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Texture-based round corners: Refactoring and upgrades

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Changed texture-based rounded rectangle edges to draw using thin polygons
Rearranged data for texture-based rounded rectangles to reduce allocations and pre-calculate parametric coordinate
Made max texture-based corner size a constant
Added API for drawing n-gons
Added support in circle API to auto-calculate suitable segment count
This commit is contained in:
Ben Carter
2019-12-02 20:33:02 +09:00
committed by ocornut
parent a0ef8c9187
commit 8e97a4a724
5 changed files with 176 additions and 59 deletions
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43
imgui_demo.cpp
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@ -258,12 +258,7 @@ static void GetVtxIdxDelta(ImDrawList* dl, int* vtx, int *idx)
}
// https://github.com/ocornut/imgui/issues/1962
// FIXME-ROUNDCORNERS: Sizes aren't matching.
// FIXME-ROUNDCORNERS: Lift the RoundCornersMaxSize limitation, fallback on existing renderer.
// FIXME-ROUNDCORNERS: Work on reducing filtrate for stroked shapes (may need to trade some cpu/vtx to reduce fill-rate for e.g. simple stroked circle) > https://github.com/ocornut/imgui/issues/1962#issuecomment-411507917
// FIXME-ROUNDCORNERS: Figure out how to support multiple thickness, might hard-code common steps (1.0, 1.5, 2.0, 3.0), not super satisfactory but may be best
// FIXME-ROUNDCORNERS: AddCircle* API relying on num_segments may need rework, might obsolete this parameter, or make it 0 default and rely on automatic subdivision similar to style.CurveTessellationTol for Bezier
// FIXME-ROUNDCORNERS: Intentional "low segment count" shapes (e.g. hexagon) currently achieved with AddCircle may need a new API (AddNgon?)
static void TestTextureBasedRender()
{
ImGuiIO& io = ImGui::GetIO();
@ -273,10 +268,11 @@ static void TestTextureBasedRender()
ImGui::Text("Hold SHIFT to toggle (%s)", io.KeyShift ? "SHIFT ON -- Using textures." : "SHIFT OFF -- Old method.");
static float radius = io.Fonts->RoundCornersMaxSize * 0.5f;
static float radius = 16.0f; // ImFontAtlasRoundCornersMaxSize * 0.5f;
static int segments = 20;
static int ngon_segments = 6;
ImGui::SliderFloat("radius", &radius, 0.0f, (float)io.Fonts->RoundCornersMaxSize, "%.0f");
ImGui::SliderFloat("radius", &radius, 0.0f, (float)64 /*ImFontAtlasRoundCornersMaxSize*/, "%.0f");
int vtx_n = 0;
int idx_n = 0;
@ -286,7 +282,7 @@ static void TestTextureBasedRender()
ImGui::BeginGroup();
ImGui::PushItemWidth(120);
ImGui::SliderInt("segments", &segments, 3, 100);
ImGui::SliderInt("segments", &segments, 0, 100);
ImGui::PopItemWidth();
{
@ -347,6 +343,37 @@ static void TestTextureBasedRender()
ImGui::EndGroup();
}
ImGui::SameLine();
{
ImGui::BeginGroup();
ImGui::PushItemWidth(120);
ImGui::SliderInt("ngon_segments", &ngon_segments, 3, 16);
ImGui::PopItemWidth();
{
ImGui::Button("##3", ImVec2(200, 200));
GetVtxIdxDelta(draw_list, &vtx_n, &idx_n);
ImVec2 min = ImGui::GetItemRectMin();
ImVec2 size = ImGui::GetItemRectSize();
draw_list->AddNgonFilled(ImVec2(min.x + size.x * 0.5f, min.y + size.y * 0.5f), radius, IM_COL32(255, 0, 255, 255), ngon_segments);
GetVtxIdxDelta(draw_list, &vtx_n, &idx_n);
ImGui::Text("AddNgonFilled\n %d vtx, %d idx", vtx_n, idx_n);
}
{
ImGui::Button("##4", ImVec2(200, 200));
GetVtxIdxDelta(draw_list, &vtx_n, &idx_n);
ImVec2 min = ImGui::GetItemRectMin();
ImVec2 size = ImGui::GetItemRectSize();
draw_list->AddNgon(ImVec2(min.x + size.x * 0.5f, min.y + size.y * 0.5f), radius, IM_COL32(255, 0, 255, 255), ngon_segments);
GetVtxIdxDelta(draw_list, &vtx_n, &idx_n);
ImGui::Text("AddNgon\n %d vtx, %d idx", vtx_n, idx_n);
}
ImGui::EndGroup();
}
ImGui::Separator();
ImGui::Text("Style");