SDL  2.0
SDL_emscriptenopengles.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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  /* Emscripten forces you to manually cast eglGetProcAddress to the real
44  function type; grep for "__eglMustCastToProperFunctionPointerType" in
45  Emscripten's egl.h for details. */
46  _this->egl_data->eglGetProcAddress = (void *(EGLAPIENTRY *)(const char *)) eglGetProcAddress;
47 
48  LOAD_FUNC(eglGetDisplay);
49  LOAD_FUNC(eglInitialize);
50  LOAD_FUNC(eglTerminate);
51  LOAD_FUNC(eglChooseConfig);
52  LOAD_FUNC(eglGetConfigAttrib);
53  LOAD_FUNC(eglCreateContext);
54  LOAD_FUNC(eglDestroyContext);
55  LOAD_FUNC(eglCreateWindowSurface);
56  LOAD_FUNC(eglDestroySurface);
57  LOAD_FUNC(eglMakeCurrent);
58  LOAD_FUNC(eglSwapBuffers);
59  LOAD_FUNC(eglSwapInterval);
60  LOAD_FUNC(eglWaitNative);
61  LOAD_FUNC(eglWaitGL);
62  LOAD_FUNC(eglBindAPI);
63 
64  _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
65  if (!_this->egl_data->egl_display) {
66  return SDL_SetError("Could not get EGL display");
67  }
68 
69  if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
70  return SDL_SetError("Could not initialize EGL");
71  }
72 
73  if (path) {
75  } else {
76  *_this->gl_config.driver_path = '\0';
77  }
78 
79  return 0;
80 }
81 
82 void
83 Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
84 {
85  /*
86  WebGL contexts can't actually be deleted, so we need to reset it.
87  ES2 renderer resets state on init anyway, clearing the canvas should be enough
88  */
89 
91 
92  SDL_EGL_DeleteContext(_this, context);
93 }
94 
95 SDL_EGL_CreateContext_impl(Emscripten)
96 SDL_EGL_SwapWindow_impl(Emscripten)
97 SDL_EGL_MakeCurrent_impl(Emscripten)
98 
99 void
100 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
101 {
103  if (window->driverdata) {
104  data = (SDL_WindowData *) window->driverdata;
105 
106  if (w) {
107  *w = window->w * data->pixel_ratio;
108  }
109 
110  if (h) {
111  *h = window->h * data->pixel_ratio;
112  }
113  }
114 }
115 
116 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
117 
118 /* vi: set ts=4 sw=4 expandtab: */
119 
#define SDL_strlcpy
EGLAPI EGLBoolean EGLAPIENTRY eglTerminate(EGLDisplay dpy)
EGLAPI EGLBoolean EGLAPIENTRY eglDestroySurface(EGLDisplay dpy, EGLSurface surface)
EGLAPI EGLSurface EGLAPIENTRY eglCreateWindowSurface(EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint *attrib_list)
#define GL_STENCIL_BUFFER_BIT
Definition: SDL_opengl.h:738
EGLAPI EGLBoolean EGLAPIENTRY eglMakeCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx)
GLfloat GLfloat GLfloat GLfloat h
static screen_context_t context
Definition: video.c:25
#define GL_DEPTH_BUFFER_BIT
Definition: SDL_opengl.h:736
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
EGLAPI __eglMustCastToProperFunctionPointerType EGLAPIENTRY eglGetProcAddress(const char *procname)
EGLAPI EGLBoolean EGLAPIENTRY eglGetConfigAttrib(EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value)
EGLAPI EGLBoolean EGLAPIENTRY eglBindAPI(EGLenum api)
#define EGL_TRUE
Definition: egl.h:116
#define EGL_DEFAULT_DISPLAY
Definition: egl.h:227
EGLAPI EGLBoolean EGLAPIENTRY eglChooseConfig(EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config)
static SDL_VideoDevice * _this
Definition: SDL_video.c:121
EGLAPI EGLBoolean EGLAPIENTRY eglDestroyContext(EGLDisplay dpy, EGLContext ctx)
#define EGLAPIENTRY
Definition: eglplatform.h:54
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:175
#define _THIS
char driver_path[256]
Definition: SDL_sysvideo.h:350
GLubyte GLubyte GLubyte GLubyte w
GLAPI void GLAPIENTRY glClear(GLbitfield mask)
#define GL_COLOR_BUFFER_BIT
Definition: SDL_opengl.h:742
#define NULL
Definition: begin_code.h:164
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
EGLAPI EGLDisplay EGLAPIENTRY eglGetDisplay(EGLNativeDisplayType display_id)
#define SDL_SetError
EGLAPI EGLBoolean EGLAPIENTRY eglSwapBuffers(EGLDisplay dpy, EGLSurface surface)
#define SDL_calloc
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
The type used to identify a window.
Definition: SDL_sysvideo.h:73
EGLAPI EGLBoolean EGLAPIENTRY eglWaitGL(void)
EGLAPI EGLBoolean EGLAPIENTRY eglSwapInterval(EGLDisplay dpy, EGLint interval)
EGLAPI EGLBoolean EGLAPIENTRY eglWaitNative(EGLint engine)
GLsizei const GLchar *const * path
struct SDL_VideoDevice::@34 gl_config
void * driverdata
Definition: SDL_sysvideo.h:111
EGLAPI EGLContext EGLAPIENTRY eglCreateContext(EGLDisplay dpy, EGLConfig config, EGLContext share_context, const EGLint *attrib_list)
EGLAPI EGLBoolean EGLAPIENTRY eglInitialize(EGLDisplay dpy, EGLint *major, EGLint *minor)