From c9bb37b668cb06e74da4752be9bccb5722b7cb71 Mon Sep 17 00:00:00 2001
From: Kyle Emmerich <emmerich.kyle@gmail.com>
Date: Thu, 25 Jun 2026 11:43:37 -0400
Subject: [PATCH] Vulkan: Fixed capture buffer size. (#3783)

captureSize used m_width for the row count, but the swap-chain readback
copies m_height rows (capture() reports _size = height * pitch, and
ReadbackVK::pitch() is width * bpp/8). A backbuffer taller than wide
under-allocates the readback buffer and overruns it. Use m_height, which
matches the GL backend's width*height*4.
---
 src/renderer_vk.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/renderer_vk.cpp b/src/renderer_vk.cpp
index 4bff6a662..e5a97e233 100644
--- a/src/renderer_vk.cpp
+++ b/src/renderer_vk.cpp
@@ -3004,7 +3004,7 @@ VK_IMPORT_DEVICE
 			{
 				const uint8_t  bpp         = bimg::getBitsPerPixel(bimg::TextureFormat::Enum(m_backBuffer.m_swapChain.m_colorFormat) );
 				const uint32_t pitch       = m_backBuffer.m_width * bpp / 8;
-				const uint32_t captureSize = m_backBuffer.m_width * pitch;
+				const uint32_t captureSize = m_backBuffer.m_height * pitch;
 
 				if (captureSize > m_captureSize)
 				{