From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Sat, 27 Dec 2025 12:03:39 -0800 Subject: Initial commit --- .../src/video/emscripten/SDL_emscriptenopengles.c | 162 +++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/video/emscripten/SDL_emscriptenopengles.c (limited to 'contrib/SDL-3.2.8/src/video/emscripten/SDL_emscriptenopengles.c') diff --git a/contrib/SDL-3.2.8/src/video/emscripten/SDL_emscriptenopengles.c b/contrib/SDL-3.2.8/src/video/emscripten/SDL_emscriptenopengles.c new file mode 100644 index 0000000..227cdc5 --- /dev/null +++ b/contrib/SDL-3.2.8/src/video/emscripten/SDL_emscriptenopengles.c @@ -0,0 +1,162 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2025 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ +#include "SDL_internal.h" + +#ifdef SDL_VIDEO_DRIVER_EMSCRIPTEN + +#include +#include +#include + +#include "SDL_emscriptenvideo.h" +#include "SDL_emscriptenopengles.h" + +bool Emscripten_GLES_LoadLibrary(SDL_VideoDevice *_this, const char *path) +{ + return true; +} + +void Emscripten_GLES_UnloadLibrary(SDL_VideoDevice *_this) +{ +} + +SDL_FunctionPointer Emscripten_GLES_GetProcAddress(SDL_VideoDevice *_this, const char *proc) +{ + return emscripten_webgl_get_proc_address(proc); +} + +bool Emscripten_GLES_SetSwapInterval(SDL_VideoDevice *_this, int interval) +{ + if (interval < 0) { + return SDL_SetError("Late swap tearing currently unsupported"); + } + + if (Emscripten_ShouldSetSwapInterval(interval)) { + if (interval == 0) { + emscripten_set_main_loop_timing(EM_TIMING_SETTIMEOUT, 0); + } else { + emscripten_set_main_loop_timing(EM_TIMING_RAF, interval); + } + } + + return true; +} + +bool Emscripten_GLES_GetSwapInterval(SDL_VideoDevice *_this, int *interval) +{ + int mode, value; + + emscripten_get_main_loop_timing(&mode, &value); + + if (mode == EM_TIMING_RAF) { + *interval = value; + return true; + } else { + *interval = 0; + return true; + } +} + +SDL_GLContext Emscripten_GLES_CreateContext(SDL_VideoDevice *_this, SDL_Window *window) +{ + SDL_WindowData *window_data; + + EmscriptenWebGLContextAttributes attribs; + EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context; + + emscripten_webgl_init_context_attributes(&attribs); + + attribs.alpha = _this->gl_config.alpha_size > 0; + attribs.depth = _this->gl_config.depth_size > 0; + attribs.stencil = _this->gl_config.stencil_size > 0; + attribs.antialias = _this->gl_config.multisamplebuffers == 1; + + if (_this->gl_config.major_version == 3) + attribs.majorVersion = 2; // WebGL 2.0 ~= GLES 3.0 + + window_data = window->internal; + + if (window_data->gl_context) { + SDL_SetError("Cannot create multiple webgl contexts per window"); + return NULL; + } + + context = emscripten_webgl_create_context(window_data->canvas_id, &attribs); + + if (context < 0) { + SDL_SetError("Could not create webgl context"); + return NULL; + } + + if (emscripten_webgl_make_context_current(context) != EMSCRIPTEN_RESULT_SUCCESS) { + emscripten_webgl_destroy_context(context); + return NULL; + } + + window_data->gl_context = (SDL_GLContext)context; + + return (SDL_GLContext)context; +} + +bool Emscripten_GLES_DestroyContext(SDL_VideoDevice *_this, SDL_GLContext context) +{ + SDL_Window *window; + + // remove the context from its window + for (window = _this->windows; window; window = window->next) { + SDL_WindowData *window_data = window->internal; + + if (window_data->gl_context == context) { + window_data->gl_context = NULL; + } + } + + emscripten_webgl_destroy_context((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)context); + return true; +} + +bool Emscripten_GLES_SwapWindow(SDL_VideoDevice *_this, SDL_Window *window) +{ + if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, true)) { + // give back control to browser for screen refresh + emscripten_sleep(0); + } + return true; +} + +bool Emscripten_GLES_MakeCurrent(SDL_VideoDevice *_this, SDL_Window *window, SDL_GLContext context) +{ + // it isn't possible to reuse contexts across canvases + if (window && context) { + SDL_WindowData *window_data = window->internal; + + if (context != window_data->gl_context) { + return SDL_SetError("Cannot make context current to another window"); + } + } + + if (emscripten_webgl_make_context_current((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)context) != EMSCRIPTEN_RESULT_SUCCESS) { + return SDL_SetError("Unable to make context current"); + } + return true; +} + +#endif // SDL_VIDEO_DRIVER_EMSCRIPTEN -- cgit v1.2.3