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Added area calculation for draw lists in metrics 

Added ability to hover over a draw list's summary stats and see all the contents in wireframe

(cherry picked from commit fd808347bd68a07ad318af6c151028bc9f7b82e7)
This commit is contained in:
Ben Carter 2019-11-22 20:22:03 +09:00 committed by omar
parent 0cb1c633ff
commit aeb57952d6
1 changed files with 60 additions and 5 deletions
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65
imgui.cpp
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@ -9768,7 +9768,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
if (window && !window->WasActive)
ImGui::Text("(Note: owning Window is inactive: DrawList is not being rendered!)");
int elem_offset = 0;
unsigned int elem_offset = 0;
for (const ImDrawCmd* pcmd = draw_list->CmdBuffer.begin(); pcmd < draw_list->CmdBuffer.end(); elem_offset += pcmd->ElemCount, pcmd++)
{
if (pcmd->UserCallback == NULL && pcmd->ElemCount == 0)
@ -9778,16 +9778,44 @@ void ImGui::ShowMetricsWindow(bool* p_open)
ImGui::BulletText("Callback %p, user_data %p", pcmd->UserCallback, pcmd->UserCallbackData);
continue;
}
ImDrawIdx* idx_buffer = (draw_list->IdxBuffer.Size > 0) ? draw_list->IdxBuffer.Data : NULL;
// Calculate approximate coverage area (touched pixel count)
// This will be in pixels squared as long there's no post-scaling happening to the ImGui output
// Optionally also draw all the polys in the list in wireframe when hovering over
float total_area = 0.0f;
for (unsigned int base_idx = elem_offset; base_idx < (elem_offset + pcmd->ElemCount); base_idx += 3)
{
ImVec2 triangles_pos[3];
for (int n = 0; n < 3; n++)
{
int vtx_i = idx_buffer ? idx_buffer[base_idx + n] : (base_idx + n);
ImDrawVert& v = draw_list->VtxBuffer[vtx_i];
triangles_pos[n] = v.pos;
}
// Calculate triangle area and accumulate
float area = abs((triangles_pos[0].x * (triangles_pos[1].y - triangles_pos[2].y)) +
(triangles_pos[1].x * (triangles_pos[2].y - triangles_pos[0].y)) +
(triangles_pos[2].x * (triangles_pos[0].y - triangles_pos[1].y))) * 0.5f;
total_area += area;
}
char buf[300];
ImFormatString(buf, IM_ARRAYSIZE(buf), "Draw %4d triangles, tex 0x%p, clip_rect (%4.0f,%4.0f)-(%4.0f,%4.0f)",
pcmd->ElemCount/3, (void*)(intptr_t)pcmd->TextureId, pcmd->ClipRect.x, pcmd->ClipRect.y, pcmd->ClipRect.z, pcmd->ClipRect.w);
ImFormatString(buf, IM_ARRAYSIZE(buf), "Draw %4d triangles, tex 0x%p, area %.0fpx^2, clip_rect (%4.0f,%4.0f)-(%4.0f,%4.0f)",
pcmd->ElemCount/3, (void*)(intptr_t)pcmd->TextureId, total_area,
pcmd->ClipRect.x, pcmd->ClipRect.y, pcmd->ClipRect.z, pcmd->ClipRect.w);
bool pcmd_node_open = ImGui::TreeNode((void*)(pcmd - draw_list->CmdBuffer.begin()), "%s", buf);
if (show_drawcmd_clip_rects && fg_draw_list && ImGui::IsItemHovered())
{
ImRect clip_rect = pcmd->ClipRect;
ImRect vtxs_rect;
for (int i = elem_offset; i < elem_offset + (int)pcmd->ElemCount; i++)
for (unsigned int i = elem_offset; i < elem_offset + (int)pcmd->ElemCount; i++)
vtxs_rect.Add(draw_list->VtxBuffer[idx_buffer ? idx_buffer[i] : i].pos);
clip_rect.Floor(); fg_draw_list->AddRect(clip_rect.Min, clip_rect.Max, IM_COL32(255,0,255,255));
vtxs_rect.Floor(); fg_draw_list->AddRect(vtxs_rect.Min, vtxs_rect.Max, IM_COL32(255,255,0,255));
@ -9795,8 +9823,34 @@ void ImGui::ShowMetricsWindow(bool* p_open)
if (!pcmd_node_open)
continue;
// Display vertex information summary. Hover to get all triangles drawn in wireframe
ImFormatString(buf, IM_ARRAYSIZE(buf), "ElemCount: %d, ElemCount/3: %d, VtxOffset: +%d, IdxOffset: +%d", pcmd->ElemCount, pcmd->ElemCount/3, pcmd->VtxOffset, pcmd->IdxOffset);
ImGui::Selectable(buf, false);
if (fg_draw_list && ImGui::IsItemHovered())
{
// Draw wireframe version of everything
ImDrawListFlags backup_flags = fg_draw_list->Flags;
fg_draw_list->Flags &= ~ImDrawListFlags_AntiAliasedLines; // Disable AA on triangle outlines at is more readable for very large and thin triangles.
for (unsigned int base_idx = elem_offset; base_idx < (elem_offset + pcmd->ElemCount); base_idx += 3)
{
ImVec2 triangles_pos[3];
for (int n = 0; n < 3; n++)
{
int vtx_i = idx_buffer ? idx_buffer[base_idx + n] : (base_idx + n);
ImDrawVert& v = draw_list->VtxBuffer[vtx_i];
triangles_pos[n] = v.pos;
}
fg_draw_list->AddPolyline(triangles_pos, 3, IM_COL32(255, 255, 0, 255), true, 1.0f);
}
fg_draw_list->Flags = backup_flags;
}
// Display individual triangles/vertices. Hover on to get the corresponding triangle highlighted.
ImGui::Text("ElemCount: %d, ElemCount/3: %d, VtxOffset: +%d, IdxOffset: +%d", pcmd->ElemCount, pcmd->ElemCount/3, pcmd->VtxOffset, pcmd->IdxOffset);
ImGuiListClipper clipper(pcmd->ElemCount/3); // Manually coarse clip our print out of individual vertices to save CPU, only items that may be visible.
while (clipper.Step())
for (int prim = clipper.DisplayStart, idx_i = elem_offset + clipper.DisplayStart*3; prim < clipper.DisplayEnd; prim++)
@ -9811,6 +9865,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
buf_p += ImFormatString(buf_p, buf_end - buf_p, "%s %04d: pos (%8.2f,%8.2f), uv (%.6f,%.6f), col %08X\n",
(n == 0) ? "elem" : " ", idx_i, v.pos.x, v.pos.y, v.uv.x, v.uv.y, v.col);
}
ImGui::Selectable(buf, false);
if (fg_draw_list && ImGui::IsItemHovered())
{