From 0551295157ce9257127336d934075253f16defd4 Mon Sep 17 00:00:00 2001
From: CasualPokePlayer <50538166+CasualPokePlayer@users.noreply.github.com>
Date: Fri, 24 May 2024 21:20:22 -0700
Subject: [PATCH] Fix glDrawElementsBaseVertex call

indexStart should indicate the starting index element, but glDrawElementsBaseVertex expects the byte offset (i.e. 2 * indexStart)
---
 src/BizHawk.Bizware.Graphics/OpenGL/IGL_OpenGL.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/BizHawk.Bizware.Graphics/OpenGL/IGL_OpenGL.cs b/src/BizHawk.Bizware.Graphics/OpenGL/IGL_OpenGL.cs
index 8ddef31499..2d9ae729dc 100644
--- a/src/BizHawk.Bizware.Graphics/OpenGL/IGL_OpenGL.cs
+++ b/src/BizHawk.Bizware.Graphics/OpenGL/IGL_OpenGL.cs
@@ -87,7 +87,7 @@ namespace BizHawk.Bizware.Graphics
 			=> GL.DrawArrays(PrimitiveType.TriangleStrip, 0, (uint)vertexCount);
 
 		public unsafe void DrawIndexed(int indexCount, int indexStart, int vertexStart)
-			=> GL.DrawElementsBaseVertex(PrimitiveType.Triangles, (uint)indexCount, DrawElementsType.UnsignedShort, (void*)indexStart, vertexStart);
+			=> GL.DrawElementsBaseVertex(PrimitiveType.Triangles, (uint)indexCount, DrawElementsType.UnsignedShort, (void*)(indexStart * 2), vertexStart);
 
 		public ITexture2D CreateTexture(int width, int height)
 			=> new OpenGLTexture2D(GL, width, height);