299 lines
8.9 KiB
C
299 lines
8.9 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2017 - Daniel De Matteis
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* Copyright (C) 2012-2015 - Michael Lelli
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <emscripten/emscripten.h>
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#include <emscripten/html5.h>
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#ifdef HAVE_CONFIG_H
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#include "../../config.h"
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#endif
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#include "../../retroarch.h"
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#include "../../verbosity.h"
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typedef struct
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{
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EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx;
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unsigned fb_width;
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unsigned fb_height;
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} emscripten_ctx_data_t;
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static void gfx_ctx_emscripten_webgl_swap_interval(void *data, int interval)
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{
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if (interval == 0)
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emscripten_set_main_loop_timing(EM_TIMING_SETIMMEDIATE, 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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static void gfx_ctx_emscripten_webgl_get_canvas_size(int *width, int *height)
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{
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EmscriptenFullscreenChangeEvent fullscreen_status;
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bool is_fullscreen = false;
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EMSCRIPTEN_RESULT r = emscripten_get_fullscreen_status(&fullscreen_status);
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if (r == EMSCRIPTEN_RESULT_SUCCESS)
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{
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if (fullscreen_status.isFullscreen)
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{
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is_fullscreen = true;
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*width = fullscreen_status.screenWidth;
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*height = fullscreen_status.screenHeight;
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}
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}
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if (!is_fullscreen)
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{
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double w, h;
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r = emscripten_get_element_css_size("#canvas", &w, &h);
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*width = (int)w;
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*height = (int)h;
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if (r != EMSCRIPTEN_RESULT_SUCCESS)
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{
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*width = 800;
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*height = 600;
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RARCH_ERR("[EMSCRIPTEN/WebGL]: Could not get screen dimensions: %d\n",r);
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}
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}
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}
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static void gfx_ctx_emscripten_webgl_check_window(void *data, bool *quit,
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bool *resize, unsigned *width, unsigned *height)
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{
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int input_width=0;
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int input_height=0;
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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gfx_ctx_emscripten_webgl_get_canvas_size(&input_width, &input_height);
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*width = (unsigned)input_width;
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*height = (unsigned)input_height;
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*resize = (*width != emscripten->fb_width || *height != emscripten->fb_height);
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emscripten->fb_width = *width;
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emscripten->fb_height = *height;
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*quit = false;
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}
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static void gfx_ctx_emscripten_webgl_swap_buffers(void *data)
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{
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#ifdef USE_OFFSCREENCANVAS
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emscripten_webgl_commit_frame();
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#endif
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}
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static void gfx_ctx_emscripten_webgl_get_video_size(void *data,
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unsigned *width, unsigned *height)
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{
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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int s_width, s_height;
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if (!emscripten)
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return;
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gfx_ctx_emscripten_webgl_get_canvas_size(&s_width, &s_height);
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*width = (unsigned)s_width;
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*height = (unsigned)s_height;
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}
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static void gfx_ctx_emscripten_webgl_destroy(void *data)
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{
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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if (!emscripten)
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return;
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emscripten_webgl_destroy_context(emscripten->ctx);
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free(data);
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}
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static void *gfx_ctx_emscripten_webgl_init(void *video_driver)
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{
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int width, height;
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)
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calloc(1, sizeof(*emscripten));
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EmscriptenWebGLContextAttributes attrs={0};
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emscripten_webgl_init_context_attributes(&attrs);
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attrs.alpha = false;
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attrs.depth = true;
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attrs.stencil = true;
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attrs.antialias = false;
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attrs.powerPreference = EM_WEBGL_POWER_PREFERENCE_HIGH_PERFORMANCE;
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attrs.majorVersion = 2;
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attrs.minorVersion = 0;
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attrs.enableExtensionsByDefault = true;
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#ifdef USE_OFFSCREENCANVAS
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attrs.explicitSwapControl = true;
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#else
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attrs.explicitSwapControl = false;
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#endif
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attrs.renderViaOffscreenBackBuffer = false;
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attrs.proxyContextToMainThread = EMSCRIPTEN_WEBGL_CONTEXT_PROXY_DISALLOW;
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if (!emscripten)
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return NULL;
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emscripten->ctx = emscripten_webgl_create_context("#canvas", &attrs);
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if(!emscripten->ctx) {
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RARCH_ERR("[EMSCRIPTEN/WEBGL]: Failed to initialize webgl\n");
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goto error;
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}
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emscripten_webgl_get_drawing_buffer_size(emscripten->ctx, &width, &height);
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emscripten_webgl_make_context_current(emscripten->ctx);
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emscripten->fb_width = (unsigned)width;
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emscripten->fb_height = (unsigned)height;
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return emscripten;
