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ImDrawList: Fixed issues with channels split/merge. Functional without manually adding a draw cmd. + Removed unnecessary parameter to Channe

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This commit is contained in:
ocornut 2015-08-25 16:24:17 +01:00
parent ad00d88923
commit 77b82ecad7
3 changed files with 40 additions and 27 deletions
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54
imgui_draw.cpp
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@ -85,7 +85,7 @@ using namespace IMGUI_STB_NAMESPACE;
// ImDrawList
//-----------------------------------------------------------------------------
static ImVec4 GNullClipRect(-9999.0f,-9999.0f, +9999.0f, +9999.0f);
static ImVec4 GNullClipRect(-8192.0f, -8192.0f, +8192.0f, +8192.0f); // Large values that are easy to encode in a few bits+shift
void ImDrawList::Clear()
{
@ -98,7 +98,8 @@ void ImDrawList::Clear()
_ClipRectStack.resize(0);
_TextureIdStack.resize(0);
_Path.resize(0);
_ChannelCurrent = 0;
_ChannelsCurrent = 0;
_ChannelsCount = 1;
// NB: Do not clear channels so our allocations are re-used after the first frame.
}
@ -113,7 +114,8 @@ void ImDrawList::ClearFreeMemory()
_ClipRectStack.clear();
_TextureIdStack.clear();
_Path.clear();
_ChannelCurrent = 0;
_ChannelsCurrent = 0;
_ChannelsCount = 1;
for (int i = 0; i < _Channels.Size; i++)
{
if (i == 0) memset(&_Channels[0], 0, sizeof(_Channels[0])); // channel 0 is a copy of CmdBuffer/IdxBuffer, don't destruct again
@ -126,11 +128,8 @@ void ImDrawList::ClearFreeMemory()
void ImDrawList::AddDrawCmd()
{
ImDrawCmd draw_cmd;
draw_cmd.ElemCount = 0;
draw_cmd.ClipRect = _ClipRectStack.Size ? _ClipRectStack.back() : GNullClipRect;
draw_cmd.TextureId = _TextureIdStack.Size ? _TextureIdStack.back() : NULL;
draw_cmd.UserCallback = NULL;
draw_cmd.UserCallbackData = NULL;
IM_ASSERT(draw_cmd.ClipRect.x <= draw_cmd.ClipRect.z && draw_cmd.ClipRect.y <= draw_cmd.ClipRect.w);
CmdBuffer.push_back(draw_cmd);
@ -151,24 +150,34 @@ void ImDrawList::AddCallback(ImDrawCallback callback, void* callback_data)
AddDrawCmd();
}
void ImDrawList::ChannelsSplit(int channel_count)
void ImDrawList::ChannelsSplit(int channels_count)
{
IM_ASSERT(_ChannelCurrent == 0);
IM_ASSERT(_ChannelsCurrent == 0 && _ChannelsCount == 1);
int old_channels_count = _Channels.Size;
if (old_channels_count < channel_count)
_Channels.resize(channel_count);
for (int i = 0; i < channel_count; i++)
if (old_channels_count < channels_count)
_Channels.resize(channels_count);
_ChannelsCount = channels_count;
for (int i = 0; i < channels_count; i++)
{
if (i >= old_channels_count)
new(&_Channels[i]) ImDrawChannel();
else
else if (i > 0)
_Channels[i].CmdBuffer.resize(0), _Channels[i].IdxBuffer.resize(0);
if (_Channels[i].CmdBuffer.Size == 0)
{
ImDrawCmd draw_cmd;
draw_cmd.ClipRect = _ClipRectStack.back();
draw_cmd.TextureId = _TextureIdStack.back();
_Channels[i].CmdBuffer.push_back(draw_cmd);
}
}
}
void ImDrawList::ChannelsMerge(int channel_count)
void ImDrawList::ChannelsMerge()
{
// Note that we never use or rely on channels.Size because it is merely a buffer that we never shrink back to 0 to keep all sub-buffers ready for use.
// This is why this function takes 'channel_count' as a parameter of how many channels to merge (the user knows)
if (channel_count < 2)
if (_ChannelsCount <= 1)
return;
ChannelsSetCurrent(0);
@ -176,7 +185,7 @@ void ImDrawList::ChannelsMerge(int channel_count)
CmdBuffer.pop_back();
int new_cmd_buffer_count = 0, new_idx_buffer_count = 0;
for (int i = 1; i < channel_count; i++)
for (int i = 1; i < _ChannelsCount; i++)
{
ImDrawChannel& ch = _Channels[i];
if (ch.CmdBuffer.Size && ch.CmdBuffer.back().ElemCount == 0)
@ -189,23 +198,24 @@ void ImDrawList::ChannelsMerge(int channel_count)
ImDrawCmd* cmd_write = CmdBuffer.Data + CmdBuffer.Size - new_cmd_buffer_count;
_IdxWritePtr = IdxBuffer.Data + IdxBuffer.Size - new_idx_buffer_count;
for (int i = 1; i < channel_count; i++)
for (int i = 1; i < _ChannelsCount; 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(_IdxWritePtr, ch.IdxBuffer.Data, sz * sizeof(ImDrawIdx)); _IdxWritePtr += sz; }
}
AddDrawCmd();
_ChannelsCount = 1;
}
void ImDrawList::ChannelsSetCurrent(int idx)
{
if (_ChannelCurrent == idx) return;
memcpy(&_Channels.Data[_ChannelCurrent].CmdBuffer, &CmdBuffer, sizeof(CmdBuffer));
memcpy(&_Channels.Data[_ChannelCurrent].IdxBuffer, &IdxBuffer, sizeof(IdxBuffer));
_ChannelCurrent = idx;
memcpy(&CmdBuffer, &_Channels.Data[_ChannelCurrent].CmdBuffer, sizeof(CmdBuffer));
memcpy(&IdxBuffer, &_Channels.Data[_ChannelCurrent].IdxBuffer, sizeof(IdxBuffer));
if (_ChannelsCurrent == idx) return;
memcpy(&_Channels.Data[_ChannelsCurrent].CmdBuffer, &CmdBuffer, sizeof(CmdBuffer)); // copy 12 bytes, four times
memcpy(&_Channels.Data[_ChannelsCurrent].IdxBuffer, &IdxBuffer, sizeof(IdxBuffer));
_ChannelsCurrent = idx;
memcpy(&CmdBuffer, &_Channels.Data[_ChannelsCurrent].CmdBuffer, sizeof(CmdBuffer));
memcpy(&IdxBuffer, &_Channels.Data[_ChannelsCurrent].IdxBuffer, sizeof(IdxBuffer));
_IdxWritePtr = IdxBuffer.Data + IdxBuffer.Size;
}