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  LOAD_FUNC(eglQueryString);
64  LOAD_FUNC(eglGetError);
65 
66  _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
67  if (!_this->egl_data->egl_display) {
68  return SDL_SetError("Could not get EGL display");
69  }
70 
71  if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
72  return SDL_SetError("Could not initialize EGL");
73  }
74 
75  if (path) {
77  } else {
78  *_this->gl_config.driver_path = '\0';
79  }
80 
81  return 0;
82 }
83 
84 void
85 Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
86 {
87  /*
88  WebGL contexts can't actually be deleted, so we need to reset it.
89  ES2 renderer resets state on init anyway, clearing the canvas should be enough
90  */
91 
93 
94  SDL_EGL_DeleteContext(_this, context);
95 }
96 
97 SDL_EGL_CreateContext_impl(Emscripten)
98 SDL_EGL_SwapWindow_impl(Emscripten)
99 SDL_EGL_MakeCurrent_impl(Emscripten)
100 
101 void
102 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
103 {
105  if (window->driverdata) {
106  data = (SDL_WindowData *) window->driverdata;
107 
108  if (w) {
109  *w = window->w * data->pixel_ratio;
110  }
111 
112  if (h) {
113  *h = window->h * data->pixel_ratio;
114  }
115  }
116 }
117 
118 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
119 
120 /* vi: set ts=4 sw=4 expandtab: */
121 
eglGetDisplay
EGLAPI EGLDisplay EGLAPIENTRY eglGetDisplay(EGLNativeDisplayType display_id)
SDL_strlcpy
#define SDL_strlcpy
Definition: SDL_dynapi_overrides.h:394
eglMakeCurrent
EGLAPI EGLBoolean EGLAPIENTRY eglMakeCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx)
eglSwapBuffers
EGLAPI EGLBoolean EGLAPIENTRY eglSwapBuffers(EGLDisplay dpy, EGLSurface surface)
eglInitialize
EGLAPI EGLBoolean EGLAPIENTRY eglInitialize(EGLDisplay dpy, EGLint *major, EGLint *minor)
NULL
#define NULL
Definition: begin_code.h:164
eglWaitNative
EGLAPI EGLBoolean EGLAPIENTRY eglWaitNative(EGLint engine)
eglQueryString
EGLAPI const char *EGLAPIENTRY eglQueryString(EGLDisplay dpy, EGLint name)
glClear
GLAPI void GLAPIENTRY glClear(GLbitfield mask)
EGL_DEFAULT_DISPLAY
#define EGL_DEFAULT_DISPLAY
Definition: egl.h:227
eglDestroySurface
EGLAPI EGLBoolean EGLAPIENTRY eglDestroySurface(EGLDisplay dpy, EGLSurface surface)
SDL_WindowData
Definition: SDL_androidwindow.h:36
SDL_VideoDevice::driver_path
char driver_path[256]
Definition: SDL_sysvideo.h:354
SDL_emscriptenopengles.h
GL_COLOR_BUFFER_BIT
#define GL_COLOR_BUFFER_BIT
Definition: SDL_opengl.h:742
SDL_emscriptenvideo.h
path
GLsizei const GLchar *const * path
Definition: SDL_opengl_glext.h:3730
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
EGL_TRUE
#define EGL_TRUE
Definition: egl.h:116
eglGetProcAddress
EGLAPI __eglMustCastToProperFunctionPointerType EGLAPIENTRY eglGetProcAddress(const char *procname)
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:74
eglBindAPI
EGLAPI EGLBoolean EGLAPIENTRY eglBindAPI(EGLenum api)
SDL_GLContext
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:193
GL_DEPTH_BUFFER_BIT
#define GL_DEPTH_BUFFER_BIT
Definition: SDL_opengl.h:736
context
static screen_context_t context
Definition: video.c:25
eglChooseConfig
EGLAPI EGLBoolean EGLAPIENTRY eglChooseConfig(EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config)
_this
static SDL_VideoDevice * _this
Definition: SDL_video.c:121
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
gl2.h
eglDestroyContext
EGLAPI EGLBoolean EGLAPIENTRY eglDestroyContext(EGLDisplay dpy, EGLContext ctx)
eglCreateContext
EGLAPI EGLContext EGLAPIENTRY eglCreateContext(EGLDisplay dpy, EGLConfig config, EGLContext share_context, const EGLint *attrib_list)
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
eglGetError
EGLAPI EGLint EGLAPIENTRY eglGetError(void)
eglCreateWindowSurface
EGLAPI EGLSurface EGLAPIENTRY eglCreateWindowSurface(EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint *attrib_list)
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
eglSwapInterval
EGLAPI EGLBoolean EGLAPIENTRY eglSwapInterval(EGLDisplay dpy, EGLint interval)
SDL_calloc
#define SDL_calloc
Definition: SDL_dynapi_overrides.h:375
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
EGLAPIENTRY
#define EGLAPIENTRY
Definition: eglplatform.h:54
eglTerminate
EGLAPI EGLBoolean EGLAPIENTRY eglTerminate(EGLDisplay dpy)
eglWaitGL
EGLAPI EGLBoolean EGLAPIENTRY eglWaitGL(void)
SDL_VideoDevice::gl_config
struct SDL_VideoDevice::@33 gl_config
eglGetConfigAttrib
EGLAPI EGLBoolean EGLAPIENTRY eglGetConfigAttrib(EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value)
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731
GL_STENCIL_BUFFER_BIT
#define GL_STENCIL_BUFFER_BIT
Definition: SDL_opengl.h:738