Commit 34415c4557400f6706d06a533d61db2fcfc7b754
2015-03-20T12:23:53
Windows: support for OpenGL extension WGL_ARB_context_flush_control.
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diff --git a/src/video/windows/SDL_windowsopengl.c b/src/video/windows/SDL_windowsopengl.c
index 71855c8..bab97fa 100644
--- a/src/video/windows/SDL_windowsopengl.c
+++ b/src/video/windows/SDL_windowsopengl.c
@@ -74,6 +74,13 @@
#define WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB 0x20A9
#endif
+#ifndef WGL_ARB_context_flush_control
+#define WGL_ARB_context_flush_control
+#define WGL_CONTEXT_RELEASE_BEHAVIOR_ARB 0x2097
+#define WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB 0x0000
+#define WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB 0x2098
+#endif
+
typedef HGLRC(APIENTRYP PFNWGLCREATECONTEXTATTRIBSARBPROC) (HDC hDC,
HGLRC
hShareContext,
@@ -405,6 +412,11 @@ WIN_GL_InitExtensions(_THIS)
_this->gl_data->HAS_WGL_EXT_create_context_es2_profile = SDL_TRUE;
}
+ /* Check for GLX_ARB_context_flush_control */
+ if (HasExtension("WGL_ARB_context_flush_control", extensions)) {
+ _this->gl_data->HAS_WGL_ARB_context_flush_control = SDL_TRUE;
+ }
+
_this->gl_data->wglMakeCurrent(hdc, NULL);
_this->gl_data->wglDeleteContext(hglrc);
ReleaseDC(hwnd, hdc);
@@ -648,8 +660,8 @@ WIN_GL_CreateContext(_THIS, SDL_Window * window)
SDL_SetError("GL 3.x is not supported");
context = temp_context;
} else {
- /* max 8 attributes plus terminator */
- int attribs[9] = {
+ /* max 10 attributes plus terminator */
+ int attribs[11] = {
WGL_CONTEXT_MAJOR_VERSION_ARB, _this->gl_config.major_version,
WGL_CONTEXT_MINOR_VERSION_ARB, _this->gl_config.minor_version,
0
@@ -668,6 +680,14 @@ WIN_GL_CreateContext(_THIS, SDL_Window * window)
attribs[iattr++] = _this->gl_config.flags;
}
+ /* only set if wgl extension is available */
+ if( _this->gl_data->HAS_WGL_ARB_context_flush_control ) {
+ attribs[iattr++] = WGL_CONTEXT_RELEASE_BEHAVIOR_ARB;
+ attribs[iattr++] = _this->gl_config.release_behavior ?
+ WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB :
+ WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB;
+ }
+
attribs[iattr++] = 0;
/* Create the GL 3.x context */
diff --git a/src/video/windows/SDL_windowsopengl.h b/src/video/windows/SDL_windowsopengl.h
index b96e0ac..b95b90f 100644
--- a/src/video/windows/SDL_windowsopengl.h
+++ b/src/video/windows/SDL_windowsopengl.h
@@ -30,6 +30,7 @@ struct SDL_GLDriverData
SDL_bool HAS_WGL_ARB_pixel_format;
SDL_bool HAS_WGL_EXT_swap_control_tear;
SDL_bool HAS_WGL_EXT_create_context_es2_profile;
+ SDL_bool HAS_WGL_ARB_context_flush_control;
void *(WINAPI * wglGetProcAddress) (const char *proc);
HGLRC(WINAPI * wglCreateContext) (HDC hdc);