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Backends: SDL_Renderer: Added support for large meshes (64k+ vertices) with 16-bit indices, enable 'ImGuiBackendFlags_RendererHasVtxOffset' in this backend. (#3926)

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Rokas Kupstys 2021-12-03 12:03:05 +02:00 committed by ocornut
parent 5b1a70aa2d
commit 5c388c39f4
3 changed files with 11 additions and 8 deletions
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14
backends/imgui_impl_sdlrenderer.cpp
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@ -10,14 +10,15 @@
// Implemented features:
// [X] Renderer: User texture binding. Use 'SDL_Texture*' as ImTextureID. Read the FAQ about ImTextureID!
// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices.
// Missing features:
// [ ] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices (SDL_RenderGeometryRaw() is missing a vertex offset).
// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
// Read online: https://github.com/ocornut/imgui/tree/master/docs
// CHANGELOG
// 2021-12-03: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
// 2021-10-06: Backup and restore modified ClipRect/Viewport.
// 2021-09-21: Initial version.
@ -61,6 +62,7 @@ bool ImGui_ImplSDLRenderer_Init(SDL_Renderer* renderer)
ImGui_ImplSDLRenderer_Data* bd = IM_NEW(ImGui_ImplSDLRenderer_Data)();
io.BackendRendererUserData = (void*)bd;
io.BackendRendererName = "imgui_impl_sdlrenderer";
io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
bd->SDLRenderer = renderer;
@ -127,7 +129,7 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
SDL_Rect ClipRect;
};
BackupSDLRendererState old = {};
old.ClipEnabled = SDL_RenderIsClipEnabled(bd->SDLRenderer);
old.ClipEnabled = SDL_RenderIsClipEnabled(bd->SDLRenderer) == SDL_TRUE;
SDL_RenderGetViewport(bd->SDLRenderer, &old.Viewport);
SDL_RenderGetClipRect(bd->SDLRenderer, &old.ClipRect);
@ -170,9 +172,9 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
SDL_Rect r = { (int)(clip_min.x), (int)(clip_min.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y) };
SDL_RenderSetClipRect(bd->SDLRenderer, &r);
const float* xy = (const float*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, pos));
const float* uv = (const float*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, uv));
const int* color = (const int*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, col));
const float* xy = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, pos));
const float* uv = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, uv));
const int* color = (const int*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col));
// Bind texture, Draw
SDL_Texture* tex = (SDL_Texture*)pcmd->GetTexID();
@ -180,7 +182,7 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
xy, (int)sizeof(ImDrawVert),
color, (int)sizeof(ImDrawVert),
uv, (int)sizeof(ImDrawVert),
cmd_list->VtxBuffer.Size,
cmd_list->VtxBuffer.Size - pcmd->VtxOffset,
idx_buffer + pcmd->IdxOffset, pcmd->ElemCount, sizeof(ImDrawIdx));
}
}

3
backends/imgui_impl_sdlrenderer.h
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@ -10,8 +10,7 @@
// Implemented features:
// [X] Renderer: User texture binding. Use 'SDL_Texture*' as ImTextureID. Read the FAQ about ImTextureID!
// Missing features:
// [ ] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices (SDL_RenderGeometryRaw() is missing a vertex offset).
// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices.
#pragma once
#include "imgui.h" // IMGUI_IMPL_API

2
docs/CHANGELOG.txt
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@ -80,6 +80,8 @@ Other Changes:
likehood of issues with people using VK_DYNAMIC_STATE_SCISSOR in their app without calling
vkCmdSetScissor() explicitly every frame. (#4644)
- Backends: DX12: Fixed DRAW_EMPTY_SCISSOR_RECTANGLE warnings. (#4775)
- Backends: SDL_Renderer: Added support for large meshes (64k+ vertices) with 16-bit indices,
enabling 'ImGuiBackendFlags_RendererHasVtxOffset' in the backend. (#3926) [@rokups]
- Backends: WebGPU: Passing explicit buffer sizes to wgpuRenderPassEncoderSetVertexBuffer() and
wgpuRenderPassEncoderSetIndexBuffer() functions as validation layers appears to not do what the
in-flux specs says. (#4766) [@meshula]