DrawList: AddCallback() added an optional size parameter allowing to copy and store any amount of user data for usage by callbacks: (#6969, #4770, #7665)
@ -9,8 +9,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
- doc: add a proper documentation system (maybe relying on automation? #435)
- doc: checklist app to verify backends/integration of imgui (test inputs, rendering, callback, etc.).
- doc/tips: tips of the day: website? applet in imgui_club?
- doc/wiki: work on the wiki https://github.com/ocornut/imgui/wiki
- window: preserve/restore relative focus ordering (persistent or not), and e.g. of multiple reappearing windows (#2304) -> also see docking reference to same #.
- window: calling SetNextWindowSize() every frame with <= 0 doesn't do anything, may be useful to allow (particularly when used for a single axis). (#690)
- window: add a way for very transient windows (non-saved, temporary overlay over hundreds of objects) to "clean" up from the global window list. perhaps a lightweight explicit cleanup pass.
@ -44,7 +43,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
- drawlist: maintaining bounding box per command would allow to merge draw command when clipping isn't relied on (typical non-scrolling window or non-overflowing column would merge with previous command). (WIP branch)
- drawlist: make it easier to toggle AA per primitive, so we can use e.g. non-AA fill + AA borders more naturally
- drawlist: non-AA strokes have gaps between points (#593, #288), glitch especially on RenderCheckmark() and ColorPicker4().
- drawlist: callback: add an extra void* in ImDrawCallback to allow passing render-local data to the callback (would break API).
- drawlist: callback: add an extra void* in ImDrawCallback to expose render state instead of pulling from Renderer_RenderState (would break API).
- drawlist: AddRect vs AddLine position confusing (#2441)
- drawlist/opt: store rounded corners in texture to use 1 quad per corner (filled and wireframe) to lower the cost of rounding. (#1962)
- drawlist/opt: AddRect() axis aligned pixel aligned (no-aa) could use 8 triangles instead of 16 and no normal calculation.
// (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
#define IMGUI_VERSION "1.91.4 WIP"
#define IMGUI_VERSION_NUM 19132
#define IMGUI_VERSION_NUM 19133
#define IMGUI_HAS_TABLE
/*
@ -2953,9 +2953,11 @@ struct ImDrawCmd
unsignedintIdxOffset;// 4 // Start offset in index buffer.
unsignedintElemCount;// 4 // Number of indices (multiple of 3) to be rendered as triangles. Vertices are stored in the callee ImDrawList's vtx_buffer[] array, indices in idx_buffer[].
ImDrawCallbackUserCallback;// 4-8 // If != NULL, call the function instead of rendering the vertices. clip_rect and texture_id will be set normally.
void*UserCallbackData;// 4-8 // The draw callback code can access this.
void*UserCallbackData;// 4-8 // Callback user data (when UserCallback != NULL). If called AddCallback() with size == 0, this is a copy of the AddCallback() argument. If called AddCallback() with size > 0, this is pointing to a buffer where data is stored.
intUserCallbackDataSize;// 4 // Size of callback user data when using storage, otherwise 0.
intUserCallbackDataOffset;// 4 // [Internal] Offset of callback user data when using storage, otherwise -1.
ImDrawCmd(){memset(this,0,sizeof(*this));}// Also ensure our padding fields are zeroed
ImDrawCmd(){memset(this,0,sizeof(*this));}// Also ensure our padding fields are zeroed
// Since 1.83: returns ImTextureID associated with this draw call. Warning: DO NOT assume this is always same as 'TextureId' (we will change this function for an upcoming feature)
IMGUI_APIvoidAddCallback(ImDrawCallbackcallback,void*callback_data);// Your rendering function must check for 'UserCallback' in ImDrawCmd and call the function instead of rendering triangles.
// Advanced: Draw Callbacks
// - May be used to alter render state (change sampler, blending, current shader). May be used to emit custom rendering commands (difficult to do correctly, but possible).
// - Use special ImDrawCallback_ResetRenderState callback to instruct backend to reset its render state to the default.
// - Your rendering loop must check for 'UserCallback' in ImDrawCmd and call the function instead of rendering triangles. All standard backends are honoring this.
// - For some backends, the callback may access selected render-states exposed by the backend in a ImGui_ImplXXXX_RenderState structure pointed to by platform_io.Renderer_RenderState.
// - IMPORTANT: please be mindful of the different level of indirection between using size==0 (copying argument) and using size>0 (copying pointed data into a buffer).
// - If userdata_size == 0: we copy/store the 'userdata' argument as-is. It will be available unmodified in ImDrawCmd::UserCallbackData during render.
// - If userdata_size > 0, we copy/store 'userdata_size' bytes pointed to by 'userdata'. We store them in a buffer stored inside the drawlist. ImDrawCmd::UserCallbackData will point inside that buffer so you have to retrieve data from there. Your callback may need to use ImDrawCmd::UserCallbackDataSize if you expect dynamically-sized data.
// - Support for userdata_size > 0 was added in v1.91.4, October 2024. So earlier code always only allowed to copy/store a simple void*.
IMGUI_APIvoidAddDrawCmd();// This is useful if you need to forcefully create a new draw call (to allow for dependent rendering / blending). Otherwise primitives are merged into the same draw-call as much as possible
IMGUI_APIImDrawList*CloneOutput()const;// Create a clone of the CmdBuffer/IdxBuffer/VtxBuffer.
ocornut
4 weeks ago