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OpenGL: Fix SetSwapInterval logic. 

- Don't use GLX extension functions unless they are supported on the
connection. GLEW only checks for client library support.

- Don't try to set swap interval using glXSwapIntervalSGI when vsync is
not requested.

Fixes https://gitlab.com/kicad/code/kicad/issues/11751
This commit is contained in:
Alex 2022-06-07 22:33:28 +03:00 committed by Seth Hillbrand
parent f5fe1d5462
commit 0e2d3236b5
1 changed files with 44 additions and 44 deletions
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26
include/gl_utils.h
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@ -45,15 +45,15 @@ public:
/// Windows would include <wglext.h> and call wglSwapIntervalEXT
#if defined( __linux__ ) && !defined( KICAD_USE_EGL )
Display *dpy = glXGetCurrentDisplay();
GLXDrawable drawable = glXGetCurrentDrawable();
std::string vendor( reinterpret_cast<const char*>( glGetString( GL_VENDOR ) ) );
bool is_mesa = ( vendor.find( "Mesa" ) != std::string::npos );
if( !is_mesa && glXSwapIntervalEXT && glXQueryDrawable && dpy && drawable )
if( Display* dpy = glXGetCurrentDisplay() )
{
GLXDrawable drawable = glXGetCurrentDrawable();
std::string exts( glXQueryExtensionsString( dpy, DefaultScreen( dpy ) ) );
if( glXSwapIntervalEXT && glXQueryDrawable && drawable
&& exts.find( "GLX_EXT_swap_control" ) != std::string::npos )
{
if( aVal < 0 )
{
if( exts.find( "GLX_EXT_swap_control_tear" ) == std::string::npos )
@ -67,7 +67,8 @@ public:
// enabled on the drawable.
unsigned lateSwapsEnabled = 0;
glXQueryDrawable( dpy, drawable, GLX_LATE_SWAPS_TEAR_EXT, &lateSwapsEnabled );
glXQueryDrawable( dpy, drawable, GLX_LATE_SWAPS_TEAR_EXT,
&lateSwapsEnabled );
if( !lateSwapsEnabled )
{
@ -83,7 +84,8 @@ public:
return clampedInterval;
}
if( glXSwapIntervalMESA &&glXGetSwapIntervalMESA )
if( glXSwapIntervalMESA && glXGetSwapIntervalMESA
&& exts.find( "GLX_MESA_swap_control" ) != std::string::npos )
{
if( aVal < 0 )
aVal = 0;
@ -92,16 +94,15 @@ public:
return glXGetSwapIntervalMESA();
}
if( glXSwapIntervalSGI )
if( aVal > 0 && glXSwapIntervalSGI
&& exts.find( "GLX_SGI_swap_control" ) != std::string::npos )
{
if( aVal < 1 )
aVal = 1;
if( glXSwapIntervalSGI( aVal ) )
glXSwapIntervalSGI( 1 );
return 1;
}
}
return std::numeric_limits<int>::max();
#else
@ -111,4 +112,3 @@ public:
};
#endif /* GL_CONTEXT_MANAGER_H */