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AddCircle, AddCircleFilled: Add auto-calculation of circle segment counts (amends)

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Tweak default max error value, Changelog, comments, path-fast for 12 segments circles, made LUT store ImU8
This commit is contained in:
omar
2020-01-08 00:10:18 +01:00
parent 051ce0765e
commit 5363af7f47
6 changed files with 89 additions and 61 deletions
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20
imgui_internal.h
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@ -848,7 +848,13 @@ struct ImGuiColumns
}
};
// Helper function to calculate a circle's segment count given its radius and a "maximum error" value.
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN 12
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX 512
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(_RAD,_MAXERROR) ImClamp((int)((IM_PI * 2.0f) / ImAcos((_RAD - _MAXERROR) / _RAD)), IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX)
// Data shared between all ImDrawList instances
// You may want to create your own instance of this if you want to use ImDrawList completely without ImGui. In that case, watch out for future changes to this structure.
struct IMGUI_API ImDrawListSharedData
{
ImVec2 TexUvWhitePixel; // UV of white pixel in the atlas
@ -859,18 +865,12 @@ struct IMGUI_API ImDrawListSharedData
ImVec4 ClipRectFullscreen; // Value for PushClipRectFullscreen()
ImDrawListFlags InitialFlags; // Initial flags at the beginning of the frame (it is possible to alter flags on a per-drawlist basis afterwards)
// Const data
// FIXME: Bake rounded corners fill/borders in atlas
ImVec2 CircleVtx12[12];
// Cached circle segment counts for the first <n> radii (to avoid calculation overhead)
static const int NumCircleSegmentCounts = 64;// Number of circle segment counts to cache (i.e. the maximum radius before we calculate dynamically)
int CircleSegmentCounts[NumCircleSegmentCounts]; // The segment count for radius (array index + 1)
float CircleSegmentCountsMaxCircleSegmentError; // The MaxCircleSegmentError used to calculate these counts
void RecalculateCircleSegmentCounts(); // Recalculate circle segment counts based on the current MaxCircleSegmentError
// [Internal] Lookup tables
ImVec2 CircleVtx12[12]; // FIXME: Bake rounded corners fill/borders in atlas
ImU8 CircleSegmentCounts[64]; // Precomputed segment count for given radius (array index + 1) before we calculate it dynamically (to avoid calculation overhead)
ImDrawListSharedData();
void SetCircleSegmentMaxError(float max_error);
};
struct ImDrawDataBuilder