SDL  2.0
SDL_windowsopengles.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2019 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 #include "SDL_log.h"
29 
30 /* EGL implementation of SDL OpenGL support */
31 
32 int
33 WIN_GLES_LoadLibrary(_THIS, const char *path) {
34 
35  /* If the profile requested is not GL ES, switch over to WIN_GL functions */
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 
62 WIN_GLES_CreateContext(_THIS, SDL_Window * window)
63 {
65  SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
66 
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 
93 void
94 WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
95 {
96  SDL_EGL_DeleteContext(_this, context);
97  WIN_GLES_UnloadLibrary(_this);
98 }
99 
100 SDL_EGL_SwapWindow_impl(WIN)
101 SDL_EGL_MakeCurrent_impl(WIN)
102 
103 int
104 WIN_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: */
NULL
#define NULL
Definition: begin_code.h:167
SDL_windowsopengles.h
EGL_DEFAULT_DISPLAY
#define EGL_DEFAULT_DISPLAY
Definition: egl.h:227
NativeWindowType
EGLNativeWindowType NativeWindowType
Definition: eglplatform.h:112
SDL_log.h
SDL_WindowData
Definition: SDL_androidwindow.h:38
SDL_windowsopengl.h
SDL_VideoDevice::profile_mask
int profile_mask
Definition: SDL_sysvideo.h:346
path
GLsizei const GLchar *const * path
Definition: SDL_opengl_glext.h:3730
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
context
static screen_context_t context
Definition: video.c:25
_this
static SDL_VideoDevice * _this
Definition: SDL_video.c:118
SDL_windowsvideo.h
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
EGL_NO_SURFACE
#define EGL_NO_SURFACE
Definition: egl.h:100
SDL_GL_CONTEXT_PROFILE_ES
@ SDL_GL_CONTEXT_PROFILE_ES
Definition: SDL_video.h:233
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
SDL_GL_GetCurrentContext
#define SDL_GL_GetCurrentContext
Definition: SDL_dynapi_overrides.h:562
SDL_VideoDevice::GL_SetSwapInterval
int(* GL_SetSwapInterval)(_THIS, int interval)
Definition: SDL_sysvideo.h:261
SDL_GLContext
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:193
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
SDL_VideoDevice::GL_MakeCurrent
int(* GL_MakeCurrent)(_THIS, SDL_Window *window, SDL_GLContext context)
Definition: SDL_sysvideo.h:259
SDL_VideoDevice::GL_LoadLibrary
int(* GL_LoadLibrary)(_THIS, const char *path)
Definition: SDL_sysvideo.h:255
SDL_GL_GetCurrentWindow
#define SDL_GL_GetCurrentWindow
Definition: SDL_dynapi_overrides.h:561
SDL_VideoDevice::GL_UnloadLibrary
void(* GL_UnloadLibrary)(_THIS)
Definition: SDL_sysvideo.h:257
SDL_VideoDevice::GL_CreateContext
SDL_GLContext(* GL_CreateContext)(_THIS, SDL_Window *window)
Definition: SDL_sysvideo.h:258
SDL_VideoDevice::GL_GetSwapInterval
int(* GL_GetSwapInterval)(_THIS)
Definition: SDL_sysvideo.h:262
SDL_VideoDevice::GL_SwapWindow
int(* GL_SwapWindow)(_THIS, SDL_Window *window)
Definition: SDL_sysvideo.h:263
SDL_VIDEO_OPENGL_WGL
#define SDL_VIDEO_OPENGL_WGL
Definition: SDL_config_windows.h:228
SDL_WindowData::hwnd
HWND hwnd
Definition: SDL_windowswindow.h:33
SDL_VideoDevice::GL_GetProcAddress
void *(* GL_GetProcAddress)(_THIS, const char *proc)
Definition: SDL_sysvideo.h:256
SDL_WindowData::egl_surface
EGLSurface egl_surface
Definition: SDL_androidwindow.h:40
SDL_VideoDevice::GL_DeleteContext
void(* GL_DeleteContext)(_THIS, SDL_GLContext context)
Definition: SDL_sysvideo.h:264
SDL_VideoDevice::gl_config
struct SDL_VideoDevice::@261 gl_config