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Add support for (GLX|WGL)_EXT_swap_control_tear.

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This required a small public API change: SDL_GL_SetSwapInterval() now accepts
 negative values, and SDL_GL_GetSwapInterval() doesn't report errors anymore
 (if it can't work, it'll return zero as a reasonable default).

If you need to test for errors, such as a lack of swap_control_tear support,
 check the results of SDL_GL_SetSwapInterval() when you set your desired
 value.
This commit is contained in:
Ryan C. Gordon
2012-08-01 20:29:36 -04:00
parent 8974094e37
commit f32956dc1b
10 changed files with 67 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/video/SDL_video.c
View File

@@ -2578,16 +2578,13 @@ int
SDL_GL_GetSwapInterval(void)
{
if (!_this) {
SDL_UninitializedVideo();
return -1;
return 0;
} else if (_this->current_glctx == NULL) {
SDL_SetError("No OpenGL context has been made current");
return -1;
return 0;
} else if (_this->GL_GetSwapInterval) {
return _this->GL_GetSwapInterval(_this);
} else {
SDL_SetError("Getting the swap interval is not supported");
return -1;
return 0;
}
}

5
src/video/cocoa/SDL_cocoaopengl.m
View File

@@ -250,7 +250,7 @@ Cocoa_GL_GetSwapInterval(_THIS)
NSAutoreleasePool *pool;
NSOpenGLContext *nscontext;
GLint value;
int status;
int status = 0;
pool = [[NSAutoreleasePool alloc] init];
@@ -258,9 +258,6 @@ Cocoa_GL_GetSwapInterval(_THIS)
if (nscontext != nil) {
[nscontext getValues:&value forParameter:NSOpenGLCPSwapInterval];
status = (int)value;
} else {
SDL_SetError("No current OpenGL context");
status = -1;
}
[pool release];

3
src/video/directfb/SDL_DirectFB_opengl.c
View File

@@ -250,8 +250,7 @@ DirectFB_GL_SetSwapInterval(_THIS, int interval)
int
DirectFB_GL_GetSwapInterval(_THIS)
{
SDL_Unsupported();
return -1;
return 0;
}
void

10
src/video/pandora/SDL_pandora.c
View File

@@ -796,15 +796,7 @@ PND_gl_setswapinterval(_THIS, int interval)
int
PND_gl_getswapinterval(_THIS)
{
SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
if (phdata->egl_initialized != SDL_TRUE) {
SDL_SetError("PND: GLES initialization failed, no OpenGL ES support");
return -1;
}
/* Return default swap interval value */
return phdata->swapinterval;
return ((SDL_VideoData *) _this->driverdata)->swapinterval;
}
void

22
src/video/windows/SDL_windowsopengl.c
View File

@@ -112,10 +112,6 @@ WIN_GL_LoadLibrary(_THIS, const char *path)
GetProcAddress(handle, "wglDeleteContext");
_this->gl_data->wglMakeCurrent = (BOOL(WINAPI *) (HDC, HGLRC))
GetProcAddress(handle, "wglMakeCurrent");
_this->gl_data->wglSwapIntervalEXT = (void (WINAPI *) (int))
GetProcAddress(handle, "wglSwapIntervalEXT");
_this->gl_data->wglGetSwapIntervalEXT = (int (WINAPI *) (void))
GetProcAddress(handle, "wglGetSwapIntervalEXT");
if (!_this->gl_data->wglGetProcAddress ||
!_this->gl_data->wglCreateContext ||
@@ -341,7 +337,7 @@ WIN_GL_InitExtensions(_THIS, HDC hdc)
}
/* Check for WGL_ARB_pixel_format */
_this->gl_data->WGL_ARB_pixel_format = 0;
_this->gl_data->HAS_WGL_ARB_pixel_format = SDL_FALSE;
if (HasExtension("WGL_ARB_pixel_format", extensions)) {
_this->gl_data->wglChoosePixelFormatARB = (BOOL(WINAPI *)
(HDC, const int *,
@@ -354,16 +350,20 @@ WIN_GL_InitExtensions(_THIS, HDC hdc)
if ((_this->gl_data->wglChoosePixelFormatARB != NULL) &&
(_this->gl_data->wglGetPixelFormatAttribivARB != NULL)) {
_this->gl_data->WGL_ARB_pixel_format = 1;
_this->gl_data->HAS_WGL_ARB_pixel_format = SDL_TRUE;
}
}
/* Check for WGL_EXT_swap_control */
_this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_FALSE;
if (HasExtension("WGL_EXT_swap_control", extensions)) {
_this->gl_data->wglSwapIntervalEXT =
WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
_this->gl_data->wglGetSwapIntervalEXT =
WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
if (HasExtension("WGL_EXT_swap_control_tear", extensions)) {
_this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_TRUE;
}
} else {
_this->gl_data->wglSwapIntervalEXT = NULL;
_this->gl_data->wglGetSwapIntervalEXT = NULL;
@@ -397,7 +397,7 @@ WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
WIN_GL_InitExtensions(_this, hdc);
if (_this->gl_data->WGL_ARB_pixel_format) {
if (_this->gl_data->HAS_WGL_ARB_pixel_format) {
_this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
1, &pixel_format,
&matching);
@@ -611,7 +611,9 @@ WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
int
WIN_GL_SetSwapInterval(_THIS, int interval)
{
if (_this->gl_data->wglSwapIntervalEXT) {
if ((interval < 0) && (!_this->gl_data->HAS_WGL_EXT_swap_control_tear)) {
SDL_SetError("Negative swap interval unsupported in this GL");
} else if (_this->gl_data->wglSwapIntervalEXT) {
_this->gl_data->wglSwapIntervalEXT(interval);
return 0;
} else {
@@ -626,8 +628,8 @@ WIN_GL_GetSwapInterval(_THIS)
if (_this->gl_data->wglGetSwapIntervalEXT) {
return _this->gl_data->wglGetSwapIntervalEXT();
} else {
SDL_Unsupported();
return -1;
/*SDL_Unsupported();*/
return 0; /* just say we're unsync'd. */
}
}

