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emscripten: Return an error for webgl context limitations

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This commit is contained in:
Charlie Birks 2022-02-26 12:24:32 +00:00
parent eebbf3457c
commit 539efc1bba
2 changed files with 31 additions and 1 deletions
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30
src/video/emscripten/SDL_emscriptenopengles.c
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@ -94,6 +94,12 @@ Emscripten_GLES_CreateContext(_THIS, SDL_Window * window)
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) {
@ -106,6 +112,7 @@ Emscripten_GLES_CreateContext(_THIS, SDL_Window * window)
return NULL;
}
window_data->gl_context = (SDL_GLContext)context;
return (SDL_GLContext)context;
}
@ -113,6 +120,18 @@ Emscripten_GLES_CreateContext(_THIS, SDL_Window * window)
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);
}
@ -129,7 +148,16 @@ Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window)
int
Emscripten_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
{
/* ignores window, as it isn't possible to reuse contexts across canvases */
/* 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");
}

2
src/video/emscripten/SDL_emscriptenvideo.h
View file

@ -33,6 +33,8 @@ typedef struct SDL_WindowData
SDL_Window *window;
SDL_Surface *surface;
SDL_GLContext gl_context;
char *canvas_id;
float pixel_ratio;