From 4da26d85cdf4d84eb0e491fbfcf1efce3311d093 Mon Sep 17 00:00:00 2001
From: saschawillems <webmaster@saschawillems.de>
Date: Sun, 26 Mar 2017 19:54:59 +0200
Subject: [PATCH] Clip negative scissor offsets to zero

---
 examples/vulkan_example/imgui_impl_glfw_vulkan.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp b/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp
index 72fa5bc8..e7dfe32b 100644
--- a/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp
+++ b/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp
@@ -301,8 +301,8 @@ void ImGui_ImplGlfwVulkan_RenderDrawLists(ImDrawData* draw_data)
             else
             {
                 VkRect2D scissor;
-                scissor.offset.x = (int32_t)(pcmd->ClipRect.x);
-                scissor.offset.y = (int32_t)(pcmd->ClipRect.y);
+                scissor.offset.x = (int32_t)(pcmd->ClipRect.x) > 0 ? (int32_t)(pcmd->ClipRect.x) : 0;
+                scissor.offset.y = (int32_t)(pcmd->ClipRect.y) > 0 ? (int32_t)(pcmd->ClipRect.y) : 0;
                 scissor.extent.width = (uint32_t)(pcmd->ClipRect.z - pcmd->ClipRect.x);
                 scissor.extent.height = (uint32_t)(pcmd->ClipRect.w - pcmd->ClipRect.y + 1); // TODO: + 1??????
                 vkCmdSetScissor(g_CommandBuffer, 0, 1, &scissor);