diff options
Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/sin/sin_vec2_vert_xvary_ref.vert')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/sin/sin_vec2_vert_xvary_ref.vert | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/sin/sin_vec2_vert_xvary_ref.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/sin/sin_vec2_vert_xvary_ref.vert new file mode 100644 index 0000000000..3d1567e142 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/sin/sin_vec2_vert_xvary_ref.vert @@ -0,0 +1,62 @@ + +/* +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; + +float lerp(float a, float b, float s) +{ + return a + (b - a) * s; +} + +void main (void) +{ + float sinValues[17]; + sinValues[0] = 0.0; + sinValues[1] = 0.382683; + sinValues[2] = 0.707107; + sinValues[3] = 0.92388; + sinValues[4] = 1.0; + sinValues[5] = 0.92388; + sinValues[6] = 0.707107; + sinValues[7] = 0.382683; + sinValues[8] = 0.0; + sinValues[9] = -0.382683; + sinValues[10] = -0.707107; + sinValues[11] = -0.92388; + sinValues[12] = -1.0; + sinValues[13] = -0.923879; + sinValues[14] = -0.707107; + sinValues[15] = -0.382683; + sinValues[16] = 0.0; + + const float M_PI = 3.14159265358979323846; + vec2 c = 2.0 * M_PI * gtf_Color.rg; + float sign = 1.0; + + vec2 sin_c = vec2(0.0); + float fact; + float fact_of; + + // Taylors series expansion for sin + for(int i = 0; i < 12; i++) + { + fact = 1.0; + for(int j = 2; j <= 23; j++) + if (j <= 2 * i + 1) + fact *= float(j); + + sin_c += sign * pow(c, vec2(2.0 * float(i) + 1.0)) / fact; + sign *= -1.0; + } + + color = vec4(0.5 * sin_c + 0.5, 0.0, 1.0); + gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; +} |