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add warning to demo about 16-bit indices

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This commit is contained in:
Evan Pezent 2021-06-06 16:03:41 -07:00
parent 450e5b80df
commit e966e0d2bc
2 changed files with 9 additions and 2 deletions
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4
README.md
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@ -96,10 +96,10 @@ If you want to test ImPlot quickly, consider trying [mahi-gui](https://github.co
## Extremely Important Note ## Extremely Important Note
Dear ImGui uses **16-bit indexing by default**, so high-density ImPlot widgets like `ImPlot::PlotHeatmap()` may produce too many vertices into `ImDrawList`, which causes an assertion failure. This will result in data truncation and/or visual glitches. Therefore, it is **HIGHLY** recommended that you EITHER: Dear ImGui uses **16-bit indexing by default**, so high-density ImPlot widgets like `ImPlot::PlotHeatmap()` may produce too many vertices into `ImDrawList`, which causes an assertion failure and will result in data truncation and/or visual glitches. Therefore, it is **HIGHLY** recommended that you EITHER:
- **Option 1:** Enable 32-bit indices by uncommenting `#define ImDrawIdx unsigned int` in your ImGui [`imconfig.h`](https://github.com/ocornut/imgui/blob/master/imconfig.h#L89) file. - **Option 1:** Enable 32-bit indices by uncommenting `#define ImDrawIdx unsigned int` in your ImGui [`imconfig.h`](https://github.com/ocornut/imgui/blob/master/imconfig.h#L89) file.
- **Option 2:** Handle the `ImGuiBackendFlags_RendererHasVtxOffset` flag in your renderer when using 16-bit indices and use an ImGui version with patch [imgui@f6120f8](https://github.com/ocornut/imgui/commit/f6120f8e16eefcdb37b63974e6915a3dd35414be). - **Option 2:** Handle the `ImGuiBackendFlags_RendererHasVtxOffset` flag in your renderer if you must use 16-bit indices. Many of the default ImGui rendering backends already support `ImGuiBackendFlags_RendererHasVtxOffset`. Refer to [this issue](https://github.com/ocornut/imgui/issues/2591) for more information.
## FAQ ## FAQ

7
implot_demo.cpp
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@ -221,6 +221,13 @@ void ShowDemoWindow(bool* p_open) {
} }
//------------------------------------------------------------------------- //-------------------------------------------------------------------------
ImGui::Text("ImPlot says hello. (%s)", IMPLOT_VERSION); ImGui::Text("ImPlot says hello. (%s)", IMPLOT_VERSION);
// display warning about 16-bit indices
if (sizeof(ImDrawIdx)*8 == 16 && (ImGui::GetIO().BackendFlags & ImGuiBackendFlags_RendererHasVtxOffset) == false) {
ImGui::PushStyleColor(ImGuiCol_Text, ImVec4(1,1,0,1));
ImGui::TextWrapped("WARNING: ImDrawIdx is 16-bit and ImGuiBackendFlags_RendererHasVtxOffset is false. Expect visual glitches and artifacts! See README for more information.");
ImGui::PopStyleColor();
}
ImGui::Spacing(); ImGui::Spacing();
if (ImGui::CollapsingHeader("Help")) { if (ImGui::CollapsingHeader("Help")) {