SDL  2.0
SDL_emscriptenopengles.c
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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_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL
24 
25 #include <emscripten/emscripten.h>
26 #include <GLES2/gl2.h>
27 
28 #include "SDL_emscriptenvideo.h"
29 #include "SDL_emscriptenopengles.h"
30 
31 #define LOAD_FUNC(NAME) _this->egl_data->NAME = NAME;
32 
33 /* EGL implementation of SDL OpenGL support */
34 
35 int
36 Emscripten_GLES_LoadLibrary(_THIS, const char *path) {
37  /*we can't load EGL dynamically*/
38  _this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
39  if (!_this->egl_data) {
40  return SDL_OutOfMemory();
41  }
42 
43  LOAD_FUNC(eglGetDisplay);
44  LOAD_FUNC(eglInitialize);
45  LOAD_FUNC(eglTerminate);
46  LOAD_FUNC(eglGetProcAddress);
47  LOAD_FUNC(eglChooseConfig);
48  LOAD_FUNC(eglGetConfigAttrib);
49  LOAD_FUNC(eglCreateContext);
50  LOAD_FUNC(eglDestroyContext);
51  LOAD_FUNC(eglCreateWindowSurface);
52  LOAD_FUNC(eglDestroySurface);
53  LOAD_FUNC(eglMakeCurrent);
54  LOAD_FUNC(eglSwapBuffers);
55  LOAD_FUNC(eglSwapInterval);
56  LOAD_FUNC(eglWaitNative);
57  LOAD_FUNC(eglWaitGL);
58  LOAD_FUNC(eglBindAPI);
59 
60  _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
61  if (!_this->egl_data->egl_display) {
62  return SDL_SetError("Could not get EGL display");
63  }
64 
65  if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
66  return SDL_SetError("Could not initialize EGL");
67  }
68 
70 
71  if (path) {
73  } else {
74  *_this->gl_config.driver_path = '\0';
75  }
76 
77  return 0;
78 }
79 
80 void
81 Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
82 {
83  /*
84  WebGL contexts can't actually be deleted, so we need to reset it.
85  ES2 renderer resets state on init anyway, clearing the canvas should be enough
86  */
87 
89 
90  SDL_EGL_DeleteContext(_this, context);
91 }
92 
93 SDL_EGL_CreateContext_impl(Emscripten)
94 SDL_EGL_SwapWindow_impl(Emscripten)
95 SDL_EGL_MakeCurrent_impl(Emscripten)
96 
97 void
98 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
99 {
101  if (window->driverdata) {
102  data = (SDL_WindowData *) window->driverdata;
103 
104  if (w) {
105  *w = window->w * data->pixel_ratio;
106  }
107 
108  if (h) {
109  *h = window->h * data->pixel_ratio;
110  }
111  }
112 }
113 
114 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
115 
116 /* vi: set ts=4 sw=4 expandtab: */
117 
#define SDL_strlcpy
#define GL_STENCIL_BUFFER_BIT
Definition: SDL_opengl.h:731
SDL_Window * window
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1967
#define GL_DEPTH_BUFFER_BIT
Definition: SDL_opengl.h:729
static SDL_VideoDevice * _this
Definition: SDL_video.c:114
void * SDL_calloc(size_t nmemb, size_t size)
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:164
#define _THIS
char driver_path[256]
Definition: SDL_sysvideo.h:316
GLAPI void GLAPIENTRY glClear(GLbitfield mask)
#define GL_COLOR_BUFFER_BIT
Definition: SDL_opengl.h:735
struct SDL_VideoDevice::@27 gl_config
#define NULL
Definition: begin_code.h:143
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SDL_SetError
The type used to identify a window.
Definition: SDL_sysvideo.h:71
GLsizei const GLchar *const * path
GLubyte GLubyte GLubyte GLubyte w
GLfloat GLfloat GLfloat GLfloat h