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Support Vulkan Loader and VVL on iOS Simulator for SDKs >= 1.4.357 #1572

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Support Vulkan Loader and VVL on iOS Simulator for SDKs >= 1.4.357 #1572

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a22a7c2
Support Vulkan Loader and VVL on iOS Simulator for SDK >= 1.4.357
SRSaunders Aug 31, 2026
3329ffd
Fix bind_vertex_buffers() validation errors in gui.h for iOS Simulator
SRSaunders Sep 8, 2026
3a509ba
Merge branch 'KhronosGroup:main' into iossim-loader-vvl
SRSaunders Sep 9, 2026
c190e19
Merge branch 'KhronosGroup:main' into iossim-loader-vvl
SRSaunders Sep 11, 2026
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3 changes: 2 additions & 1 deletion bldsys/cmake/global_options.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,9 @@ if(APPLE)

# the following assumes MoltenVK is used for these cases: a) standalone deployment on macOS (i.e. set USE_MoltenVK=ON), and b) for iOS deployment
# if this assumption changes (e.g. KosmicKrisp adds standalone or iOS support), then this section will require modification to handle optionality
# note: Vulkan SDK 1.4.357+ now provides xcframeworks for the Vulkan loader and Validation Layers for iphonesimulator on arm64 and x86_64 hosts
find_package(Vulkan QUIET OPTIONAL_COMPONENTS MoltenVK)
if(USE_MoltenVK OR (IOS AND (NOT Vulkan_MoltenVK_FOUND OR ${CMAKE_OSX_SYSROOT} STREQUAL "iphonesimulator")))
if(USE_MoltenVK OR (IOS AND (NOT Vulkan_MoltenVK_FOUND OR (${CMAKE_OSX_SYSROOT} STREQUAL "iphonesimulator" AND Vulkan_VERSION VERSION_LESS "1.4.357"))))
# if using MoltenVK standalone, or MoltenVK for iOS not found or using iOS Simulator, look for MoltenVK in Vulkan SDK and MoltenVK project paths
if(NOT Vulkan_MoltenVK_LIBRARY)
# since both are available in the Vulkan SDK and MoltenVK github project, make sure we look for MoltenVK framework on iOS and dylib on macOS
Expand Down
13 changes: 11 additions & 2 deletions framework/gui.h
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Original file line number Diff line number Diff line change
Expand Up @@ -645,7 +645,10 @@ inline void
#if defined(PLATFORM__MACOS) && TARGET_OS_IOS && TARGET_OS_SIMULATOR
// iOS Simulator does not support vkCmdDrawIndexed() with vertex_offset > 0, so rebind vertex buffer instead
vertex_offsets[0] += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert);
command_buffer.bindVertexBuffers(0, vertex_buffer_handle, vertex_offsets);
if (vertex_offsets[0] < vertex_buffer->get_size())
{
command_buffer.bindVertexBuffers(0, vertex_buffer_handle, vertex_offsets);
}
#else
vertex_offset += cmd_list->VtxBuffer.Size;
#endif
Expand Down Expand Up @@ -753,6 +756,7 @@ inline void Gui<bindingType>::draw_impl(vkb::core::CommandBufferCpp &command_buf

std::vector<std::reference_wrapper<const vkb::core::BufferCpp>> vertex_buffers;
std::vector<vk::DeviceSize> vertex_offsets;
vk::DeviceSize vertex_size;

// If a render context is used, then use the frames buffer pools to allocate GUI vertex/index data from
if (!explicit_update)
Expand All @@ -763,12 +767,14 @@ inline void Gui<bindingType>::draw_impl(vkb::core::CommandBufferCpp &command_buf
{
vertex_buffers.push_back(vertex_allocation.get_buffer());
vertex_offsets.push_back(vertex_allocation.get_offset());
vertex_size = vertex_allocation.get_size();
}
}
else
{
vertex_buffers.push_back(*vertex_buffer);
vertex_offsets.push_back(0);
vertex_size = vertex_buffer->get_size();
command_buffer.bind_vertex_buffers(0, vertex_buffers, vertex_offsets);
command_buffer.bind_index_buffer(*index_buffer, 0, vk::IndexType::eUint16);
}
Expand Down Expand Up @@ -821,7 +827,10 @@ inline void Gui<bindingType>::draw_impl(vkb::core::CommandBufferCpp &command_buf
if (!vertex_offsets.empty())
{
vertex_offsets.back() += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert);
command_buffer.bind_vertex_buffers(0, vertex_buffers, vertex_offsets);
if (vertex_offsets.back() < vertex_size)
{
command_buffer.bind_vertex_buffers(0, vertex_buffers, vertex_offsets);
}
}
#else
vertex_offset += cmd_list->VtxBuffer.Size;
Expand Down
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