Added extra error checking when creating frame buffer.

src/bgfx.cpp

@@ -2656,6 +2656,11 @@ again:
 	FrameBufferHandle createFrameBuffer(uint8_t _num, TextureHandle* _handles, bool _destroyTextures)
 	{
 		BGFX_CHECK_MAIN_THREAD();
+		BX_CHECK(_num != 0, "Number of frame buffer attachments can't be 0.");
+		BX_CHECK(_num <= BGFX_CONFIG_MAX_FRAME_BUFFER_ATTACHMENTS, "Number of frame buffer attachments is larger than allowed %d (max: %d)."
+			, _num
+			, BGFX_CONFIG_MAX_FRAME_BUFFER_ATTACHMENTS
+			);
 		BX_CHECK(NULL != _handles, "_handles can't be NULL");
 		FrameBufferHandle handle = s_ctx->createFrameBuffer(_num, _handles);
 		if (_destroyTextures)

src/bgfx_p.h

@@ -2875,10 +2875,12 @@ namespace bgfx
 				FrameBufferRef& ref = m_frameBufferRef[handle.idx];
 				ref.m_window = false;
 				memset(ref.un.m_th, 0xff, sizeof(ref.un.m_th) );
+				BackbufferRatio::Enum bbRatio = BackbufferRatio::Enum(m_textureRef[_handles[0].idx].m_bbRatio);
 				for (uint32_t ii = 0; ii < _num; ++ii)
 				{
 					TextureHandle texHandle = _handles[ii];
 					BGFX_CHECK_HANDLE("createFrameBuffer texture handle", m_textureHandle, texHandle);
+					BX_CHECK(bbRatio == m_textureRef[texHandle.idx].m_bbRatio, "Mismatch in texture back-buffer ratio.");
 
 					cmdbuf.write(texHandle);