1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2021 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_WINDOWS && SDL_VIDEO_OPENGL_EGL
24
25 #include "SDL_windowsvideo.h"
26 #include "SDL_windowsopengles.h"
27 #include "SDL_windowsopengl.h"
28
29 /* EGL implementation of SDL OpenGL support */
30
31 int
WIN_GLES_LoadLibrary(_THIS,const char * path)32 WIN_GLES_LoadLibrary(_THIS, const char *path) {
33
34 /* If the profile requested is not GL ES, switch over to WIN_GL functions */
35 if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
36 #if SDL_VIDEO_OPENGL_WGL
37 WIN_GLES_UnloadLibrary(_this);
38 _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
39 _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
40 _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
41 _this->GL_CreateContext = WIN_GL_CreateContext;
42 _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
43 _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
44 _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
45 _this->GL_SwapWindow = WIN_GL_SwapWindow;
46 _this->GL_DeleteContext = WIN_GL_DeleteContext;
47 return WIN_GL_LoadLibrary(_this, path);
48 #else
49 return SDL_SetError("SDL not configured with OpenGL/WGL support");
50 #endif
51 }
52
53 if (_this->egl_data == NULL) {
54 return SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0);
55 }
56
57 return 0;
58 }
59
60 SDL_GLContext
WIN_GLES_CreateContext(_THIS,SDL_Window * window)61 WIN_GLES_CreateContext(_THIS, SDL_Window * window)
62 {
63 SDL_GLContext context;
64 SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
65
66 #if SDL_VIDEO_OPENGL_WGL
67 if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
68 /* Switch to WGL based functions */
69 WIN_GLES_UnloadLibrary(_this);
70 _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
71 _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
72 _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
73 _this->GL_CreateContext = WIN_GL_CreateContext;
74 _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
75 _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
76 _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
77 _this->GL_SwapWindow = WIN_GL_SwapWindow;
78 _this->GL_DeleteContext = WIN_GL_DeleteContext;
79
80 if (WIN_GL_LoadLibrary(_this, NULL) != 0) {
81 return NULL;
82 }
83
84 return WIN_GL_CreateContext(_this, window);
85 }
86 #endif
87
88 context = SDL_EGL_CreateContext(_this, data->egl_surface);
89 return context;
90 }
91
92 void
WIN_GLES_DeleteContext(_THIS,SDL_GLContext context)93 WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
94 {
95 SDL_EGL_DeleteContext(_this, context);
96 WIN_GLES_UnloadLibrary(_this);
97 }
98
99 SDL_EGL_SwapWindow_impl(WIN)
SDL_EGL_MakeCurrent_impl(WIN)100 SDL_EGL_MakeCurrent_impl(WIN)
101
102 int
103 WIN_GLES_SetupWindow(_THIS, SDL_Window * window)
104 {
105 /* The current context is lost in here; save it and reset it. */
106 SDL_WindowData *windowdata = (SDL_WindowData *) window->driverdata;
107 SDL_Window *current_win = SDL_GL_GetCurrentWindow();
108 SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
109
110 if (_this->egl_data == NULL) {
111 /* !!! FIXME: commenting out this assertion is (I think) incorrect; figure out why driver_loaded is wrong for ANGLE instead. --ryan. */
112 #if 0 /* When hint SDL_HINT_OPENGL_ES_DRIVER is set to "1" (e.g. for ANGLE support), _this->gl_config.driver_loaded can be 0, while the below lines function. */
113 SDL_assert(!_this->gl_config.driver_loaded);
114 #endif
115 if (SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0) < 0) {
116 SDL_EGL_UnloadLibrary(_this);
117 return -1;
118 }
119 _this->gl_config.driver_loaded = 1;
120 }
121
122 /* Create the GLES window surface */
123 windowdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windowdata->hwnd);
124
125 if (windowdata->egl_surface == EGL_NO_SURFACE) {
126 return SDL_SetError("Could not create GLES window surface");
127 }
128
129 return WIN_GLES_MakeCurrent(_this, current_win, current_ctx);
130 }
131
132 #endif /* SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL */
133
134 /* vi: set ts=4 sw=4 expandtab: */
135