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ImDrawListSplitter: Don't merge draw commands when crossing a VtxOffset boundary + Renamed fields ImDrawChannels to consistently suggest those are internal structures.

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This commit is contained in:
omar 2019-06-10 15:41:04 +02:00
parent d8435c7710
commit a9b5c834b6
2 changed files with 30 additions and 30 deletions
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6
imgui.h
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@ -1824,8 +1824,8 @@ IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT;
// For use by ImDrawListSplitter.
struct ImDrawChannel
{
ImVector<ImDrawCmd> CmdBuffer;
ImVector<ImDrawIdx> IdxBuffer;
ImVector<ImDrawCmd> _CmdBuffer;
ImVector<ImDrawIdx> _IdxBuffer;
};
// Split/Merge functions are used to split the draw list into different layers which can be drawn into out of order.
@ -1834,7 +1834,7 @@ struct ImDrawListSplitter
{
int _Current; // Current channel number (0)
int _Count; // Number of active channels (1+)
ImVector<ImDrawChannel> _Channels; // Draw channels (not resized down so Count might be < Channels.Size)
ImVector<ImDrawChannel> _Channels; // Draw channels (not resized down so _Count might be < Channels.Size)
inline ImDrawListSplitter() { Clear(); }
inline void Clear() { _Current = 0; _Count = 1; } // Do not clear Channels[] so our allocations are reused next frame

