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#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>
// Pass #define TEST_OFFSCREENCANVAS when testing against OffscreenCanvas support
void fill(int color)
{
switch(color)
{
case 1: glClearColor(1, 0, 0, 1); printf("On thread %ld: you should see a red canvas.\n", (long)pthread_self()); break;
case 2: glClearColor(0, 1, 0, 1); printf("On thread %ld: you should see a green canvas.\n", (long)pthread_self()); break;
case 3: glClearColor(0, 0, 1, 1); printf("On thread %ld: you should see a blue canvas.\n", (long)pthread_self()); break;
}
glClear(GL_COLOR_BUFFER_BIT);
EMSCRIPTEN_RESULT r = emscripten_webgl_commit_frame();
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
emscripten_thread_sleep(2000);
}
void *thread_main(void *param)
{
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
attr.explicitSwapControl = EM_TRUE;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context("#canvas", &attr);
assert(ctx);
EMSCRIPTEN_RESULT r = emscripten_webgl_make_context_current(ctx);
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
fill((int)(intptr_t)param);
r = emscripten_webgl_make_context_current(0);
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
pthread_exit(0);
}
void run_thread(int param)
{
pthread_attr_t attr;
pthread_attr_init(&attr);
emscripten_pthread_attr_settransferredcanvases(&attr, "#canvas");
pthread_t thread;
int rc = pthread_create(&thread, &attr, thread_main, (void*)param);
assert(rc == 0);
rc = pthread_join(thread, NULL);
assert(rc == 0);
}
int main()
{
#ifdef TEST_OFFSCREENCANVAS
if (!emscripten_supports_offscreencanvas())
{
printf("Current browser does not support OffscreenCanvas. Skipping this test.\n");
#ifdef REPORT_RESULT
REPORT_RESULT(1);
#endif
return 0;
}
#endif
// Create a context
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
attr.explicitSwapControl = EM_TRUE;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context("#canvas", &attr);
assert(ctx);
// Activate it
EMSCRIPTEN_RESULT r = emscripten_webgl_make_context_current(ctx);
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
// Draw
fill(3);
// Release context for the threads to capture the canvas
r = emscripten_webgl_make_context_current(0);
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
// TODO: Optionally, also delete the above context
// TODO: Test that threads share the context (main thread creates, pthread uses)
run_thread(1);
run_thread(2);
run_thread(3);
// Reactivate the context we got
r = emscripten_webgl_make_context_current(ctx);
assert(r == EMSCRIPTEN_RESULT_SUCCESS);
// And render with it again
fill(1);
#ifdef REPORT_RESULT
REPORT_RESULT(1);
#endif
}
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