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Merge pull request #1318 from ada-tv/fix/gl-swapinterval
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Fix VR Preview on Linux with Mesa drivers
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ksuprynowicz 2025-03-02 20:59:57 +01:00 committed by GitHub
commit 5b6cda34dc
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1 changed files with 28 additions and 2 deletions
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libraries/gl/src/gl/Config.cpp
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@ -76,8 +76,23 @@ static void* getGlProcessAddress(const char *namez) {
typedef Bool (*PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC) (int attribute, unsigned int *value); typedef Bool (*PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC) (int attribute, unsigned int *value);
typedef int (*PFNGLXSWAPINTERVALMESAPROC)(unsigned int interval);
typedef int (*PFNGLXGETSWAPINTERVALMESAPROC)(void);
PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC QueryCurrentRendererIntegerMESA; PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC QueryCurrentRendererIntegerMESA;
// NOTE: On Linux, we can only really use MESA_swap_control.
// SGI_swap_control is useless (can't set swap interval to zero),
// and EXT_swap_control requires Xlib structures that Qt5 doesn't
// expose to us. From what I could tell, Nvidia's driver doesn't
// have this extension, so vsync will always be enabled there.
// Because Qt5 doesn't expose Xlib structures, we can't properly
// check if the GLX extension for these is supported and we have
// to hope the driver returns NULL for them.
// (QueryCurrentRenderIntegerMESA was already doing this)
PFNGLXSWAPINTERVALMESAPROC SwapIntervalMESA;
PFNGLXGETSWAPINTERVALMESAPROC GetSwapIntervalMESA;
static void* getGlProcessAddress(const char *namez) { static void* getGlProcessAddress(const char *namez) {
return (void*)glXGetProcAddressARB((const GLubyte*)namez); return (void*)glXGetProcAddressARB((const GLubyte*)namez);
} }
@ -98,6 +113,8 @@ void gl::initModuleGl() {
#if defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID) #if defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID)
QueryCurrentRendererIntegerMESA = (PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC)getGlProcessAddress("glXQueryCurrentRendererIntegerMESA"); QueryCurrentRendererIntegerMESA = (PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC)getGlProcessAddress("glXQueryCurrentRendererIntegerMESA");
SwapIntervalMESA = (PFNGLXSWAPINTERVALMESAPROC)getGlProcessAddress("glXSwapIntervalMESA");
GetSwapIntervalMESA = (PFNGLXGETSWAPINTERVALMESAPROC)getGlProcessAddress("glXGetSwapIntervalMESA");
#endif #endif
#if defined(USE_GLES) #if defined(USE_GLES)
@ -115,8 +132,13 @@ int gl::getSwapInterval() {
GLint interval; GLint interval;
CGLGetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &interval); CGLGetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &interval);
return interval; return interval;
#else #elif defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID)
// TODO: Fill in for linux if (GetSwapIntervalMESA) {
return GetSwapIntervalMESA();
} else {
return 1;
}
#else
return 1; return 1;
#endif #endif
} }
@ -128,6 +150,10 @@ void gl::setSwapInterval(int interval) {
CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &interval); CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &interval);
#elif defined(Q_OS_ANDROID) #elif defined(Q_OS_ANDROID)
eglSwapInterval(eglGetCurrentDisplay(), interval); eglSwapInterval(eglGetCurrentDisplay(), interval);
#elif defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID)
if (SwapIntervalMESA) {
SwapIntervalMESA(interval);
}
#else #else
Q_UNUSED(interval); Q_UNUSED(interval);
#endif #endif