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// Copyright 2018 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <GLES2/gl2.h>
#include <math.h>
#include <assert.h>
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
#include <emscripten/threading.h>
#include <bits/errno.h>
#include <stdlib.h>
pthread_t thread;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx;
_Atomic int threadRunning = 0;
void *ThreadMain(void *arg)
{
printf("Thread started. You should see the WebGL canvas fade from black to red.\n");
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
attr.explicitSwapControl = true;
ctx = emscripten_webgl_create_context("#canvas", &attr);
emscripten_webgl_make_context_current(ctx);
double color = 0;
for(int i = 0; i < 100; ++i)
{
color += 0.01;
glClearColor(color, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
EMSCRIPTEN_RESULT r = emscripten_webgl_commit_frame();
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
double now = emscripten_get_now();
while(emscripten_get_now() - now < 16) /*no-op*/;
}
#if 0 // TODO: this doesn't work yet for some reason
unsigned char data[64];
glReadPixels(0, 0, 4, 4, GL_RGBA, GL_UNSIGNED_BYTE, data);
assert(glGetError() == 0);
printf("%d %d %d %d\n", data[0], data[1], data[2], data[3]);
#endif
emscripten_webgl_make_context_current(0);
emscripten_webgl_destroy_context(ctx);
threadRunning = 0;
printf("Thread quit\n");
pthread_exit(0);
}
void CreateThread()
{
pthread_attr_t attr;
pthread_attr_init(&attr);
emscripten_pthread_attr_settransferredcanvases(&attr, "#canvas");
int rc = pthread_create(&thread, &attr, ThreadMain, 0);
if (rc == ENOSYS)
{
printf("Test Skipped! OffscreenCanvas is not supported!\n");
#ifdef REPORT_RESULT
REPORT_RESULT(0); // for now, report a skip as success
#endif
exit(1);
}
pthread_attr_destroy(&attr);
threadRunning = 1;
}
void PollThreadExit(void *arg)
{
if (!threadRunning)
{
printf("Test finished.\n");
#ifdef REPORT_RESULT
REPORT_RESULT(0);
#endif
} else {
emscripten_async_call(PollThreadExit, 0, 100);
}
}
int main()
{
if (!emscripten_supports_offscreencanvas())
{
printf("Current browser does not support OffscreenCanvas. Skipping this test.\n");
#ifdef REPORT_RESULT
REPORT_RESULT(0);
#endif
return 0;
}
CreateThread();
emscripten_async_call(PollThreadExit, 0, 100);
return 0;
}
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