This extension is used to detect support for gl_InstanceID and gl_VertexID. However, in more recent
versions of OpenGL, this is built-in functionality. On my system, it does not list that extension,
even though it supports those features, but BGFX was not detecting that.
Updated detection to look for GL>=3.1.
Note 1: even with this change, you do need to compile BGFX with the appropriate
BGFX_CONFIG_RENDERER_OPENGL value (>=31). The default of 21 is not high enough.
Note 2: Even with all of the above, you will likely hit issues with duplicate '#version' lines in
the generated shader code. For that, see issue #xxxx.
fixes issue #2570
* Weird fix for frame rate doubling after second created window.
* Don't double buffer with vsync in metal to prevent 2x fps instead.
* Setting number of back buffers in metal if available.
* Better function call syntax.
* Matching maxFrameLatency to maximumDrawableCount in Metal backend.
* Use already injected RenderDoc dll, or load it from default location
- on Windows, if the process was launched from RenderDoc and the dll is already injected, use it
- otherwise try to load the dll from the default installation path in Program Files
- doesn't need the dll to be copied next to the exe or in the system PATH, which is not the supported way to do it according to BaldurK - see https://github.com/baldurk/renderdoc/issues/2279#issuecomment-844588691
* Restore previous implementation of findModule
* Address PR feedback
Co-authored-by: Nathan Reed <nareed@adobe.com>
Adds support on tools.mk for the msys2 environment. The OS is still
considered windows but the command line tools for mkdir and rmdir
behave as if on linux.
The variable SHADER_TMP on the makefiles also had to be quoted to make
it work on msys2.
This echo command on the makefile behaves differently between linux and gnuwin32:
```
-@echo extern const uint8_t* $(basename $(<))_pssl;>> $(@)
```
On linux the semicolon immediately ends the echo command and its output is never piped to the embedded shader's header.
If you try to fix it by quoting the string:
```
-@echo "extern const uint8_t* $(basename $(<))_pssl;" >> $(@)
```
It will work on linux but not on gnuwin32 because the quotes will appear on the outputted string.
The solution was to use printf which works consistently between the two.
Also on gnuwin32 the outputted string has 'CRLF' line endings, which clashes with the rest of the 'LF' line endings
of the embedded shaders header which were produced by shaderc.
The solution was to remove the 'CR' from the outputted string by using the tr command.
