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Shadows: Added experimental texture-based shadows (stripped of dynamic tex config and back-end code)
(merged 10 commits, removing dynamic tex config, moved tex config to internal structs, removed back-end changes)
(squashed 2025-06-11, fixed conflict, doesn't build as-is)
Shadows: Added IMGUI_HAS_SHADOWS
Shadows: Demo code in Custom Rendering section. Added AddShadowRectFilled() variant. BeginMainMenuBar() disable shadows.
Shadows: Added initial version of convex shape shadow code.
(+stripped out of original polygon generation demo, moved to imgui_dev)
Shadows: Tweak demo to use AddShadowCircle() functions + fix warnings.
(+ stripped old polygon generation code from commits)
Shadows: Convex shape shadow improvement/fixes
- Fixed pixel cracking on convex shadow edges
- Added convex shadow offset support
- Fixed some convex shadow fringing issues
- Added convex shadow demo code
Shadows: Added ImDrawShadowFlags, simplified API surface, reordered parameters
+ fix minor warnings
+ removed NGon variant for now.
Shadows: Re-added AddShadowNGon().
Shadows: Shallow styling tweaks and renaming for consistency.
Shadows: Fixes + two fixes for PVS Studio static analyzer.
Shadows: Fix for latest, reuse ImDrawList, remove ImDrawShadowFlags.
Shadows: Fix to support for colored-only font atlas. (4202)
Shadows: Fix broken shadows due to zero-clear added in 9417acc2.
Shadows: remove use of GetWindowContentRegionMax().
Shadows: WIP fixes for latest. (broken UV caching)
Shadows: WIP for latest (refreshing UV coordinates).
This commit is contained in:
Ben Carter
ocornut
parent
6d910d5487
commit
aea4f38726
6 changed files with 1270 additions and 0 deletions
178
imgui_demo.cpp
178
imgui_demo.cpp
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@ -8626,6 +8626,22 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
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EndTabItem();
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}
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if (BeginTabItem("Shadows"))
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{
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Text("Window shadows:");
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ColorEdit4("Color", (float*)&style.Colors[ImGuiCol_WindowShadow], ImGuiColorEditFlags_AlphaBar);
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SameLine();
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HelpMarker("Same as 'WindowShadow' in Colors tab.");
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SliderFloat("Size", &style.WindowShadowSize, 0.0f, 128.0f, "%.1f");
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SameLine();
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HelpMarker("Set shadow size to zero to disable shadows.");
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SliderFloat("Offset distance", &style.WindowShadowOffsetDist, 0.0f, 64.0f, "%.0f");
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SliderAngle("Offset angle", &style.WindowShadowOffsetAngle);
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EndTabItem();
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}
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EndTabBar();
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}
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PopItemWidth();
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@ -10096,6 +10112,168 @@ static void ShowExampleAppCustomRendering(bool* p_open)
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ImGui::EndTabItem();
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}
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if (ImGui::BeginTabItem("Shadows"))
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{
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static float shadow_thickness = 40.0f;
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static ImVec4 shadow_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
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static bool shadow_filled = false;
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static ImVec4 shape_color = ImVec4(0.9f, 0.6f, 0.3f, 1.0f);
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static float shape_rounding = 0.0f;
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static ImVec2 shadow_offset(0.0f, 0.0f);
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static ImVec4 background_color = ImVec4(0.5f, 0.5f, 0.7f, 1.0f);
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static bool wireframe = false;
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static bool aa = true;
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static int poly_shape_index = 0;
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ImGui::Checkbox("Shadow filled", &shadow_filled);
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ImGui::SameLine();
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HelpMarker("This will fill the section behind the shape to shadow. It's often unnecessary and wasteful but provided for consistency.");
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ImGui::Checkbox("Wireframe shapes", &wireframe);
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ImGui::SameLine();
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HelpMarker("This draws the shapes in wireframe so you can see the shadow underneath.");
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ImGui::Checkbox("Anti-aliasing", &aa);
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ImGui::DragFloat("Shadow Thickness", &shadow_thickness, 1.0f, 0.0f, 100.0f, "%.02f");
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ImGui::SliderFloat2("Offset", (float*)&shadow_offset, -32.0f, 32.0f);
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ImGui::SameLine();
