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ImDrawList::AddCallback() allows for custom rendering (e.g. 3D scene inside a imgui widget))

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ocornut
2015-01-31 15:24:55 +00:00
parent 82666cdc57
commit 2ecc285919
2 changed files with 71 additions and 49 deletions
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66
imgui.cpp
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@ -6039,81 +6039,84 @@ void ImDrawList::Clear()
texture_id_stack.resize(0);
}
// This is useful if you need to force-create a new draw call (to allow for depending rendering / blending).
// Otherwise primitives are merged into the same draw-call as much as possible.
void ImDrawList::SplitDrawCmd()
void ImDrawList::AddDrawCmd()
{
ImDrawCmd draw_cmd;
draw_cmd.vtx_count = 0;
draw_cmd.clip_rect = clip_rect_stack.back();
draw_cmd.texture_id = texture_id_stack.back();
draw_cmd.clip_rect = clip_rect_stack.empty() ? GNullClipRect : clip_rect_stack.back();
draw_cmd.texture_id = texture_id_stack.empty() ? NULL : texture_id_stack.back();
draw_cmd.user_callback = NULL;
draw_cmd.user_callback_data = NULL;
commands.push_back(draw_cmd);
}
void ImDrawList::SetClipRect(const ImVec4& clip_rect)
void ImDrawList::AddCallback(ImDrawCallback callback, void* callback_data)
{
ImDrawCmd* current_cmd = commands.empty() ? NULL : &commands.back();
if (current_cmd && current_cmd->vtx_count == 0)
if (!current_cmd || current_cmd->vtx_count != 0 || current_cmd->user_callback != NULL)
{
// Reuse existing command (high-level clipping may have discarded vertices submitted earlier)
// FIXME-OPT: Possibly even reuse previous command.
current_cmd->clip_rect = clip_rect;
AddDrawCmd();
current_cmd = &commands.back();
}
current_cmd->user_callback = callback;
current_cmd->user_callback_data = callback_data;
// Force a new command after us
// We function this way so that the most common calls (AddLine, AddRect..) always have a command to add to without doing any check.
AddDrawCmd();
}
void ImDrawList::UpdateClipRect()
{
ImDrawCmd* current_cmd = commands.empty() ? NULL : &commands.back();
if (!current_cmd || (current_cmd->vtx_count != 0) || current_cmd->user_callback != NULL)
{
AddDrawCmd();
}
else
{
ImDrawCmd draw_cmd;
draw_cmd.vtx_count = 0;
draw_cmd.clip_rect = clip_rect;
draw_cmd.texture_id = texture_id_stack.back();
commands.push_back(draw_cmd);
current_cmd->clip_rect = clip_rect_stack.empty() ? GNullClipRect : clip_rect_stack.back();
}
}
void ImDrawList::PushClipRect(const ImVec4& clip_rect)
{
clip_rect_stack.push_back(clip_rect);
SetClipRect(clip_rect);
UpdateClipRect();
}
void ImDrawList::PopClipRect()
{
IM_ASSERT(clip_rect_stack.size() > 0);
clip_rect_stack.pop_back();
const ImVec4 clip_rect = clip_rect_stack.empty() ? GNullClipRect : clip_rect_stack.back();
SetClipRect(clip_rect);
UpdateClipRect();
}
void ImDrawList::SetTextureID(const ImTextureID& texture_id)
void ImDrawList::UpdateTextureID()
{
ImDrawCmd* current_cmd = commands.empty() ? NULL : &commands.back();
if (current_cmd && (current_cmd->vtx_count == 0 || current_cmd->texture_id == texture_id))
const ImTextureID texture_id = texture_id_stack.empty() ? NULL : texture_id_stack.back();
if (!current_cmd || (current_cmd->vtx_count != 0 && current_cmd->texture_id != texture_id) || current_cmd->user_callback != NULL)
{
// Reuse existing command
// FIXME-OPT: Possibly even reuse previous command.
current_cmd->texture_id = texture_id;
AddDrawCmd();
}
else
{
ImDrawCmd draw_cmd;
draw_cmd.vtx_count = 0;
draw_cmd.clip_rect = clip_rect_stack.empty() ? GNullClipRect: clip_rect_stack.back();
draw_cmd.texture_id = texture_id;
commands.push_back(draw_cmd);
current_cmd->texture_id = texture_id;
}
}
void ImDrawList::PushTextureID(const ImTextureID& texture_id)
{
texture_id_stack.push_back(texture_id);
SetTextureID(texture_id);
UpdateTextureID();
}
void ImDrawList::PopTextureID()
{
IM_ASSERT(texture_id_stack.size() > 0);
texture_id_stack.pop_back();
const ImTextureID texture_id = texture_id_stack.empty() ? NULL : texture_id_stack.back();
SetTextureID(texture_id);
UpdateTextureID();
}
void ImDrawList::ReserveVertices(unsigned int vtx_count)
@ -6143,6 +6146,7 @@ void ImDrawList::AddVtxUV(const ImVec2& pos, ImU32 col, const ImVec2& uv)
vtx_write++;
}
// NB: memory should be reserved for 6 vertices by the caller.
void ImDrawList::AddVtxLine(const ImVec2& a, const ImVec2& b, ImU32 col)
{
const float length = sqrtf(ImLengthSqr(b - a));