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Examples/Backends: Metal: Added support for large meshes (64k+ vertices) with 16-bits indices, enable 'ImGuiBackendFlags_HasVtxOffset' config flag in back-end. (#2591, #2592)

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Max Thrun 2019-05-29 10:35:41 -07:00 committed by omar
parent 7755cbbef2
commit ed79b4d22e
3 changed files with 8 additions and 6 deletions
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2
docs/CHANGELOG.txt
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@ -71,7 +71,7 @@ Other Changes:
- Backends: Add native Mac clipboard copy/paste default implementation in core library to match what we are
dealing with Win32, and to facilitate integration in custom engines. (#2546) [@andrewwillmott]
- Backends: OSX: imgui_impl_osx: Added mouse cursor support. (#2585, #1873) [@actboy168]
- Examples/Backends: DirectX9/10/11/12, Vulkan, OpenGL3 (Desktop GL only): Added support for large meshes
- Examples/Backends: DirectX9/10/11/12, Metal, Vulkan, OpenGL3 (Desktop GL only): Added support for large meshes
(64k+ vertices) with 16-bits indices, enable 'ImGuiBackendFlags_RendererHasVtxOffset' in those back-ends.
- Examples/Backends: Don't filter characters under 0x10000 before calling io.AddInputCharacter(),
the filtering is done in io.AddInputCharacter() itself. This is in prevision for fuller Unicode

1
examples/imgui_impl_metal.h
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@ -3,6 +3,7 @@
// Implemented features:
// [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bits indices.
// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.

11
examples/imgui_impl_metal.mm
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@ -3,6 +3,7 @@
// Implemented features:
// [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bits indices.
// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
@ -10,6 +11,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2019-05-29: Metal: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
// 2019-04-30: Metal: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
// 2019-02-11: Metal: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
@ -76,6 +78,7 @@ bool ImGui_ImplMetal_Init(id<MTLDevice> device)
{
ImGuiIO& io = ImGui::GetIO();
io.BackendRendererName = "imgui_impl_metal";
io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
@ -478,13 +481,10 @@ void ImGui_ImplMetal_DestroyDeviceObjects()
for (int n = 0; n < drawData->CmdListsCount; n++)
{
const ImDrawList* cmd_list = drawData->CmdLists[n];
ImDrawIdx idx_buffer_offset = 0;
memcpy((char *)vertexBuffer.buffer.contents + vertexBufferOffset, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
memcpy((char *)indexBuffer.buffer.contents + indexBufferOffset, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
[commandEncoder setVertexBufferOffset:vertexBufferOffset atIndex:0];
for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
{
const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
@ -522,14 +522,15 @@ void ImGui_ImplMetal_DestroyDeviceObjects()
// Bind texture, Draw
if (pcmd->TextureId != NULL)
[commandEncoder setFragmentTexture:(__bridge id<MTLTexture>)(pcmd->TextureId) atIndex:0];
[commandEncoder setVertexBufferOffset:(vertexBufferOffset + pcmd->VtxOffset * sizeof(ImDrawVert)) atIndex:0];
[commandEncoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle
indexCount:pcmd->ElemCount
indexType:sizeof(ImDrawIdx) == 2 ? MTLIndexTypeUInt16 : MTLIndexTypeUInt32
indexBuffer:indexBuffer.buffer
indexBufferOffset:indexBufferOffset + idx_buffer_offset];
indexBufferOffset:indexBufferOffset + pcmd->IdxOffset * sizeof(ImDrawIdx)];
}
}
idx_buffer_offset += pcmd->ElemCount * sizeof(ImDrawIdx);
}
vertexBufferOffset += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert);