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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary_ref.vert | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary_ref.vert')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary_ref.vert | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary_ref.vert b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary_ref.vert new file mode 100644 index 0000000000..b6c2d5f4ea --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL/atan/atan_float_vert_xvaryyvary_ref.vert @@ -0,0 +1,68 @@ + +/* +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_Vertex; +attribute vec4 gtf_Color; +uniform mat4 gtf_ModelViewProjectionMatrix; +varying vec4 color; + +void main (void) +{ + const float M_PI = 3.14159265358979323846; + float x = 2.0 * (gtf_Color.g - 0.5); + float y = 2.0 * (gtf_Color.b - 0.5); + float atan_c = 0.0; + float scale = 1.0; + float sign = 1.0; + vec4 result = vec4(0.0, 0.0, 0.0, 1.0); + const float epsilon = 1.0e-4; + + // Avoid evaluating atan(0, x) for x < epsilon because it's implementation-dependent + if(x > epsilon || abs(y) > epsilon) + { + if(x < 0.0 ^^ y < 0.0) + { + sign = -1.0; + } + + if(abs(y) <= abs(x)) + { + float c = abs(y / x); + + // Taylors series expansion for atan + for(int i = 1; i < 12; i += 2) + { + atan_c += scale * pow(c, float(i)) / float(i); + scale *= -1.0; + } + + result = vec4(sign * atan_c / (2.0 * M_PI) + 0.5, 0.0, 0.0, 1.0); + } + else + { + float c = abs(x / y); + + // Taylors series expansion for atan + for(int i = 1; i < 12; i += 2) + { + atan_c += scale * pow(c, float(i)) / float(i); + scale *= -1.0; + } + + result = vec4(sign * (M_PI / 2.0 - atan_c) / (2.0 * M_PI) + 0.5, 0.0, 0.0, 1.0); + } + + if(x < 0.0) + if(y < 0.0) result.r -= 0.5; + else if(y > 0.0) result.r += 0.5; + } + + color = result; + gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex; +} + |