mirror of https://github.com/libsdl-org/SDL.git
143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_VIDEO_DRIVER_EMSCRIPTEN
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#include <emscripten/emscripten.h>
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#include <emscripten/html5_webgl.h>
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#include <GLES2/gl2.h>
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#include "SDL_emscriptenvideo.h"
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#include "SDL_emscriptenopengles.h"
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#include "SDL_hints.h"
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int
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Emscripten_GLES_LoadLibrary(_THIS, const char *path)
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{
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return 0;
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}
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void
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Emscripten_GLES_UnloadLibrary(_THIS)
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{
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}
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void *
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Emscripten_GLES_GetProcAddress(_THIS, const char *proc)
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{
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return emscripten_webgl_get_proc_address(proc);
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}
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int
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Emscripten_GLES_SetSwapInterval(_THIS, int interval)
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{
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if (interval < 0) {
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return SDL_SetError("Late swap tearing currently unsupported");
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} else if(interval == 0) {
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emscripten_set_main_loop_timing(EM_TIMING_SETTIMEOUT, 0);
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} else {
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emscripten_set_main_loop_timing(EM_TIMING_RAF, interval);
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}
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return 0;
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}
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int
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Emscripten_GLES_GetSwapInterval(_THIS)
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{
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int mode, value;
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emscripten_get_main_loop_timing(&mode, &value);
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if(mode == EM_TIMING_RAF)
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return value;
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return 0;
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}
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SDL_GLContext
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Emscripten_GLES_CreateContext(_THIS, SDL_Window * window)
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{
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SDL_WindowData *window_data;
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EmscriptenWebGLContextAttributes attribs;
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EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context;
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emscripten_webgl_init_context_attributes(&attribs);
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attribs.alpha = _this->gl_config.alpha_size > 0;
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attribs.depth = _this->gl_config.depth_size > 0;
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attribs.stencil = _this->gl_config.stencil_size > 0;
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attribs.antialias = _this->gl_config.multisamplebuffers == 1;
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if(_this->gl_config.major_version == 3)
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attribs.majorVersion = 2; /* WebGL 2.0 ~= GLES 3.0 */
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window_data = (SDL_WindowData *) window->driverdata;
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context = emscripten_webgl_create_context(window_data->canvas_id, &attribs);
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if (context < 0) {
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SDL_SetError("Could not create webgl context");
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return NULL;
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}
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if (emscripten_webgl_make_context_current(context) != EMSCRIPTEN_RESULT_SUCCESS) {
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emscripten_webgl_destroy_context(context);
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return NULL;
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}
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return (SDL_GLContext)context;
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}
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void
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Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
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{
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emscripten_webgl_destroy_context((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)context);
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}
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int
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Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window)
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{
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if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
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/* give back control to browser for screen refresh */
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emscripten_sleep(0);
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}
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return 0;
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}
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int
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Emscripten_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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/* ignores window, as it isn't possible to reuse contexts across canvases */
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if (emscripten_webgl_make_context_current((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)context) != EMSCRIPTEN_RESULT_SUCCESS) {
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return SDL_SetError("Unable to make context current");
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}
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return 0;
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}
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#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
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/* vi: set ts=4 sw=4 expandtab: */
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