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Transparent window for Win32 + OpenGL (#8143) 

* Transparent window for Win32 + OpenGL via DWM
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Sam Huang 2023-08-23 07:42:59 -07:00 committed by GitHub
parent f9581178de
commit c7588e4261
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1 changed files with 25 additions and 0 deletions
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25
src/video/windows/SDL_windowswindow.c
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@ -46,6 +46,16 @@
#endif
typedef HRESULT (WINAPI *DwmSetWindowAttribute_t)(HWND hwnd, DWORD dwAttribute, LPCVOID pvAttribute, DWORD cbAttribute);
/* Transparent window support */
typedef struct
{
int left_width;
int right_width;
int top_height;
int bottom_height;
} MARGINS;
typedef HRESULT (WINAPI *DwmExtendFrameIntoClientArea_t)(HWND hwnd, const MARGINS *pMarInSet);
/* Windows CE compatibility */
#ifndef SWP_NOCOPYBITS
#define SWP_NOCOPYBITS 0
@ -587,6 +597,21 @@ int WIN_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window)
return 0;
}
/* Only OpenGL has transparent framebuffer which is handled by above */
/* FIXME: Transparent window support for renderers other than OpenGL possible? */
if (window->flags & SDL_WINDOW_TRANSPARENT) {
void *handle = SDL_LoadObject("dwmapi.dll");
if (handle) {
DwmExtendFrameIntoClientArea_t DwmExtendFrameIntoClientAreaFunc = (DwmExtendFrameIntoClientArea_t)SDL_LoadFunction(handle, "DwmExtendFrameIntoClientArea");
if (DwmExtendFrameIntoClientAreaFunc) {
/* Negative margins create "sheet of glass" effect, thus transparent */
MARGINS margins = {-1, -1, -1, -1};
DwmExtendFrameIntoClientAreaFunc(hwnd, &margins);
}
SDL_UnloadObject(handle);
}
}
/* The rest of this macro mess is for OpenGL or OpenGL ES windows */
#ifdef SDL_VIDEO_OPENGL_ES2
if ((_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES ||