1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22
23 #if SDL_VIDEO_DRIVER_WINRT && SDL_VIDEO_OPENGL_EGL
24
25 /* EGL implementation of SDL OpenGL support */
26
27 #include "SDL_winrtvideo_cpp.h"
28 extern "C" {
29 #include "SDL_winrtopengles.h"
30 #include "SDL_loadso.h"
31 }
32
33 /* Windows includes */
34 #include <wrl/client.h>
35 using namespace Windows::UI::Core;
36
37 /* ANGLE/WinRT constants */
38 static const int ANGLE_D3D_FEATURE_LEVEL_ANY = 0;
39 #define EGL_PLATFORM_ANGLE_ANGLE 0x3202
40 #define EGL_PLATFORM_ANGLE_TYPE_ANGLE 0x3203
41 #define EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE 0x3204
42 #define EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE 0x3205
43 #define EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE 0x3208
44 #define EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE 0x3209
45 #define EGL_PLATFORM_ANGLE_DEVICE_TYPE_WARP_ANGLE 0x320B
46 #define EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE 0x320F
47
48 #define EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER 0x320B
49
50
51 /*
52 * SDL/EGL top-level implementation
53 */
54
55 extern "C" int
WINRT_GLES_LoadLibrary(_THIS,const char * path)56 WINRT_GLES_LoadLibrary(_THIS, const char *path)
57 {
58 SDL_VideoData *video_data = (SDL_VideoData *)_this->driverdata;
59
60 if (SDL_EGL_LoadLibrary(_this, path, EGL_DEFAULT_DISPLAY) != 0) {
61 return -1;
62 }
63
64 /* Load ANGLE/WinRT-specific functions */
65 CreateWinrtEglWindow_Old_Function CreateWinrtEglWindow = (CreateWinrtEglWindow_Old_Function) SDL_LoadFunction(_this->egl_data->egl_dll_handle, "CreateWinrtEglWindow");
66 if (CreateWinrtEglWindow) {
67 /* 'CreateWinrtEglWindow' was found, which means that an an older
68 * version of ANGLE/WinRT is being used. Continue setting up EGL,
69 * as appropriate to this version of ANGLE.
70 */
71
72 /* Create an ANGLE/WinRT EGL-window */
73 /* TODO, WinRT: check for XAML usage before accessing the CoreWindow, as not doing so could lead to a crash */
74 CoreWindow ^ native_win = CoreWindow::GetForCurrentThread();
75 Microsoft::WRL::ComPtr<IUnknown> cpp_win = reinterpret_cast<IUnknown *>(native_win);
76 HRESULT result = CreateWinrtEglWindow(cpp_win, ANGLE_D3D_FEATURE_LEVEL_ANY, &(video_data->winrtEglWindow));
77 if (FAILED(result)) {
78 return -1;
79 }
80
81 /* Call eglGetDisplay and eglInitialize as appropriate. On other
82 * platforms, this would probably get done by SDL_EGL_LoadLibrary,
83 * however ANGLE/WinRT's current implementation (as of Mar 22, 2014) of
84 * eglGetDisplay requires that a C++ object be passed into it, so the
85 * call will be made in this file, a C++ file, instead.
