https://bugs.freedesktop.org/show_bug.cgi?id=101666
Bug ID: 101666
Summary: bitfieldExtract is marked as a built-in function on
OpenGL ES 3.0, but was added in OpenGL ES 3.1
Product: Mesa
Version: 17.1
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: glsl-compiler
Assignee: mesa-dev@lists.freedesktop.org
Reporter: ds84...@gmail.com
QA Contact: intel-3d-b...@lists.freedesktop.org
In the Ubershaders Dolphin PR a bitfieldExtract function is defined since the
context that Dolphin uses on Android is an OpenGL ES 3.0 context.
During shader compilation, Mesa throws an error when encountering
bitfieldExtract, even though bitfieldExtract is not defined in OpenGL ES 3.0.
Relevant Khronos reference page here:
https://www.khronos.org/registry/OpenGL-Refpages/es3.1/html/bitfieldExtract.xhtml
To replicate this bug, define bitfieldExtract in an OpenGL ES 3.0 context. The
actual implementation shouldn't matter, but just to be safe, heres the
implementation used inside of Dolphin:
uint bitfieldExtract(uint val, int off, int size) {
uint mask = uint((1 << size) - 1);
return uint(val >> off) & mask;
}
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