Atlas - SDL_emscriptenopengles.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
35int
36Emscripten_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) {
74        SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
75    } else {
76        *_this->gl_config.driver_path = '\0';
77    }
78    
79    return 0;
80}
81
82void
83Emscripten_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
90    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
91
92    SDL_EGL_DeleteContext(_this, context);
93}
94
95SDL_EGL_CreateContext_impl(Emscripten)
96SDL_EGL_SwapWindow_impl(Emscripten)
97SDL_EGL_MakeCurrent_impl(Emscripten)
98
99void
100Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
101{
102    SDL_WindowData *data;
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
120
[FILE END]
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