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HelpMarker("Note that currently circles/convex shapes do not support non-zero offsets for unfilled shadows.");
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ImGui::ColorEdit4("Background Color", &background_color.x);
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ImGui::ColorEdit4("Shadow Color", &shadow_color.x);
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ImGui::ColorEdit4("Shape Color", &shape_color.x);
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ImGui::DragFloat("Shape Rounding", &shape_rounding, 1.0f, 0.0f, 20.0f, "%.02f");
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ImGui::Combo("Convex shape", &poly_shape_index, "Shape 1\0Shape 2\0Shape 3\0Shape 4\0Shape 4 (winding reversed)");
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ImDrawList* draw_list = ImGui::GetWindowDrawList();
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ImDrawListFlags old_flags = draw_list->Flags;
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if (aa)
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draw_list->Flags |= ~ImDrawListFlags_AntiAliasedFill;
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else
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draw_list->Flags &= ~ImDrawListFlags_AntiAliasedFill;
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// Fill a strip of background
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{
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ImVec2 p = ImGui::GetCursorScreenPos();
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draw_list->AddRectFilled(p, ImVec2(p.x + ImGui::GetContentRegionAvail().x, p.y + 200.0f), ImGui::GetColorU32(background_color));
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}
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// Rectangle
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{
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ImVec2 p = ImGui::GetCursorScreenPos();
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ImGui::Dummy(ImVec2(200.0f, 200.0f));
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ImVec2 r1(p.x + 50.0f, p.y + 50.0f);
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ImVec2 r2(p.x + 150.0f, p.y + 150.0f);
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ImDrawFlags draw_flags = shadow_filled ? ImDrawFlags_None : ImDrawFlags_ShadowCutOutShapeBackground;
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draw_list->AddShadowRect(r1, r2, ImGui::GetColorU32(shadow_color), shadow_thickness, shadow_offset, draw_flags, shape_rounding);
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if (wireframe)
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draw_list->AddRect(r1, r2, ImGui::GetColorU32(shape_color), shape_rounding);
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else
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draw_list->AddRectFilled(r1, r2, ImGui::GetColorU32(shape_color), shape_rounding);
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}
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ImGui::SameLine();
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// Circle
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{
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ImVec2 p = ImGui::GetCursorScreenPos();
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ImGui::Dummy(ImVec2(200.0f, 200.0f));
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// FIXME-SHADOWS: Offset forced to zero when shadow is not filled because it isn't supported
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float off = 10.0f;
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ImVec2 r1(p.x + 50.0f + off, p.y + 50.0f + off);
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ImVec2 r2(p.x + 150.0f - off, p.y + 150.0f - off);
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ImVec2 center(p.x + 100.0f, p.y + 100.0f);
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ImDrawFlags draw_flags = shadow_filled ? ImDrawFlags_None : ImDrawFlags_ShadowCutOutShapeBackground;
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draw_list->AddShadowCircle(center, 50.0f, ImGui::GetColorU32(shadow_color), shadow_thickness, shadow_filled ? shadow_offset : ImVec2(0.0f, 0.0f), draw_flags, 0);
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if (wireframe)
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draw_list->AddCircle(center, 50.0f, ImGui::GetColorU32(shape_color), 0);
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else
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draw_list->AddCircleFilled(center, 50.0f, ImGui::GetColorU32(shape_color), 0);
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}
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ImGui::SameLine();
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// Convex shape
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{
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ImVec2 pos = ImGui::GetCursorScreenPos();
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ImGui::Dummy(ImVec2(200.0f, 200.0f));
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const ImVec2 poly_centre(pos.x + 50.0f, pos.y + 100.0f);
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ImVec2 poly_points[8];
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int poly_points_count = 0;
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switch (poly_shape_index)
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{
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default:
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case 0:
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{
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poly_points[0] = ImVec2(poly_centre.x - 32.0f, poly_centre.y);
