Vulkan: Avoid passing negative coordinates to vkCmdSetScissor, which debug validation layers do not like.
diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 316e69f..a4cbd4d 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -48,6 +48,7 @@
GL function loaders early, and help users understand what they are missing. (#2421)
- Examples: OpenGL3: Minor tweaks + not calling glBindBuffer more than necessary in the render loop.
- Examples: Vulkan: Added missing support for 32-bit indices (#define ImDrawIdx unsigned int).
+- Examples: Vulkan: Avoid passing negative coordinates to vkCmdSetScissor, which debug validation layers do not like.
- Examples: DirectX9: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects(). (#2454)
- Examples: GLUT: Fixed existing FreeGLUT example to work with regular GLUT. (#2465) [@andrewwillmott]
- Examples: GLUT: Renamed imgui_impl_freeglut.cpp/.h to imgui_impl_glut.cpp/.h. (#2465) [@andrewwillmott]
diff --git a/examples/imgui_impl_vulkan.cpp b/examples/imgui_impl_vulkan.cpp
index f22efd5..2d49793 100644
--- a/examples/imgui_impl_vulkan.cpp
+++ b/examples/imgui_impl_vulkan.cpp
@@ -13,6 +13,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
+// 2019-04-04: Vulkan: Avoid passing negative coordinates to vkCmdSetScissor, which debug validation layers do not like.
// 2019-04-01: Vulkan: Support for 32-bit index buffer (#define ImDrawIdx unsigned int).
// 2019-02-16: Vulkan: Viewport and clipping rectangles correctly using draw_data->FramebufferScale to allow retina display.
// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
@@ -347,6 +348,12 @@
if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f)
{
+ // Negative offsets are illegal for vkCmdSetScissor
+ if (clip_rect.x < 0.0f)
+ clip_rect.x = 0.0f;
+ if (clip_rect.y < 0.0f)
+ clip_rect.y = 0.0f;
+
// Apply scissor/clipping rectangle
VkRect2D scissor;
scissor.offset.x = (int32_t)(clip_rect.x);
