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Implements swap_interval for MSWindows.

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This commit is contained in:
MatthiasWM 2023-11-29 13:16:24 +01:00
parent f3348e8120
commit 75c879e2ff
2 changed files with 53 additions and 0 deletions
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2
src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.H
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@ -30,6 +30,8 @@ class Fl_WinAPI_Gl_Window_Driver : public Fl_Gl_Window_Driver {
int mode_(int m, const int *a) FL_OVERRIDE;
void make_current_after() FL_OVERRIDE;
void swap_buffers() FL_OVERRIDE;
void swap_interval(int) FL_OVERRIDE;
int swap_interval() const FL_OVERRIDE;
void invalidate() FL_OVERRIDE {}
int flush_begin(char& valid_f) FL_OVERRIDE;
Fl_Gl_Choice *find(int m, const int *alistp) FL_OVERRIDE;

51
src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.cxx
View File

@ -325,6 +325,57 @@ void Fl_WinAPI_Gl_Window_Driver::swap_buffers() {
# endif
}
// Start of swap_interval implementation in the three possibel ways for X11
// -1 = not yet initialized, 0 = none found, 1 = GLX, 2 = MESA, 3 = SGI
static signed char swap_interval_type = -1;
typedef const char *(WINAPI *WGL_Get_Extension_String_Proc)();
typedef BOOL (WINAPI *WGL_Swap_Iterval_Proc)(int interval);
typedef int (WINAPI *WGL_Get_Swap_Iterval_Proc)();
static WGL_Swap_Iterval_Proc wglSwapIntervalEXT = NULL;
static WGL_Get_Swap_Iterval_Proc wglGetSwapIntervalEXT = NULL;
static void init_swap_interval() {
if (swap_interval_type != -1)
return;
swap_interval_type = 0;
WGL_Get_Extension_String_Proc wglGetExtensionsStringEXT = NULL;
wglGetExtensionsStringEXT = (WGL_Get_Extension_String_Proc)wglGetProcAddress("wglGetExtensionsStringEXT");
if (!wglGetExtensionsStringEXT)
return;
const char *extensions = wglGetExtensionsStringEXT();
if (extensions && strstr(extensions, "WGL_EXT_swap_control")) {
wglSwapIntervalEXT = (WGL_Swap_Iterval_Proc)wglGetProcAddress("wglSwapIntervalEXT");
wglGetSwapIntervalEXT = (WGL_Get_Swap_Iterval_Proc)wglGetProcAddress("wglGetSwapIntervalEXT");
swap_interval_type = 1;
}
}
void Fl_WinAPI_Gl_Window_Driver::swap_interval(int interval) {
if (swap_interval_type == -1)
init_swap_interval();
if (swap_interval_type == 1) {
if (wglSwapIntervalEXT)
wglSwapIntervalEXT(interval);
}
}
int Fl_WinAPI_Gl_Window_Driver::swap_interval() const {
if (swap_interval_type == -1)
init_swap_interval();
int interval = -1;
if (swap_interval_type == 1) {
if (wglGetSwapIntervalEXT)
interval = wglGetSwapIntervalEXT();
}
return interval;
}
// end of swap_interval implementation
#if HAVE_GL_OVERLAY
#endif