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// Copyright 2014 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 <assert.h>
#include <emscripten.h>
#include <emscripten/html5.h>
#include <webgl/webgl1.h>
#ifndef WEBGL_CONTEXT_VERSION
#error Build with -DWEBGL_CONTEXT_VERSION=1 or -DWEBGL_CONTEXT_VERSION=2!
#endif
#ifndef WEBGL_SIMPLE_ENABLE_EXTENSION
#error Build with -DWEBGL_SIMPLE_ENABLE_EXTENSION=1 or -DWEBGL_SIMPLE_ENABLE_EXTENSION=0!
#endif
int hasext(const char *exts, const char *ext) // from cube2, zlib licensed
{
int len = strlen(ext);
if(len) for(const char *cur = exts; (cur = strstr(cur, ext)); cur += len)
{
if((cur == exts || cur[-1] == ' ') && (cur[len] == ' ' || !cur[len])) return 1;
}
return 0;
}
int main()
{
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context;
EMSCRIPTEN_RESULT res;
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
attrs.majorVersion = WEBGL_CONTEXT_VERSION;
context = emscripten_webgl_create_context("#canvas", &attrs);
assert(context > 0); // Must have received a valid context.
res = emscripten_webgl_make_context_current(context);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
const char *exts = (const char *)glGetString(GL_EXTENSIONS);
if (hasext(exts, "ANGLE_instanced_arrays"))
assert(emscripten_webgl_enable_ANGLE_instanced_arrays(context));
if (hasext(exts, "OES_vertex_array_object"))
assert(emscripten_webgl_enable_OES_vertex_array_object(context));
if (hasext(exts, "WEBGL_draw_buffers"))
assert(emscripten_webgl_enable_WEBGL_draw_buffers(context));
if (hasext(exts, "WEBGL_draw_instanced_base_vertex_base_instance"))
assert(emscripten_webgl_enable_WEBGL_draw_instanced_base_vertex_base_instance(context));
if (hasext(exts, "WEBGL_multi_draw"))
assert(emscripten_webgl_enable_WEBGL_multi_draw(context));
if (hasext(exts, "WEBGL_multi_draw_instanced_base_vertex_base_instance"))
assert(emscripten_webgl_enable_WEBGL_multi_draw_instanced_base_vertex_base_instance(context));
if (hasext(exts, "EXT_polygon_offset_clamp"))
assert(emscripten_webgl_enable_EXT_polygon_offset_clamp(context));
if (hasext(exts, "EXT_clip_control"))
assert(emscripten_webgl_enable_EXT_clip_control(context));
if (hasext(exts, "WEBGL_polygon_mode"))
assert(emscripten_webgl_enable_WEBGL_polygon_mode(context));
#if WEBGL_SIMPLE_ENABLE_EXTENSION
assert(hasext(exts, "ANGLE_instanced_arrays") == emscripten_webgl_enable_extension(context, "ANGLE_instanced_arrays"));
assert(hasext(exts, "OES_vertex_array_object") == emscripten_webgl_enable_extension(context, "OES_vertex_array_object"));
assert(hasext(exts, "WEBGL_draw_buffers") == emscripten_webgl_enable_extension(context, "WEBGL_draw_buffers"));
assert(hasext(exts, "WEBGL_draw_instanced_base_vertex_base_instance") == emscripten_webgl_enable_extension(context, "WEBGL_draw_instanced_base_vertex_base_instance"));
assert(hasext(exts, "WEBGL_multi_draw") == emscripten_webgl_enable_extension(context, "WEBGL_multi_draw"));
assert(hasext(exts, "WEBGL_multi_draw_instanced_base_vertex_base_instance") == emscripten_webgl_enable_extension(context, "WEBGL_multi_draw_instanced_base_vertex_base_instance"));
#endif
return 0;
}
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