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ImDrawList: Added ImDrawCmd::VtxOffset value to support large meshes (64k+ vertices) using 16-bits indices. To enable the feature, the renderer back-end needs to set 'io.BackendFlags |= ImGuiBackendFlags_HasVtxOffset' and honor the ImDrawCmd::VtxOffset field. Otherwise the value will always be zero. This has the advantage of preserving smaller index buffers and allowing to execute on hardware that do not support 32-bits indices.

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ImDrawList: Added ImDrawCmd::IdxOffset value, equivalent to summing element count for each draw command. This is provided for convenience and consistency with VtxOffset. (#2591)
This commit is contained in:
omar
2019-05-29 15:25:53 +02:00
parent 40b9e5e0b4
commit d1e8b698d0
6 changed files with 73 additions and 25 deletions
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13
imgui_draw.cpp
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@ -364,6 +364,7 @@ void ImDrawList::Clear()
IdxBuffer.resize(0);
VtxBuffer.resize(0);
Flags = _Data->InitialFlags;
_VtxCurrentOffset = 0;
_VtxCurrentIdx = 0;
_VtxWritePtr = NULL;
_IdxWritePtr = NULL;
@ -416,6 +417,8 @@ void ImDrawList::AddDrawCmd()
ImDrawCmd draw_cmd;
draw_cmd.ClipRect = GetCurrentClipRect();
draw_cmd.TextureId = GetCurrentTextureId();
draw_cmd.VtxOffset = _VtxCurrentOffset;
draw_cmd.IdxOffset = IdxBuffer.Size;
IM_ASSERT(draw_cmd.ClipRect.x <= draw_cmd.ClipRect.z && draw_cmd.ClipRect.y <= draw_cmd.ClipRect.w);
CmdBuffer.push_back(draw_cmd);
@ -604,6 +607,14 @@ void ImDrawList::ChannelsSetCurrent(int idx)
// NB: this can be called with negative count for removing primitives (as long as the result does not underflow)
void ImDrawList::PrimReserve(int idx_count, int vtx_count)
{
// Large mesh support (when enabled)
if (sizeof(ImDrawIdx) == 2 && (_VtxCurrentIdx + vtx_count >= (1 << 16)) && (Flags & ImDrawListFlags_AllowVtxOffset))
{
_VtxCurrentOffset = VtxBuffer.Size;
_VtxCurrentIdx = 0;
AddDrawCmd();
}
ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size-1];
draw_cmd.ElemCount += idx_count;
@ -2950,7 +2961,7 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
draw_list->CmdBuffer[draw_list->CmdBuffer.Size-1].ElemCount -= (idx_expected_size - draw_list->IdxBuffer.Size);
draw_list->_VtxWritePtr = vtx_write;
draw_list->_IdxWritePtr = idx_write;
draw_list->_VtxCurrentIdx = (unsigned int)draw_list->VtxBuffer.Size;
draw_list->_VtxCurrentIdx = vtx_current_idx;
}
//-----------------------------------------------------------------------------