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error:
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gfx_ctx_emscripten_webgl_destroy(video_driver);
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return NULL;
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}
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static bool gfx_ctx_emscripten_webgl_set_video_mode(void *data,
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unsigned width, unsigned height,
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bool fullscreen)
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{
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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EMSCRIPTEN_RESULT r;
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if(!emscripten || !emscripten->ctx) return false;
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if (width != 0 && height != 0) {
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r = emscripten_set_canvas_element_size("#canvas",
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(int)width, (int)height);
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if (r != EMSCRIPTEN_RESULT_SUCCESS) {
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RARCH_ERR("[EMSCRIPTEN/WebGL]: error resizing canvas: %d\n", r);
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return false;
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}
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}
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emscripten->fb_width = width;
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emscripten->fb_height = height;
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return true;
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}
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bool gfx_ctx_emscripten_webgl_set_resize(void *data, unsigned width, unsigned height) {
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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EMSCRIPTEN_RESULT r;
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if(!emscripten || !emscripten->ctx) return false;
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r = emscripten_set_canvas_element_size("#canvas",
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(int)width, (int)height);
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if (r != EMSCRIPTEN_RESULT_SUCCESS) {
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RARCH_ERR("[EMSCRIPTEN/WebGL]: error resizing canvas: %d\n", r);
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return false;
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}
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return true;
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}
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static enum gfx_ctx_api gfx_ctx_emscripten_webgl_get_api(void *data) { return GFX_CTX_OPENGL_ES_API; }
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static bool gfx_ctx_emscripten_webgl_bind_api(void *data,
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enum gfx_ctx_api api, unsigned major, unsigned minor)
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{
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return true;
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}
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static void gfx_ctx_emscripten_webgl_input_driver(void *data,
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const char *name,
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input_driver_t **input, void **input_data)
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{
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void *rwebinput = input_driver_init_wrap(&input_rwebinput, name);
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*input = rwebinput ? &input_rwebinput : NULL;
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*input_data = rwebinput;
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}
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static bool gfx_ctx_emscripten_webgl_get_metrics(void *data,
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enum display_metric_types type, float *value)
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{
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switch (type)
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{
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// there is no way to get the actual DPI in emscripten, so return a standard value instead.
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// this is needed for menu touch/pointer swipe scrolling to work.
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case DISPLAY_METRIC_DPI:
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*value = 150.0f;
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break;
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default:
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*value = 0.0f;
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return false;
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}
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return true;
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}
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static bool gfx_ctx_emscripten_webgl_has_focus(void *data) {
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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return emscripten && emscripten->ctx;
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}
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static bool gfx_ctx_emscripten_webgl_suppress_screensaver(void *data, bool enable) { return false; }
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static float gfx_ctx_emscripten_webgl_translate_aspect(void *data,
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unsigned width, unsigned height) { return (float)width / height; }
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static void gfx_ctx_emscripten_webgl_bind_hw_render(void *data, bool enable)
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{
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emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
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emscripten_webgl_make_context_current(emscripten->ctx);
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}
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static uint32_t gfx_ctx_emscripten_webgl_get_flags(void *data)
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{
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uint32_t flags = 0;
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BIT32_SET(flags, GFX_CTX_FLAGS_SHADERS_GLSL);
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return flags;
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}
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static void gfx_ctx_emscripten_webgl_set_flags(void *data, uint32_t flags) { }
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const gfx_ctx_driver_t gfx_ctx_emscripten_webgl = {
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gfx_ctx_emscripten_webgl_init,
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gfx_ctx_emscripten_webgl_destroy,
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gfx_ctx_emscripten_webgl_get_api,
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gfx_ctx_emscripten_webgl_bind_api,
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gfx_ctx_emscripten_webgl_swap_interval,
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gfx_ctx_emscripten_webgl_set_video_mode,
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gfx_ctx_emscripten_webgl_get_video_size,
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NULL, /* get_refresh_rate */
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NULL, /* get_video_output_size */
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NULL, /* get_video_output_prev */
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NULL, /* get_video_output_next */
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gfx_ctx_emscripten_webgl_get_metrics,
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gfx_ctx_emscripten_webgl_translate_aspect,
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NULL, /* update_title */
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gfx_ctx_emscripten_webgl_check_window,
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gfx_ctx_emscripten_webgl_set_resize, /* set_resize */
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gfx_ctx_emscripten_webgl_has_focus,
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gfx_ctx_emscripten_webgl_suppress_screensaver,
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false,
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gfx_ctx_emscripten_webgl_swap_buffers,
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gfx_ctx_emscripten_webgl_input_driver,
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NULL,
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NULL,
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NULL,
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NULL,
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"webgl_emscripten",
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gfx_ctx_emscripten_webgl_get_flags,
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gfx_ctx_emscripten_webgl_set_flags,
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gfx_ctx_emscripten_webgl_bind_hw_render,
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NULL, /* get_context_data */
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NULL /* make_current */
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};
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