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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - bitfieldExtract is marked as a built-in function on OpenGL ES 3.0, but was added in OpenGL ES 3.1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101666#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - bitfieldExtract is marked as a built-in function on OpenGL ES 3.0, but was added in OpenGL ES 3.1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101666">bug 101666</a>
from <span class="vcard"><a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> <span class="fn">Ilia Mirkin</span></a>
</span></b>
<pre>Just to illustrate my point further (and apologies for not properly
compensating for bz's unfortunate email-to-bug integration):
$ cat foo.shader_test
[require]
GL ES >= 3.0
GLSL ES >= 3.00
[vertex shader]
#version 300 es
uint bitfieldExtract(uint val, int off, int size) {
uint mask = uint((1 << size) - 1);
return uint(val >> off) & mask;
}
uint bitfieldReverse(uint bits) {
return bits;
}
float interpolateAtCentroid(float foo) {
return foo;
}
void main() {
gl_Position = vec4(bitfieldExtract(1u, 2, 3));
}
[fragment shader]
#version 300 es
out vec4 color;
void main() { color = vec4(0,1,0,1); }
[test]
link success
$ bin/shader_runner_gles3 foo.shader_test -auto
Failed to compile VS: 0:3(6): error: A shader cannot redefine or overload
built-in function `bitfieldExtract' in GLSL ES 3.00
0:8(6): error: A shader cannot redefine or overload built-in function
`bitfieldReverse' in GLSL ES 3.00
0:12(7): error: A shader cannot redefine or overload built-in function
`interpolateAtCentroid' in GLSL ES 3.00
0:17(21): error: no matching function for call to `bitfieldExtract(uint, int,
int)'; candidates are:
0:17(16): error: cannot construct `vec4' from a non-numeric data type
PIGLIT: {"result": "fail" }</pre>
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