src/video/winrt/SDL_winrtvideo.cpp
author David Ludwig <dludwig@pobox.com>
Tue, 27 Aug 2013 12:56:49 -0400
changeset 8503 90b33b6c6ab9
parent 8501 260da37dd755
child 8505 a76a3842c9eb
permissions -rw-r--r--
WinRT: code cleanup wrt. display mode(s)
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_WINRT
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/* WinRT SDL video driver implementation
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   Initial work on this was done by David Ludwig (dludwig@pobox.com), and
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   was based off of SDL's "dummy" video driver.
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 */
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/* Windows includes */
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#include <agile.h>
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using namespace Windows::UI::Core;
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/* SDL includes */
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extern "C" {
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "../../events/SDL_events_c.h"
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#include "../../render/SDL_sysrender.h"
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#include "SDL_syswm.h"
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}
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#include "../../core/winrt/SDL_winrtapp.h"
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#include "SDL_winrtevents_c.h"
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#include "SDL_winrtmouse.h"
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extern SDL_WinRTApp ^ SDL_WinRTGlobalApp;
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/* Initialization/Query functions */
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static int WINRT_VideoInit(_THIS);
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static int WINRT_InitModes(_THIS);
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static int WINRT_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
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static void WINRT_VideoQuit(_THIS);
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/* Window functions */
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static int WINRT_CreateWindow(_THIS, SDL_Window * window);
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static void WINRT_DestroyWindow(_THIS, SDL_Window * window);
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static SDL_bool WINRT_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info);
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/* Internal window data */
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struct SDL_WindowData
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{
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    SDL_Window *sdlWindow;
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    Platform::Agile<Windows::UI::Core::CoreWindow> coreWindow;
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};
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/* The global, WinRT, SDL Window.
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   For now, SDL/WinRT only supports one window (due to platform limitations of
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   WinRT.
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*/
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SDL_Window * WINRT_GlobalSDLWindow = NULL;
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/* The global, WinRT, video device.
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*/
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SDL_VideoDevice * WINRT_GlobalSDLVideoDevice = NULL;
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/* WinRT driver bootstrap functions */
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static int
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WINRT_Available(void)
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{
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    return (1);
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}
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static void
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WINRT_DeleteDevice(SDL_VideoDevice * device)
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{
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    if (device == WINRT_GlobalSDLVideoDevice) {
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        WINRT_GlobalSDLVideoDevice = NULL;
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    }
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    SDL_free(device);
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}
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static SDL_VideoDevice *
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WINRT_CreateDevice(int devindex)
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{
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    SDL_VideoDevice *device;
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    /* Initialize all variables that we clean on shutdown */
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    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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    if (!device) {
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        SDL_OutOfMemory();
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        if (device) {
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            SDL_free(device);
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        }
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        return (0);
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    }
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    /* Set the function pointers */
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    device->VideoInit = WINRT_VideoInit;
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    device->VideoQuit = WINRT_VideoQuit;
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    device->CreateWindow = WINRT_CreateWindow;
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    device->DestroyWindow = WINRT_DestroyWindow;
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    device->SetDisplayMode = WINRT_SetDisplayMode;
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    device->PumpEvents = WINRT_PumpEvents;
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    device->GetWindowWMInfo = WINRT_GetWindowWMInfo;
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    device->free = WINRT_DeleteDevice;
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    WINRT_GlobalSDLVideoDevice = device;
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    return device;
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}
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#define WINRTVID_DRIVER_NAME "winrt"
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VideoBootStrap WINRT_bootstrap = {
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    WINRTVID_DRIVER_NAME, "SDL WinRT video driver",
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    WINRT_Available, WINRT_CreateDevice
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};
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int
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WINRT_VideoInit(_THIS)
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{
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    if (WINRT_InitModes(_this) < 0) {
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        return -1;
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    }
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    WINRT_InitMouse(_this);
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    return 0;
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}
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SDL_DisplayMode
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WINRT_CalcDisplayModeUsingNativeWindow()
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{
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    // Create an empty, zeroed-out display mode:
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    SDL_DisplayMode mode;
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    SDL_zero(mode);
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    // Fill in most fields:
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    mode.format = SDL_PIXELFORMAT_RGB888;
