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Added PrimUnreserve() API. Obsoleted calling ImDrawList::PrimReserve() with a negative count.

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This commit is contained in:
Ben Carter
2019-11-22 22:06:44 +09:00
committed by omar
parent e4a59d0025
commit 697f15e339
5 changed files with 26 additions and 4 deletions
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18
imgui_draw.cpp
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@ -516,10 +516,13 @@ void ImDrawList::PopTextureID()
UpdateTextureID();
}
// NB: this can be called with negative count for removing primitives (as long as the result does not underflow)
// Reserve space for a number of vertices and indices.
// You must finish filling your reserved data before calling PrimReserve() again, as it may reallocate or
// submit the intermediate results. PrimUnreserve() can be used to release unused allocations.
void ImDrawList::PrimReserve(int idx_count, int vtx_count)
{
// Large mesh support (when enabled)
IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0);
if (sizeof(ImDrawIdx) == 2 && (_VtxCurrentIdx + vtx_count >= (1 << 16)) && (Flags & ImDrawListFlags_AllowVtxOffset))
{
_VtxCurrentOffset = VtxBuffer.Size;
@ -527,7 +530,7 @@ void ImDrawList::PrimReserve(int idx_count, int vtx_count)
AddDrawCmd();
}
ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size-1];
ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size - 1];
draw_cmd.ElemCount += idx_count;
int vtx_buffer_old_size = VtxBuffer.Size;
@ -539,6 +542,17 @@ void ImDrawList::PrimReserve(int idx_count, int vtx_count)
_IdxWritePtr = IdxBuffer.Data + idx_buffer_old_size;
}
// Release the a number of reserved vertices/indices from the end of the last reservation made with PrimReserve().
void ImDrawList::PrimUnreserve(int idx_count, int vtx_count)
{
IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0);
ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size - 1];
draw_cmd.ElemCount -= idx_count;
VtxBuffer.shrink(VtxBuffer.Size - vtx_count);
IdxBuffer.shrink(IdxBuffer.Size - idx_count);
}
// Fully unrolled with inline call to keep our debug builds decently fast.
void ImDrawList::PrimRect(const ImVec2& a, const ImVec2& c, ImU32 col)
{