54
imgui_draw.cpp
View File

@ -1203,8 +1203,8 @@ void ImDrawListSplitter::ClearFreeMemory()
{
if (i == _Current)
memset(&_Channels[i], 0, sizeof(_Channels[i])); // Current channel is a copy of CmdBuffer/IdxBuffer, don't destruct again
_Channels[i].CmdBuffer.clear();
_Channels[i].IdxBuffer.clear();
_Channels[i]._CmdBuffer.clear();
_Channels[i]._IdxBuffer.clear();
}
_Current = 0;
_Count = 1;
@ -1231,22 +1231,22 @@ void ImDrawListSplitter::Split(ImDrawList* draw_list, int channels_count)
}
else
{
_Channels[i].CmdBuffer.resize(0);
_Channels[i].IdxBuffer.resize(0);
_Channels[i]._CmdBuffer.resize(0);
_Channels[i]._IdxBuffer.resize(0);
}
if (_Channels[i].CmdBuffer.Size == 0)
if (_Channels[i]._CmdBuffer.Size == 0)
{
ImDrawCmd draw_cmd;
draw_cmd.ClipRect = draw_list->_ClipRectStack.back();
draw_cmd.TextureId = draw_list->_TextureIdStack.back();
_Channels[i].CmdBuffer.push_back(draw_cmd);
_Channels[i]._CmdBuffer.push_back(draw_cmd);
}
}
}
static inline bool CanMergeDrawCommands(ImDrawCmd* a, ImDrawCmd* b)
{
return memcmp(&a->ClipRect, &b->ClipRect, sizeof(a->ClipRect)) == 0 && a->TextureId == b->TextureId && !a->UserCallback && !b->UserCallback;
return memcmp(&a->ClipRect, &b->ClipRect, sizeof(a->ClipRect)) == 0 && a->TextureId == b->TextureId && a->VtxOffset == b->VtxOffset && !a->UserCallback && !b->UserCallback;
}
void ImDrawListSplitter::Merge(ImDrawList* draw_list)
@ -1262,28 +1262,28 @@ void ImDrawListSplitter::Merge(ImDrawList* draw_list)
// Calculate our final buffer sizes. Also fix the incorrect IdxOffset values in each command.
int new_cmd_buffer_count = 0;
int new_idx_buffer_count = 0;
ImDrawCmd* last_cmd = (_Count > 0 && _Channels[0].CmdBuffer.Size > 0) ? &_Channels[0].CmdBuffer.back() : NULL;
ImDrawCmd* last_cmd = (_Count > 0 && _Channels[0]._CmdBuffer.Size > 0) ? &_Channels[0]._CmdBuffer.back() : NULL;
int idx_offset = last_cmd ? last_cmd->IdxOffset + last_cmd->ElemCount : 0;
for (int i = 1; i < _Count; i++)
{
ImDrawChannel& ch = _Channels[i];
if (ch.CmdBuffer.Size > 0 && ch.CmdBuffer.back().ElemCount == 0)
ch.CmdBuffer.pop_back();
if (ch.CmdBuffer.Size > 0 && last_cmd != NULL && CanMergeDrawCommands(last_cmd, &ch.CmdBuffer[0]))
if (ch._CmdBuffer.Size > 0 && ch._CmdBuffer.back().ElemCount == 0)
ch._CmdBuffer.pop_back();
if (ch._CmdBuffer.Size > 0 && last_cmd != NULL && CanMergeDrawCommands(last_cmd, &ch._CmdBuffer[0]))
{
// Merge previous channel last draw command with current channel first draw command if matching.
last_cmd->ElemCount += ch.CmdBuffer[0].ElemCount;
idx_offset += ch.CmdBuffer[0].ElemCount;
ch.CmdBuffer.erase(ch.CmdBuffer.Data);
last_cmd->ElemCount += ch._CmdBuffer[0].ElemCount;
idx_offset += ch._CmdBuffer[0].ElemCount;
ch._CmdBuffer.erase(ch._CmdBuffer.Data);
}
if (ch.CmdBuffer.Size > 0)
last_cmd = &ch.CmdBuffer.back();
new_cmd_buffer_count += ch.CmdBuffer.Size;
new_idx_buffer_count += ch.IdxBuffer.Size;
for (int cmd_n = 0; cmd_n < ch.CmdBuffer.Size; cmd_n++)
if (ch._CmdBuffer.Size > 0)
last_cmd = &ch._CmdBuffer.back();
new_cmd_buffer_count += ch._CmdBuffer.Size;
new_idx_buffer_count += ch._IdxBuffer.Size;
for (int cmd_n = 0; cmd_n < ch._CmdBuffer.Size; cmd_n++)
{
ch.CmdBuffer.Data[cmd_n].IdxOffset = idx_offset;
idx_offset += ch.CmdBuffer.Data[cmd_n].ElemCount;
ch._CmdBuffer.Data[cmd_n].IdxOffset = idx_offset;
idx_offset += ch._CmdBuffer.Data[cmd_n].ElemCount;
}
}
draw_list->CmdBuffer.resize(draw_list->CmdBuffer.Size + new_cmd_buffer_count);
@ -1295,8 +1295,8 @@ void ImDrawListSplitter::Merge(ImDrawList* draw_list)
for (int i = 1; i < _Count; i++)
{
ImDrawChannel& ch = _Channels[i];
if (int sz = ch.CmdBuffer.Size) { memcpy(cmd_write, ch.CmdBuffer.Data, sz * sizeof(ImDrawCmd)); cmd_write += sz; }
if (int sz = ch.IdxBuffer.Size) { memcpy(idx_write, ch.IdxBuffer.Data, sz * sizeof(ImDrawIdx)); idx_write += sz; }
if (int sz = ch._CmdBuffer.Size) { memcpy(cmd_write, ch._CmdBuffer.Data, sz * sizeof(ImDrawCmd)); cmd_write += sz; }
if (int sz = ch._IdxBuffer.Size) { memcpy(idx_write, ch._IdxBuffer.Data, sz * sizeof(ImDrawIdx)); idx_write += sz; }
}
draw_list->_IdxWritePtr = idx_write;
draw_list->UpdateClipRect(); // We call this instead of AddDrawCmd(), so that empty channels won't produce an extra draw call.
@ -1309,11 +1309,11 @@ void ImDrawListSplitter::SetCurrentChannel(ImDrawList* draw_list, int idx)
if (_Current == idx)
return;
// Overwrite ImVector (12/16 bytes), four times. This is merely a silly optimization instead of doing .swap()
memcpy(&_Channels.Data[_Current].CmdBuffer, &draw_list->CmdBuffer, sizeof(draw_list->CmdBuffer));
memcpy(&_Channels.Data[_Current].IdxBuffer, &draw_list->IdxBuffer, sizeof(draw_list->IdxBuffer));
memcpy(&_Channels.Data[_Current]._CmdBuffer, &draw_list->CmdBuffer, sizeof(draw_list->CmdBuffer));
memcpy(&_Channels.Data[_Current]._IdxBuffer, &draw_list->IdxBuffer, sizeof(draw_list->IdxBuffer));
_Current = idx;
memcpy(&draw_list->CmdBuffer, &_Channels.Data[idx].CmdBuffer, sizeof(draw_list->CmdBuffer));
memcpy(&draw_list->IdxBuffer, &_Channels.Data[idx].IdxBuffer, sizeof(draw_list->IdxBuffer));
memcpy(&draw_list->CmdBuffer, &_Channels.Data[idx]._CmdBuffer, sizeof(draw_list->CmdBuffer));
memcpy(&draw_list->IdxBuffer, &_Channels.Data[idx]._IdxBuffer, sizeof(draw_list->IdxBuffer));
draw_list->_IdxWritePtr = draw_list->IdxBuffer.Data + draw_list->IdxBuffer.Size;
}