + 0.5, 0.0, 0.0, 1.0); + + gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; +} |