Engine & Game Library Interface Update

Engine/Src/Imp/CPP/Renderer/DebugDraw.cpp

@@ -0,0 +1,110 @@
+// IAEngine: 2D Game Engine by IA
+// Copyright (C) 2025 IASoft (PVT) LTD (oss@iasoft.dev)
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <IAEngine/Engine.hpp>
+#include <Renderer/Renderer.hpp>
+#include <Renderer/DebugDraw.hpp>
+
+#include <WorldManager.hpp>
+
+#include <backends/imgui_impl_sdl3.h>
+#include <backends/imgui_impl_sdlgpu3.h>
+
+namespace ia::iae
+{
+    EXTERN SDL_Window *g_windowHandle;
+
+    ImGuiIO g_imGUIIO{};
+
+    VOID DebugDraw::Initialize()
+    {
+        const auto mainScale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
+
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+        g_imGUIIO = ImGui::GetIO();
+        g_imGUIIO.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+        g_imGUIIO.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+
+        ImGui::StyleColorsClassic();
+
+        ImGuiStyle &style = ImGui::GetStyle();
+        style.ScaleAllSizes(mainScale);
+        style.FontScaleDpi = mainScale;
+
+        ImGui_ImplSDLGPU3_InitInfo initInfo{.Device = Renderer::GetDevice(),
+                                            .ColorTargetFormat =
+                                                Renderer::GetRenderTargetFormat(),
+                                            .PresentMode = SDL_GPU_PRESENTMODE_VSYNC};
+        ImGui_ImplSDL3_InitForSDLGPU(g_windowHandle);
+        ImGui_ImplSDLGPU3_Init(&initInfo);
+    }
+
+    VOID DebugDraw::Terminate()
+    {
+        ImGui_ImplSDL3_Shutdown();
+        ImGui_ImplSDLGPU3_Shutdown();
+        ImGui::DestroyContext();
+    }
+
+    VOID DebugDraw::Render()
+    {
+        ImGui_ImplSDLGPU3_NewFrame();
+        ImGui_ImplSDL3_NewFrame();
+        ImGui::NewFrame();
+
+        WorldManager::DebugDraw();
+
+        ImGui::Render();
+    }
+} // namespace ia::iae
+
+namespace ia::iae
+{
+    struct State
+    {
+        ImU32 ActiveColor{0xFFFFFFFF};
+        FLOAT32 ActiveStrokeWidth{1.0f};
+    } g_debugDrawState{};
+
+    VOID Engine::DebugDraw_SetColor(IN Color color)
+    {
+        g_debugDrawState.ActiveColor = IM_COL32(color.R, color.G, color.B, color.A);
+    }
+
+    VOID Engine::DebugDraw_StrokeWidth(IN FLOAT32 width)
+    {
+        g_debugDrawState.ActiveStrokeWidth = width;
+    }
+
+    VOID Engine::DebugDraw_Line(IN Vec2 from, IN Vec2 to)
+    {
+        const auto drawList = ImGui::GetForegroundDrawList();
+        drawList->AddLine(ImVec2(from.x, from.y), ImVec2(to.x, to.y), g_debugDrawState.ActiveColor, g_debugDrawState.ActiveStrokeWidth);
+    }
+
+    VOID Engine::DebugDraw_FillRect(IN Vec2 position, IN Vec2 size)
+    {
+        const auto drawList = ImGui::GetForegroundDrawList();
+        drawList->AddRectFilled(ImVec2(position.x, position.y), ImVec2(position.x + size.x, position.y + size.y), g_debugDrawState.ActiveColor);
+    }
+
+    VOID Engine::DebugDraw_StrokeRect(IN Vec2 position, IN Vec2 size)
+    {
+        const auto drawList = ImGui::GetForegroundDrawList();
+        drawList->AddRect(ImVec2(position.x, position.y), ImVec2(position.x + size.x, position.y + size.y), g_debugDrawState.ActiveColor, g_debugDrawState.ActiveStrokeWidth);
+    }
+} // namespace ia::iae