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Texture-based round corners: Store rounded corners in texture to use 1 quad per corner.

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This commit is contained in:
Francisco Demartino
2018-07-23 17:50:28 -03:00
committed by ocornut
parent b6b8f6634e
commit fbc6bce06b
5 changed files with 570 additions and 11 deletions
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109
imgui_demo.cpp
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@ -240,6 +240,113 @@ void ImGui::ShowUserGuide()
ImGui::Unindent();
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
static void GetVtxIdxDelta(ImDrawList* dl, int* vtx, int *idx)
{
static int vtx_n, idx_n;
static int vtx_o, idx_o;
vtx_n = dl->VtxBuffer.Size;
idx_n = dl->IdxBuffer.Size;
*vtx = vtx_n - vtx_o;
*idx = idx_n - idx_o;
vtx_o = vtx_n;
idx_o = idx_n;
}
static void TestTextureBasedRender()
{
ImGuiIO& io = ImGui::GetIO();
ImGui::TextUnformatted("Press SHIFT to toggle quads (hold to see them).");
ImGui::TextUnformatted(io.KeyShift ? "SHIFT ON -- Rasterized quad circle! w00t! OPTIMIZATION!"
: "SHIFT OFF -- Regular, boring circle with PathArcToFast.");
static float radius = io.Fonts->RoundCornersMaxSize * 0.5f;
ImGui::SliderFloat("radius", &radius, 0.0f, (float)io.Fonts->RoundCornersMaxSize, "%.0f");
ImGui::BeginGroup();
static int segments = 20;
ImGui::PushItemWidth(120);
ImGui::SliderInt("segments", &segments, 3, 100);
ImGui::PopItemWidth();
int vtx = 0;
int idx = 0;
ImDrawList* dl = ImGui::GetWindowDrawList();
{
ImGui::Button("##1", ImVec2(200, 200));
GetVtxIdxDelta(dl, &vtx, &idx);
ImVec2 min = ImGui::GetItemRectMin();
ImVec2 size = ImGui::GetItemRectSize();
dl->AddCircleFilled(ImVec2(min.x + size.x * 0.5f, min.y + size.y * 0.5f), radius, 0xFFFF00FF, segments);
GetVtxIdxDelta(dl, &vtx, &idx);
ImGui::Text("AddCircleFilled\n %d vtx, %d idx", vtx, idx);
}
{
ImGui::Button("##2", ImVec2(200, 200));
GetVtxIdxDelta(dl, &vtx, &idx);
ImVec2 min = ImGui::GetItemRectMin();
ImVec2 size = ImGui::GetItemRectSize();
dl->AddCircle(ImVec2(min.x + size.x * 0.5f, min.y + size.y * 0.5f), radius, 0xFFFF00FF, segments);
GetVtxIdxDelta(dl, &vtx, &idx);
ImGui::Text("AddCircle\n %d vtx, %d idx", vtx, idx);
}
ImGui::EndGroup();
ImGui::SameLine();
ImGui::BeginGroup();
static bool tl = true, tr = true, bl = true, br = true;
ImGui::Checkbox("TL", &tl);
ImGui::SameLine(0, 12);
ImGui::Checkbox("TR", &tr);
ImGui::SameLine(0, 12);
ImGui::Checkbox("BL", &bl);
ImGui::SameLine(0, 12);
ImGui::Checkbox("BR", &br);
ImDrawFlags flags = 0;
flags |= tl ? ImDrawFlags_RoundCornersTopLeft : 0;
flags |= tr ? ImDrawFlags_RoundCornersTopRight : 0;
flags |= bl ? ImDrawFlags_RoundCornersBottomLeft : 0;
flags |= br ? ImDrawFlags_RoundCornersBottomRight : 0;
if (flags == 0)
flags |= ImDrawFlags_RoundCornersNone;
{
ImGui::Button("", ImVec2(200, 200));
ImVec2 r_min = ImGui::GetItemRectMin();
ImVec2 r_max = ImGui::GetItemRectMax();
GetVtxIdxDelta(dl, &vtx, &idx);
dl->AddRectFilled(r_min, r_max, 0xFFFF00FF, radius, flags);
GetVtxIdxDelta(dl, &vtx, &idx);
ImGui::Text("AddRectFilled\n %d vtx, %d idx", vtx, idx);
}
{
ImGui::Button("", ImVec2(200, 200));
ImVec2 r_min = ImGui::GetItemRectMin();
ImVec2 r_max = ImGui::GetItemRectMax();
GetVtxIdxDelta(dl, &vtx, &idx);
dl->AddRect(r_min, r_max, 0xFFFF00FF, radius, flags);
GetVtxIdxDelta(dl, &vtx, &idx);
ImGui::Text("AddRect\n %d vtx, %d idx", vtx, idx);
}
ImGui::EndGroup();
ImGui::Separator();
ImFontAtlas* atlas = ImGui::GetIO().Fonts;
ImGui::Image(atlas->TexID, ImVec2((float)atlas->TexWidth, (float)atlas->TexHeight), ImVec2(0, 0), ImVec2(1, 1), ImColor(255, 255, 255, 255), ImColor(255, 255, 255, 128));
}
//-----------------------------------------------------------------------------
// [SECTION] Demo Window / ShowDemoWindow()
//-----------------------------------------------------------------------------
@ -409,6 +516,8 @@ void ImGui::ShowDemoWindow(bool* p_open)
ImGui::Text("dear imgui says hello. (%s)", IMGUI_VERSION);
ImGui::Spacing();
TestTextureBasedRender();
IMGUI_DEMO_MARKER("Help");
if (ImGui::CollapsingHeader("Help"))
{