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Windows: support for OpenGL extension WGL_ARB_context_flush_control.

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icculus committed Mar 20, 2015
1 parent f5d9641 commit 34415c4557400f6706d06a533d61db2fcfc7b754
Showing with 23 additions and 2 deletions.
  1. +22 −2 src/video/windows/SDL_windowsopengl.c
  2. +1 −0 src/video/windows/SDL_windowsopengl.h
@@ -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 */
@@ -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);

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