Function init

3rdparty/bgfx/src/bgfx.cpp:3569–3692

	}

	bool init(const Init& _userInit)
	{
		if (NULL != s_ctx)
		{
			BX_TRACE("bgfx is already initialized.");
			return false;
		}

		Init init = _userInit;

		init.limits.maxEncoders       = bx::clamp<uint16_t>(init.limits.maxEncoders, 1, (0 != BGFX_CONFIG_MULTITHREADED) ? 128 : 1);
		init.limits.minResourceCbSize = bx::min<uint32_t>(init.limits.minResourceCbSize, BGFX_CONFIG_MIN_RESOURCE_COMMAND_BUFFER_SIZE);

		struct ErrorState
		{
			enum Enum
			{
				Default,
				ContextAllocated,
			};
		};

		ErrorState::Enum errorState = ErrorState::Default;

		if (NULL != init.allocator)
		{
			g_allocator = init.allocator;
		}
		else
		{
			bx::DefaultAllocator allocator;
			g_allocator =
				s_allocatorStub = BX_NEW(&allocator, AllocatorStub);
		}

		if (NULL != init.callback)
		{
			g_callback = init.callback;
		}
		else
		{
			g_callback =
				s_callbackStub = BX_NEW(g_allocator, CallbackStub);
		}

		bx::memSet(&g_caps, 0, sizeof(g_caps) );
		g_caps.limits.maxDrawCalls            = BGFX_CONFIG_MAX_DRAW_CALLS;
		g_caps.limits.maxBlits                = BGFX_CONFIG_MAX_BLIT_ITEMS;
		g_caps.limits.maxTextureSize          = 0;
		g_caps.limits.maxTextureLayers        = 1;
		g_caps.limits.maxViews                = BGFX_CONFIG_MAX_VIEWS;
		g_caps.limits.maxFrameBuffers         = BGFX_CONFIG_MAX_FRAME_BUFFERS;
		g_caps.limits.maxPrograms             = BGFX_CONFIG_MAX_PROGRAMS;
		g_caps.limits.maxShaders              = BGFX_CONFIG_MAX_SHADERS;
		g_caps.limits.maxTextures             = BGFX_CONFIG_MAX_TEXTURES;
		g_caps.limits.maxTextureSamplers      = BGFX_CONFIG_MAX_TEXTURE_SAMPLERS;
		g_caps.limits.maxComputeBindings      = 0;
		g_caps.limits.maxVertexLayouts        = BGFX_CONFIG_MAX_VERTEX_LAYOUTS;