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Merge pull request #6142 from Daft-Freak/em-webgl-selector-hint 

emscripten: use webgl APIs directly and add canvas selector hint
main
Ryan C. Gordon 2022-11-23 13:23:15 -05:00 committed by GitHub
parent a05b2fbeee c2f26087c8
commit a5e9d9bd7e
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 154 additions and 99 deletions
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9
include/SDL_hints.h
View File

@ -363,6 +363,15 @@ extern "C" {
*/
#define SDL_HINT_EMSCRIPTEN_ASYNCIFY "SDL_EMSCRIPTEN_ASYNCIFY"
/**
* \brief Specify the CSS selector used for the "default" window/canvas
*
* This hint only applies to the emscripten platform
*
* The default value is "#canvas"
*/
#define SDL_HINT_EMSCRIPTEN_CANVAS_SELECTOR "SDL_EMSCRIPTEN_CANVAS_SELECTOR"
/**
* \brief override the binding element for keyboard inputs for Emscripten builds
*

11
src/video/emscripten/SDL_emscriptenframebuffer.c
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@ -75,12 +75,15 @@ int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rec
var w = $0;
var h = $1;
var pixels = $2;
var canvasId = UTF8ToString($3);
var canvas = document.querySelector(canvasId);
//TODO: this should store a context per canvas
if (!Module['SDL3']) Module['SDL3'] = {};
var SDL3 = Module['SDL3'];
if (SDL3.ctxCanvas !== Module['canvas']) {
SDL3.ctx = Module['createContext'](Module['canvas'], false, true);
SDL3.ctxCanvas = Module['canvas'];
if (SDL3.ctxCanvas !== canvas) {
SDL3.ctx = Module['createContext'](canvas, false, true);
SDL3.ctxCanvas = canvas;
}
if (SDL3.w !== w || SDL3.h !== h || SDL3.imageCtx !== SDL3.ctx) {
SDL3.image = SDL3.ctx.createImageData(w, h);
@ -156,7 +159,7 @@ int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rec
}
SDL3.ctx.putImageData(SDL3.image, 0, 0);
}, surface->w, surface->h, surface->pixels);
}, surface->w, surface->h, surface->pixels, data->canvas_id);
if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
/* give back control to browser for screen refresh */

176
src/video/emscripten/SDL_emscriptenopengles.c
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@ -20,83 +20,151 @@
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL
#if SDL_VIDEO_DRIVER_EMSCRIPTEN
#include <emscripten/emscripten.h>
#include <emscripten/html5_webgl.h>
#include <GLES2/gl2.h>
#include "SDL_emscriptenvideo.h"
#include "SDL_emscriptenopengles.h"
#include "SDL_hints.h"
#define LOAD_FUNC(NAME) _this->egl_data->NAME = NAME;
/* EGL implementation of SDL OpenGL support */
int
Emscripten_GLES_LoadLibrary(_THIS, const char *path) {
/*we can't load EGL dynamically*/
_this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
if (!_this->egl_data) {
return SDL_OutOfMemory();
}
/* Emscripten forces you to manually cast eglGetProcAddress to the real
function type; grep for "__eglMustCastToProperFunctionPointerType" in
Emscripten's egl.h for details. */
_this->egl_data->eglGetProcAddress = (void *(EGLAPIENTRY *)(const char *)) eglGetProcAddress;
LOAD_FUNC(eglGetDisplay);
LOAD_FUNC(eglInitialize);
LOAD_FUNC(eglTerminate);
LOAD_FUNC(eglChooseConfig);
LOAD_FUNC(eglGetConfigAttrib);
LOAD_FUNC(eglCreateContext);
LOAD_FUNC(eglDestroyContext);
LOAD_FUNC(eglCreateWindowSurface);
LOAD_FUNC(eglDestroySurface);
LOAD_FUNC(eglMakeCurrent);
LOAD_FUNC(eglSwapBuffers);
LOAD_FUNC(eglSwapInterval);
LOAD_FUNC(eglWaitNative);
LOAD_FUNC(eglWaitGL);
LOAD_FUNC(eglBindAPI);
LOAD_FUNC(eglQueryString);
LOAD_FUNC(eglGetError);
_this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (!_this->egl_data->egl_display) {
return SDL_SetError("Could not get EGL display");
}
if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
return SDL_SetError("Could not initialize EGL");
}
if (path) {
SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
} else {
*_this->gl_config.driver_path = '\0';
}
Emscripten_GLES_LoadLibrary(_THIS, const char *path)
{
return 0;
}
SDL_EGL_CreateContext_impl(Emscripten)
SDL_EGL_MakeCurrent_impl(Emscripten)
void
Emscripten_GLES_UnloadLibrary(_THIS)
{
}
void *
Emscripten_GLES_GetProcAddress(_THIS, const char *proc)
{
return emscripten_webgl_get_proc_address(proc);
}
int
Emscripten_GLES_SetSwapInterval(_THIS, int interval)
{
if (interval < 0) {
return SDL_SetError("Late swap tearing currently unsupported");
} else if(interval == 0) {
emscripten_set_main_loop_timing(EM_TIMING_SETTIMEOUT, 0);
} else {
emscripten_set_main_loop_timing(EM_TIMING_RAF, interval);
}
return 0;
}
int
Emscripten_GLES_GetSwapInterval(_THIS)
{
int mode, value;
emscripten_get_main_loop_timing(&mode, &value);
if(mode == EM_TIMING_RAF)
return value;
return 0;
}
SDL_GLContext
Emscripten_GLES_CreateContext(_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 = (SDL_WindowData *) window->driverdata;
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;
}
void
Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
{
SDL_Window *window;
/* remove the context from its window */
for (window = _this->windows; window != NULL; window = window->next) {
SDL_WindowData *window_data;
window_data = (SDL_WindowData *) window->driverdata;
if (window_data->gl_context == context) {
window_data->gl_context = NULL;
}
}
emscripten_webgl_destroy_context((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)context);
}
int
Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window)
{
EGLBoolean ret = SDL_EGL_SwapBuffers(_this, ((SDL_WindowData *) window->driverdata)->egl_surface);
if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
/* give back control to browser for screen refresh */
emscripten_sleep(0);
}
return ret;
return 0;
}
#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
int
Emscripten_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
{
/* it isn't possible to reuse contexts across canvases */
if (window && context) {
SDL_WindowData *window_data;
window_data = (SDL_WindowData *) window->driverdata;
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 0;
}
#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
/* vi: set ts=4 sw=4 expandtab: */

