Fixed issue #2072.

src/renderer_vk.cpp

@@ -1383,6 +1383,7 @@ VK_IMPORT_INSTANCE
 					| BGFX_CAPS_COMPUTE
 					| BGFX_CAPS_DRAW_INDIRECT
 					| BGFX_CAPS_FRAGMENT_DEPTH
+					| BGFX_CAPS_INDEX32
 					| BGFX_CAPS_INSTANCING
 					| BGFX_CAPS_TEXTURE_3D
 					| BGFX_CAPS_TEXTURE_BLIT
@@ -1391,6 +1392,7 @@ VK_IMPORT_INSTANCE
 					| BGFX_CAPS_VERTEX_ATTRIB_UINT10
 					| BGFX_CAPS_VERTEX_ID
 					);
+
 				g_caps.limits.maxTextureSize     = m_deviceProperties.limits.maxImageDimension2D;
 				g_caps.limits.maxFBAttachments   = bx::min(uint8_t(m_deviceProperties.limits.maxFragmentOutputAttachments), uint8_t(BGFX_CONFIG_MAX_FRAME_BUFFER_ATTACHMENTS) );
 				g_caps.limits.maxComputeBindings = BGFX_MAX_COMPUTE_BINDINGS;