Atlas - SDL_windowsopengles.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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#include "SDL_log.h"
29
30/* EGL implementation of SDL OpenGL support */
31
32int
33WIN_GLES_LoadLibrary(_THIS, const char *path) {
34
35    /* If the profile requested is not GL ES, switch over to WIN_GL functions  */
36    if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
37#if SDL_VIDEO_OPENGL_WGL
38        WIN_GLES_UnloadLibrary(_this);
39        _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
40        _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
41        _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
42        _this->GL_CreateContext = WIN_GL_CreateContext;
43        _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
44        _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
45        _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
46        _this->GL_SwapWindow = WIN_GL_SwapWindow;
47        _this->GL_DeleteContext = WIN_GL_DeleteContext;
48        return WIN_GL_LoadLibrary(_this, path);
49#else
50        return SDL_SetError("SDL not configured with OpenGL/WGL support");
51#endif
52    }
53    
54    if (_this->egl_data == NULL) {
55        return SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0);
56    }
57
58    return 0;
59}
60
61SDL_GLContext
62WIN_GLES_CreateContext(_THIS, SDL_Window * window)
63{
64    SDL_GLContext context;
65    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
66
67#if SDL_VIDEO_OPENGL_WGL
68    if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
69        /* Switch to WGL based functions */
70        WIN_GLES_UnloadLibrary(_this);
71        _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
72        _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
73        _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
74        _this->GL_CreateContext = WIN_GL_CreateContext;
75        _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
76        _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
77        _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
78        _this->GL_SwapWindow = WIN_GL_SwapWindow;
79        _this->GL_DeleteContext = WIN_GL_DeleteContext;
80
81        if (WIN_GL_LoadLibrary(_this, NULL) != 0) {
82            return NULL;
83        }
84
85        return WIN_GL_CreateContext(_this, window);
86    }
87#endif
88
89    context = SDL_EGL_CreateContext(_this, data->egl_surface);
90    return context;
91}
92
93void
94WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
95{
96    SDL_EGL_DeleteContext(_this, context);
97    WIN_GLES_UnloadLibrary(_this);
98}
99
100SDL_EGL_SwapWindow_impl(WIN)
101SDL_EGL_MakeCurrent_impl(WIN)
102
103int
104WIN_GLES_SetupWindow(_THIS, SDL_Window * window)
105{
106    /* The current context is lost in here; save it and reset it. */
107    SDL_WindowData *windowdata = (SDL_WindowData *) window->driverdata;
108    SDL_Window *current_win = SDL_GL_GetCurrentWindow();
109    SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
110
111
112    if (_this->egl_data == NULL) {
113        if (SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0) < 0) {
114            SDL_EGL_UnloadLibrary(_this);
115            return -1;
116        }
117    }
118  
119    /* Create the GLES window surface */
120    windowdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windowdata->hwnd);
121
122    if (windowdata->egl_surface == EGL_NO_SURFACE) {
123        return SDL_SetError("Could not create GLES window surface");
124    }
125
126    return WIN_GLES_MakeCurrent(_this, current_win, current_ctx);    
127}
128
129#endif /* SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL */
130
131/* vi: set ts=4 sw=4 expandtab: */
132
[FILE END]
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