16
src/video/emscripten/SDL_emscriptenopengles.h
View File

@ -23,25 +23,23 @@
#ifndef SDL_emscriptenopengles_h_
#define SDL_emscriptenopengles_h_
#if SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL
#if SDL_VIDEO_DRIVER_EMSCRIPTEN
#include "../SDL_sysvideo.h"
#include "../SDL_egl_c.h"
/* OpenGLES functions */
#define Emscripten_GLES_GetAttribute SDL_EGL_GetAttribute
#define Emscripten_GLES_GetProcAddress SDL_EGL_GetProcAddress
#define Emscripten_GLES_UnloadLibrary SDL_EGL_UnloadLibrary
#define Emscripten_GLES_SetSwapInterval SDL_EGL_SetSwapInterval
#define Emscripten_GLES_GetSwapInterval SDL_EGL_GetSwapInterval
#define Emscripten_GLES_DeleteContext SDL_EGL_DeleteContext
extern int Emscripten_GLES_LoadLibrary(_THIS, const char *path);
extern void Emscripten_GLES_UnloadLibrary(_THIS);
extern void * Emscripten_GLES_GetProcAddress(_THIS, const char *proc);
extern int Emscripten_GLES_SetSwapInterval(_THIS, int interval);
extern int Emscripten_GLES_GetSwapInterval(_THIS);
extern SDL_GLContext Emscripten_GLES_CreateContext(_THIS, SDL_Window * window);
extern void Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context);
extern int Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window);
extern int Emscripten_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context);
#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
#endif /* SDL_emscriptenopengles_h_ */

32
src/video/emscripten/SDL_emscriptenvideo.c
View File

@ -27,7 +27,6 @@
#include "SDL_hints.h"
#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../SDL_egl_c.h"
#include "../../events/SDL_events_c.h"
#include "SDL_emscriptenvideo.h"
@ -110,7 +109,6 @@ Emscripten_CreateDevice(void)
device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;
device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;
#if SDL_VIDEO_OPENGL_EGL
device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;
device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;
device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;
@ -120,7 +118,6 @@ Emscripten_CreateDevice(void)
device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;
device->GL_SwapWindow = Emscripten_GLES_SwapWindow;
device->GL_DeleteContext = Emscripten_GLES_DeleteContext;
#endif
device->free = Emscripten_DeleteDevice;
@ -218,6 +215,7 @@ Emscripten_CreateWindow(_THIS, SDL_Window * window)
SDL_WindowData *wdata;
double scaled_w, scaled_h;
double css_w, css_h;
const char *selector;
/* Allocate window internal data */
wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
@ -225,7 +223,12 @@ Emscripten_CreateWindow(_THIS, SDL_Window * window)
return SDL_OutOfMemory();
}
wdata->canvas_id = SDL_strdup("#canvas");
selector = SDL_GetHint(SDL_HINT_EMSCRIPTEN_CANVAS_SELECTOR);
if (!selector) {
selector = "#canvas";
}
wdata->canvas_id = SDL_strdup(selector);
if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
wdata->pixel_ratio = emscripten_get_device_pixel_ratio();
@ -259,21 +262,6 @@ Emscripten_CreateWindow(_THIS, SDL_Window * window)
}
}
#if SDL_VIDEO_OPENGL_EGL
if (window->flags & SDL_WINDOW_OPENGL) {
if (!_this->egl_data) {
if (SDL_GL_LoadLibrary(NULL) < 0) {
return -1;
}
}
wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);
if (wdata->egl_surface == EGL_NO_SURFACE) {
return SDL_SetError("Could not create GLES window surface");
}
}
#endif
wdata->window = window;
/* Setup driver data for this window */
@ -329,12 +317,6 @@ Emscripten_DestroyWindow(_THIS, SDL_Window * window)
data = (SDL_WindowData *) window->driverdata;
Emscripten_UnregisterEventHandlers(data);
#if SDL_VIDEO_OPENGL_EGL
if (data->egl_surface != EGL_NO_SURFACE) {
SDL_EGL_DestroySurface(_this, data->egl_surface);
data->egl_surface = EGL_NO_SURFACE;
}
#endif
/* We can't destroy the canvas, so resize it to zero instead */
emscripten_set_canvas_element_size(data->canvas_id, 0, 0);

9
src/video/emscripten/SDL_emscriptenvideo.h
View File

@ -28,18 +28,13 @@
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
#if SDL_VIDEO_OPENGL_EGL
#include <EGL/egl.h>
#endif
typedef struct SDL_WindowData
{
#if SDL_VIDEO_OPENGL_EGL
EGLSurface egl_surface;
#endif
SDL_Window *window;
SDL_Surface *surface;
SDL_GLContext gl_context;
char *canvas_id;
float pixel_ratio;