86 */
87 Microsoft::WRL::ComPtr<IUnknown> cpp_display = video_data->winrtEglWindow;
88 _this->egl_data->egl_display = ((eglGetDisplay_Old_Function)_this->egl_data->eglGetDisplay)(cpp_display);
89 if (!_this->egl_data->egl_display) {
90 return SDL_SetError("Could not get Windows 8.0 EGL display");
91 }
92
93 if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
94 return SDL_SetError("Could not initialize Windows 8.0 EGL");
95 }
96 } else {
97 /* Declare some ANGLE/EGL initialization property-sets, as suggested by
98 * MSOpenTech's ANGLE-for-WinRT template apps:
99 */
100 const EGLint defaultDisplayAttributes[] =
101 {
102 EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
103 EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL_TRUE,
104 EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE, EGL_TRUE,
105 EGL_NONE,
106 };
107
108 const EGLint fl9_3DisplayAttributes[] =
109 {
110 EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
111 EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE, 9,
112 EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE, 3,
113 EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL_TRUE,
114 EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE, EGL_TRUE,
115 EGL_NONE,
116 };
117
118 const EGLint warpDisplayAttributes[] =
119 {
120 EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
121 EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_DEVICE_TYPE_WARP_ANGLE,
122 EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL_TRUE,
123 EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE, EGL_TRUE,
124 EGL_NONE,
125 };
126
127 /* 'CreateWinrtEglWindow' was NOT found, which either means that a
128 * newer version of ANGLE/WinRT is being used, or that we don't have
129 * a valid copy of ANGLE.
130 *
131 * Try loading ANGLE as if it were the newer version.
132 */
133 eglGetPlatformDisplayEXT_Function eglGetPlatformDisplayEXT = (eglGetPlatformDisplayEXT_Function)_this->egl_data->eglGetProcAddress("eglGetPlatformDisplayEXT");
134 if (!eglGetPlatformDisplayEXT) {
135 return SDL_SetError("Could not retrieve ANGLE/WinRT display function(s)");
136 }
137
138 #if (WINAPI_FAMILY != WINAPI_FAMILY_PHONE_APP)
139 /* Try initializing EGL at D3D11 Feature Level 10_0+ (which is not
140 * supported on WinPhone 8.x.
141 */
142 _this->egl_data->egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, EGL_DEFAULT_DISPLAY, defaultDisplayAttributes);
143 if (!_this->egl_data->egl_display) {
144 return SDL_SetError("Could not get 10_0+ EGL display");
145 }
146
147 if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE)
148 #endif
149 {
150 /* Try initializing EGL at D3D11 Feature Level 9_3, in case the
151 * 10_0 init fails, or we're on Windows Phone (which only supports
152 * 9_3).
153 */
154 _this->egl_data->egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, EGL_DEFAULT_DISPLAY, fl9_3DisplayAttributes);
155 if (!_this->egl_data->egl_display) {
156 return SDL_SetError("Could not get 9_3 EGL display");
157 }
158
159 if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
160 /* Try initializing EGL at D3D11 Feature Level 11_0 on WARP
161 * (a Windows-provided, software rasterizer) if all else fails.
162 */
163 _this->egl_data->egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, EGL_DEFAULT_DISPLAY, warpDisplayAttributes);
164 if (!_this->egl_data->egl_display) {
165 return SDL_SetError("Could not get WARP EGL display");
166 }
167
168 if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
169 return SDL_SetError("Could not initialize WinRT 8.x+ EGL");
170 }
171 }
172 }
173 }
174
175 return 0;
176 }
177
178 extern "C" void
WINRT_GLES_UnloadLibrary(_THIS)179 WINRT_GLES_UnloadLibrary(_THIS)
180 {
181 SDL_VideoData *video_data = (SDL_VideoData *)_this->driverdata;
182
183 /* Release SDL's own COM reference to the ANGLE/WinRT IWinrtEglWindow */
184 if (video_data->winrtEglWindow) {
185 video_data->winrtEglWindow->Release();
186 video_data->winrtEglWindow = nullptr;
187 }
188
189 /* Perform the bulk of the unloading */
190 SDL_EGL_UnloadLibrary(_this);
191 }
192
193 extern "C" {
194 SDL_EGL_CreateContext_impl(WINRT)
195 SDL_EGL_SwapWindow_impl(WINRT)
196 SDL_EGL_MakeCurrent_impl(WINRT)
197 }
198
199 #endif /* SDL_VIDEO_DRIVER_WINRT && SDL_VIDEO_OPENGL_EGL */
200
201 /* vi: set ts=4 sw=4 expandtab: */
202
203