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poly_points[1] = ImVec2(poly_centre.x - 24.0f, poly_centre.y + 24.0f);
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poly_points[2] = ImVec2(poly_centre.x, poly_centre.y + 32.0f);
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poly_points[3] = ImVec2(poly_centre.x + 24.0f, poly_centre.y + 24.0f);
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poly_points[4] = ImVec2(poly_centre.x + 32.0f, poly_centre.y);
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poly_points[5] = ImVec2(poly_centre.x + 24.0f, poly_centre.y - 24.0f);
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poly_points[6] = ImVec2(poly_centre.x, poly_centre.y - 32.0f);
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poly_points[7] = ImVec2(poly_centre.x - 32.0f, poly_centre.y - 32.0f);
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poly_points_count = 8;
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break;
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}
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case 1:
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{
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poly_points[0] = ImVec2(poly_centre.x + 40.0f, poly_centre.y - 20.0f);
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poly_points[1] = ImVec2(poly_centre.x, poly_centre.y + 32.0f);
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poly_points[2] = ImVec2(poly_centre.x - 24.0f, poly_centre.y - 32.0f);
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poly_points_count = 3;
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break;
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}
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case 2:
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{
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poly_points[0] = ImVec2(poly_centre.x - 32.0f, poly_centre.y);
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poly_points[1] = ImVec2(poly_centre.x, poly_centre.y + 32.0f);
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poly_points[2] = ImVec2(poly_centre.x + 32.0f, poly_centre.y);
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poly_points[3] = ImVec2(poly_centre.x, poly_centre.y - 32.0f);
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poly_points_count = 4;
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break;
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}
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case 3:
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{
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poly_points[0] = ImVec2(poly_centre.x - 4.0f, poly_centre.y - 20.0f);
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poly_points[1] = ImVec2(poly_centre.x + 12.0f, poly_centre.y + 2.0f);
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poly_points[2] = ImVec2(poly_centre.x + 8.0f, poly_centre.y + 16.0f);
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poly_points[3] = ImVec2(poly_centre.x, poly_centre.y + 32.0f);
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poly_points[4] = ImVec2(poly_centre.x - 16.0f, poly_centre.y - 32.0f);
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poly_points_count = 5;
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break;
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}
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case 4: // Same as test case 3 but with reversed winding
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{
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poly_points[0] = ImVec2(poly_centre.x - 16.0f, poly_centre.y - 32.0f);
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poly_points[1] = ImVec2(poly_centre.x, poly_centre.y + 32.0f);
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poly_points[2] = ImVec2(poly_centre.x + 8.0f, poly_centre.y + 16.0f);
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poly_points[3] = ImVec2(poly_centre.x + 12.0f, poly_centre.y + 2.0f);
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poly_points[4] = ImVec2(poly_centre.x - 4.0f, poly_centre.y - 20.0f);
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poly_points_count = 5;
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break;
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}
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}
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// FIXME-SHADOWS: Offset forced to zero when shadow is not filled because it isn't supported
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ImDrawFlags draw_flags = shadow_filled ? ImDrawFlags_None : ImDrawFlags_ShadowCutOutShapeBackground;
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draw_list->AddShadowConvexPoly(poly_points, poly_points_count, ImGui::GetColorU32(shadow_color), shadow_thickness, shadow_filled ? shadow_offset : ImVec2(0.0f, 0.0f), draw_flags);
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if (wireframe)
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draw_list->AddPolyline(poly_points, poly_points_count, ImGui::GetColorU32(shape_color), true, 1.0f);
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else
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draw_list->AddConvexPolyFilled(poly_points, poly_points_count, ImGui::GetColorU32(shape_color));
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}
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draw_list->Flags = old_flags;
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ImGui::EndTabItem();
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}
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if (ImGui::BeginTabItem("BG/FG draw lists"))
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{
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static bool draw_bg = true;
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