3
src/video/windows/SDL_windowsopengl.h
View File

@@ -27,7 +27,8 @@
struct SDL_GLDriverData
{
int WGL_ARB_pixel_format;
SDL_bool HAS_WGL_ARB_pixel_format;
SDL_bool HAS_WGL_EXT_swap_control_tear;
void *(WINAPI * wglGetProcAddress) (const char *proc);
HGLRC(WINAPI * wglCreateContext) (HDC hdc);

39
src/video/x11/SDL_x11opengl.c
View File

@@ -105,6 +105,10 @@ typedef GLXContext(*PFNGLXCREATECONTEXTATTRIBSARBPROC) (Display * dpy,
#define GLX_MAX_SWAP_INTERVAL_EXT 0x20F2
#endif
#ifndef GLX_EXT_swap_control_tear
#define GLX_LATE_SWAPS_TEAR_EXT 0x20F3
#endif
#define OPENGL_REQUIRES_DLOPEN
#if defined(OPENGL_REQUIRES_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
#include <dlfcn.h>
@@ -318,11 +322,15 @@ X11_GL_InitExtensions(_THIS)
extensions = NULL;
}
/* Check for GLX_EXT_swap_control */
/* Check for GLX_EXT_swap_control(_tear) */
_this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_FALSE;
if (HasExtension("GLX_EXT_swap_control", extensions)) {
_this->gl_data->glXSwapIntervalEXT =
(int (*)(Display*,GLXDrawable,int))
X11_GL_GetProcAddress(_this, "glXSwapIntervalEXT");
if (HasExtension("GLX_EXT_swap_control_tear", extensions)) {
_this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_TRUE;
}
}
/* Check for GLX_MESA_swap_control */
@@ -615,9 +623,11 @@ static int swapinterval = -1;
int
X11_GL_SetSwapInterval(_THIS, int interval)
{
int status;
int status = -1;
if (_this->gl_data->glXSwapIntervalEXT) {
if ((interval < 0) && (!_this->gl_data->HAS_GLX_EXT_swap_control_tear)) {
SDL_SetError("Negative swap interval unsupported in this GL");
} else if (_this->gl_data->glXSwapIntervalEXT) {
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
const SDL_WindowData *windowdata = (SDL_WindowData *)
_this->current_glwin->driverdata;
@@ -625,7 +635,6 @@ X11_GL_SetSwapInterval(_THIS, int interval)
status = _this->gl_data->glXSwapIntervalEXT(display,drawable,interval);
if (status != 0) {
SDL_SetError("glxSwapIntervalEXT failed");
status = -1;
} else {
swapinterval = interval;
}
@@ -633,7 +642,6 @@ X11_GL_SetSwapInterval(_THIS, int interval)
status = _this->gl_data->glXSwapIntervalMESA(interval);
if (status != 0) {
SDL_SetError("glxSwapIntervalMESA failed");
status = -1;
} else {
swapinterval = interval;
}
@@ -641,13 +649,11 @@ X11_GL_SetSwapInterval(_THIS, int interval)
status = _this->gl_data->glXSwapIntervalSGI(interval);
if (status != 0) {
SDL_SetError("glxSwapIntervalSGI failed");
status = -1;
} else {
swapinterval = interval;
}
} else {
SDL_Unsupported();
status = -1;
}
return status;
}
@@ -660,10 +666,23 @@ X11_GL_GetSwapInterval(_THIS)
const SDL_WindowData *windowdata = (SDL_WindowData *)
_this->current_glwin->driverdata;
Window drawable = windowdata->xwindow;
unsigned int value = 0;
unsigned int allow_late_swap_tearing = 0;
unsigned int interval = 0;
if (_this->gl_data->HAS_GLX_EXT_swap_control_tear) {
_this->gl_data->glXQueryDrawable(display, drawable,
GLX_LATE_SWAPS_TEAR_EXT,
&allow_late_swap_tearing);
}
_this->gl_data->glXQueryDrawable(display, drawable,
GLX_SWAP_INTERVAL_EXT, &value);
return (int) value;
GLX_SWAP_INTERVAL_EXT, &interval);
if ((allow_late_swap_tearing) && (interval > 0)) {
return -((int) interval);
}
return (int) interval;
} else if (_this->gl_data->glXGetSwapIntervalMESA) {
return _this->gl_data->glXGetSwapIntervalMESA();
} else {

1
src/video/x11/SDL_x11opengl.h
View File

@@ -30,6 +30,7 @@
struct SDL_GLDriverData
{
SDL_bool HAS_GLX_EXT_visual_rating;
SDL_bool HAS_GLX_EXT_swap_control_tear;
void *(*glXGetProcAddress) (const GLubyte*);
XVisualInfo *(*glXChooseVisual) (Display*,int,int*);