commit a4fa9c2782dabfa279c6fa2bb3cd29dfa4b1ebdd
author Luc Ferron <lucferron@chromium.org> Fri Apr 13 07:00:56 2018 -0400
committer Commit Bot <commit-bot@chromium.org> Mon Apr 16 15:23:51 2018 +0000
tree db7784476f731326cda3d86789960c9cfbe13e22
parent 20fa8d5cfe9e0cd437230677f1f37350a2bb87f5

Vulkan: drawElements with GL_LINE_LOOP and an offset

Also enables a test in LineLoopTest that validates this case.

Bug: angleproject:2473

Change-Id: Icb4c5735c11be40cdeceaa051f5a5cef33fd22c6
Reviewed-on: https://chromium-review.googlesource.com/1011669
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/libANGLE/renderer/vulkan/VertexArrayVk.cpp

diff --git a/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp b/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
index 24efd58..81919a7 100644
--- a/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
+++ b/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
@@ -415,9 +415,11 @@
         }
         else
         {
+            // When using an element array buffer, 'indices' is an offset to the first element.
+            intptr_t offset                = reinterpret_cast<intptr_t>(drawCallParams.indices());
             BufferVk *elementArrayBufferVk = vk::GetImpl(elementArrayBuffer);
             ANGLE_TRY(mLineLoopHelper.getIndexBufferForElementArrayBuffer(
-                renderer, elementArrayBufferVk, indexType, drawCallParams.indexCount(),
+                renderer, elementArrayBufferVk, indexType, drawCallParams.indexCount(), offset,
                 &mCurrentElementArrayBufferHandle, &mCurrentElementArrayBufferOffset));
         }
     }