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    mode.refresh_rate = 0;  // TODO, WinRT: see if refresh rate data is available, or relevant (for WinRT apps)
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    mode.driverdata = NULL;
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    // Calculate the display size given the window size, taking into account
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    // the current display's DPI:
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    const float currentDPI = Windows::Graphics::Display::DisplayProperties::LogicalDpi; 
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    const float dipsPerInch = 96.0f;
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    mode.w = (int) ((CoreWindow::GetForCurrentThread()->Bounds.Width * currentDPI) / dipsPerInch);
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    mode.h = (int) ((CoreWindow::GetForCurrentThread()->Bounds.Height * currentDPI) / dipsPerInch);
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    return mode;
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}
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static int
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WINRT_InitModes(_THIS)
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{
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    SDL_DisplayMode mode = WINRT_CalcDisplayModeUsingNativeWindow();
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    if (SDL_AddBasicVideoDisplay(&mode) < 0) {
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        return -1;
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    }
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    SDL_AddDisplayMode(&_this->displays[0], &mode);
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    return 0;
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}
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static int
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WINRT_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
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{
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    return 0;
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}
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void
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WINRT_VideoQuit(_THIS)
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{
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    WINRT_QuitMouse(_this);
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}
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int
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WINRT_CreateWindow(_THIS, SDL_Window * window)
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{
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    // Make sure that only one window gets created, at least until multimonitor
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    // support is added.
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    if (WINRT_GlobalSDLWindow != NULL) {
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        SDL_SetError("WinRT only supports one window");
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        return -1;
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    }
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    SDL_WindowData *data = new SDL_WindowData;
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    if (!data) {
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        SDL_OutOfMemory();
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        return -1;
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    }
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    window->driverdata = data;
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    data->sdlWindow = window;
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    data->coreWindow = CoreWindow::GetForCurrentThread();
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    /* Make sure the window is considered to be positioned at {0,0},
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       and is considered fullscreen, shown, and the like.
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    */
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    window->x = 0;
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    window->y = 0;
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    window->flags =
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        SDL_WINDOW_FULLSCREEN |
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        SDL_WINDOW_SHOWN |
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        SDL_WINDOW_BORDERLESS |
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        SDL_WINDOW_MAXIMIZED |
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        SDL_WINDOW_INPUT_GRABBED;
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    /* WinRT does not, as of this writing, appear to support app-adjustable
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       window sizes.  Set the window size to whatever the native WinRT
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       CoreWindow is set at.
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       TODO, WinRT: if and when non-fullscreen XAML control support is added to SDL, consider making those resizable via SDL_Window's interfaces.
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    */
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    window->w = _this->displays[0].current_mode.w;
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    window->h = _this->displays[0].current_mode.h;
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    /* Make sure the WinRT app's IFramworkView can post events on
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       behalf of SDL:
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    */
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    WINRT_GlobalSDLWindow = window;
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    /* All done! */
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    return 0;
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}
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void
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WINRT_DestroyWindow(_THIS, SDL_Window * window)
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{
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    SDL_WindowData * data = (SDL_WindowData *) window->driverdata;
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    if (WINRT_GlobalSDLWindow == window) {
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        WINRT_GlobalSDLWindow = NULL;
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    }
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    if (data) {
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        // Delete the internal window data:
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        delete data;
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        data = NULL;
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    }
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}
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SDL_bool
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WINRT_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
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{
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    SDL_WindowData * data = (SDL_WindowData *) window->driverdata;
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    if (info->version.major <= SDL_MAJOR_VERSION) {
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        info->subsystem = SDL_SYSWM_WINRT;
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        info->info.winrt.window = reinterpret_cast<IUnknown *>(data->coreWindow.Get());
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        return SDL_TRUE;
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    } else {
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        SDL_SetError("Application not compiled with SDL %d.%d\n",
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                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
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        return SDL_FALSE;
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    }
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    return SDL_FALSE;
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}
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#endif /* SDL_VIDEO_DRIVER_WINRT */
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