SDL  2.0
SDL_offscreenopengl.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2020 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 
22 #include "../../SDL_internal.h"
23 
24 #if SDL_VIDEO_DRIVER_OFFSCREEN
25 
26 #include "SDL_offscreenopengl.h"
27 
28 #include "SDL_opengl.h"
29 
30 int
32 {
33  OFFSCREEN_Window* offscreen_wind = window->driverdata;
34 
35  SDL_EGL_SwapBuffers(_this, offscreen_wind->egl_surface);
36  return 0;
37 }
38 
39 int
41 {
42  if (window) {
43  EGLSurface egl_surface = ((OFFSCREEN_Window*)window->driverdata)->egl_surface;
44  return SDL_EGL_MakeCurrent(_this, egl_surface, context);
45  }
46 
47  return SDL_EGL_MakeCurrent(_this, NULL, NULL);
48 }
49 
52 {
53  OFFSCREEN_Window* offscreen_window = window->driverdata;
54 
56  context = SDL_EGL_CreateContext(_this, offscreen_window->egl_surface);
57 
58  return context;
59 }
60 
61 int
63 {
64  int ret = SDL_EGL_LoadLibraryOnly(_this, path);
65  if (ret != 0) {
66  return ret;
67  }
68 
69  ret = SDL_EGL_InitializeOffscreen(_this, 0);
70  if (ret != 0) {
71  return ret;
72  }
73 
74  ret = SDL_EGL_ChooseConfig(_this);
75  if (ret != 0) {
76  return ret;
77  }
78 
79  return 0;
80 }
81 
82 void
84 {
85  SDL_EGL_UnloadLibrary(_this);
86 }
87 
88 void*
89 OFFSCREEN_GL_GetProcAddress(_THIS, const char* proc)
90 {
91  void* proc_addr = SDL_EGL_GetProcAddress(_this, proc);
92 
93  if (!proc_addr) {
94  SDL_SetError("Failed to find proc address!");
95  }
96 
97  return proc_addr;
98 }
99 
100 #endif /* SDL_VIDEO_DRIVER_OFFSCREEN */
101 
102 /* vi: set ts=4 sw=4 expandtab: */
OFFSCREEN_GL_LoadLibrary
int OFFSCREEN_GL_LoadLibrary(_THIS, const char *path)
NULL
#define NULL
Definition: begin_code.h:167
SDL_opengl.h
OFFSCREEN_GL_UnloadLibrary
void OFFSCREEN_GL_UnloadLibrary(_THIS)
path
GLsizei const GLchar *const * path
Definition: SDL_opengl_glext.h:3733
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:74
context
static screen_context_t context
Definition: video.c:25
_this
static SDL_VideoDevice * _this
Definition: SDL_video.c:121
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
OFFSCREEN_Window
Definition: SDL_offscreenwindow.h:30
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
OFFSCREEN_GL_CreateContext
SDL_GLContext OFFSCREEN_GL_CreateContext(_THIS, SDL_Window *window)
SDL_GLContext
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:192
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
SDL_offscreenopengl.h
OFFSCREEN_Window::egl_surface
EGLSurface egl_surface
Definition: SDL_offscreenwindow.h:32
OFFSCREEN_GL_MakeCurrent
int OFFSCREEN_GL_MakeCurrent(_THIS, SDL_Window *window, SDL_GLContext context)
EGLSurface
void * EGLSurface
Definition: egl.h:59
OFFSCREEN_GL_SwapWindow
int OFFSCREEN_GL_SwapWindow(_THIS, SDL_Window *window)
OFFSCREEN_GL_GetProcAddress
void * OFFSCREEN_GL_GetProcAddress(_THIS, const char *proc)