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#include <stdio.h>
#include <string.h>
#include <emscripten/html5.h>
#include <GLES2/gl2.h>
#include <webgl/webgl1_ext.h>
#include <assert.h>
int main()
{
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
attr.enableExtensionsByDefault = 0;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context("#canvas", &attr);
emscripten_webgl_make_context_current(ctx);
assert(!glGetError());
// This should gracefully return null and record a GL error.
const char *str = (const char *)glGetString(GL_UNMASKED_VENDOR_WEBGL);
printf("%s\n", str);
assert(glGetError());
assert(!glGetError()); // One error is enough
bool success = emscripten_webgl_enable_extension(ctx, "WEBGL_debug_renderer_info");
if (!success)
{
// Browser does not have WEBGL_debug_renderer_info, skip remainder and return success.
return 0;
}
assert(!glGetError());
str = (const char *)glGetString(GL_UNMASKED_VENDOR_WEBGL);
printf("%s\n", str);
assert(strlen(str) > 3); // Should get something (dependent on hardware)
assert(!glGetError());
return 0;
}
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