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Reduced padding + unused storage in ImDrawList (224->192 bytes) + zero-init ImDrawListSplitter and ImDrawList

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+ Readme tweak
This commit is contained in:
ocornut
2020-11-04 13:49:16 +01:00
parent 2fa00656a4
commit d6a2f7e95e
3 changed files with 15 additions and 7 deletions
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18
imgui.h
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@ -2006,7 +2006,15 @@ struct ImDrawVert
IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT;
#endif
// For use by ImDrawListSplitter.
// [Internal] For use by ImDrawList
struct ImDrawCmdHeader
{
ImVec4 ClipRect;
ImTextureID TextureId;
unsigned int VtxOffset;
};
// [Internal] For use by ImDrawListSplitter
struct ImDrawChannel
{
ImVector<ImDrawCmd> _CmdBuffer;
@ -2021,7 +2029,7 @@ struct ImDrawListSplitter
int _Count; // Number of active channels (1+)
ImVector<ImDrawChannel> _Channels; // Draw channels (not resized down so _Count might be < Channels.Size)
inline ImDrawListSplitter() { Clear(); }
inline ImDrawListSplitter() { memset(this, 0, sizeof(*this)); }
inline ~ImDrawListSplitter() { ClearFreeMemory(); }
inline void Clear() { _Current = 0; _Count = 1; } // Do not clear Channels[] so our allocations are reused next frame
IMGUI_API void ClearFreeMemory();
@ -2072,19 +2080,19 @@ struct ImDrawList
ImDrawListFlags Flags; // Flags, you may poke into these to adjust anti-aliasing settings per-primitive.
// [Internal, used while building lists]
unsigned int _VtxCurrentIdx; // [Internal] generally == VtxBuffer.Size unless we are past 64K vertices, in which case this gets reset to 0.
const ImDrawListSharedData* _Data; // Pointer to shared draw data (you can use ImGui::GetDrawListSharedData() to get the one from current ImGui context)
const char* _OwnerName; // Pointer to owner window's name for debugging
unsigned int _VtxCurrentIdx; // [Internal] Generally == VtxBuffer.Size unless we are past 64K vertices, in which case this gets reset to 0.
ImDrawVert* _VtxWritePtr; // [Internal] point within VtxBuffer.Data after each add command (to avoid using the ImVector<> operators too much)
ImDrawIdx* _IdxWritePtr; // [Internal] point within IdxBuffer.Data after each add command (to avoid using the ImVector<> operators too much)
ImVector<ImVec4> _ClipRectStack; // [Internal]
ImVector<ImTextureID> _TextureIdStack; // [Internal]
ImVector<ImVec2> _Path; // [Internal] current path building
ImDrawCmd _CmdHeader; // [Internal] Template of active commands. Fields should match those of CmdBuffer.back().
ImDrawCmdHeader _CmdHeader; // [Internal] template of active commands. Fields should match those of CmdBuffer.back().
ImDrawListSplitter _Splitter; // [Internal] for channels api (note: prefer using your own persistent instance of ImDrawListSplitter!)
// If you want to create ImDrawList instances, pass them ImGui::GetDrawListSharedData() or create and use your own ImDrawListSharedData (so you can use ImDrawList without ImGui)
ImDrawList(const ImDrawListSharedData* shared_data) { _Data = shared_data; Flags = ImDrawListFlags_None; _VtxCurrentIdx = 0; _VtxWritePtr = NULL; _IdxWritePtr = NULL; _OwnerName = NULL; }
ImDrawList(const ImDrawListSharedData* shared_data) { memset(this, 0, sizeof(*this)); _Data = shared_data; }
~ImDrawList() { _ClearFreeMemory(); }
IMGUI_API void PushClipRect(ImVec2 clip_rect_min, ImVec2 clip_rect_max, bool intersect_with_current_clip_rect = false); // Render-level scissoring. This is passed down to your render function but not used for CPU-side coarse clipping. Prefer using higher-level ImGui::PushClipRect() to affect logic (hit-testing and widget culling)