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// Copyright 2015 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 <GLES3/gl3.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <emscripten.h>
#include <emscripten/html5.h>
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context;
int main()
{
EM_ASM({
Array.prototype.someExtensionFromThirdParty = {};
Array.prototype.someExtensionFromThirdParty.length = 42;
Array.prototype.someExtensionFromThirdParty.something = function() { return "Surprise!"; };
});
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
attrs.majorVersion = 2;
attrs.minorVersion = 0;
attrs.powerPreference = EM_WEBGL_POWER_PREFERENCE_DEFAULT;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context("#canvas", &attrs);
if (context)
{
memset(&attrs, -1, sizeof(attrs));
EMSCRIPTEN_RESULT res = emscripten_webgl_get_context_attributes(context, &attrs);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
assert(attrs.majorVersion == 2);
assert(attrs.powerPreference == EM_WEBGL_POWER_PREFERENCE_DEFAULT || attrs.powerPreference == EM_WEBGL_POWER_PREFERENCE_LOW_POWER || attrs.powerPreference == EM_WEBGL_POWER_PREFERENCE_HIGH_PERFORMANCE);
res = emscripten_webgl_make_context_current(context);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
assert(emscripten_webgl_get_current_context() == context);
int numExtensions = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
bool hasGLExtension = false;
for(int i = 0; i < numExtensions; ++i)
{
const char *ext = (const char *)glGetStringi(GL_EXTENSIONS, i);
printf("extension %d: %s\n", i, ext);
if (strstr(ext, "GL_") == 0)
hasGLExtension = true;
}
assert(hasGLExtension);
}
return 0;
}
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