Initial Cross Platform Work

include/pd/lithium/drawlist.hpp

@@ -0,0 +1,145 @@
+#pragma once
+
+/*
+MIT License
+
+Copyright (c) 2024 - 2025 tobid7
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+
+#include <pd/lithium/command.hpp>
+#include <pd/lithium/font.hpp>
+#include <pd/lithium/pd_p_api.hpp>
+
+namespace PD {
+namespace LI {
+class PD_LITHIUM_API DrawList : public SmartCtor<DrawList> {
+ public:
+  DrawList(Texture::Ref solid) {
+    WhitePixel = solid;
+    CurrentTex = solid;
+  }
+  ~DrawList() {}
+
+  Command::Ref PreGenerateCmd();
+  void AddCommand(Command::Ref v) { pDrawList.Add(v); }
+  void Clear() { pDrawList.Clear(); }
+
+  void SetFont(Font::Ref font) { pCurrentFont = font; }
+  void SetFontScale(float scale) { pFontScale = scale; }
+
+  void DrawSolid() { CurrentTex = WhitePixel; }
+  void DrawTexture(Texture::Ref tex) { CurrentTex = tex; }
+
+  // SECTION: Draw API //
+
+  void DrawRect(const fvec2& pos, const fvec2& size, u32 color,
+                int thickness = 1);
+  void DrawRectFilled(const fvec2& pos, const fvec2& size, u32 color);
+  void DrawTriangle(const fvec2& a, const fvec2& b, const fvec2& c, u32 color,
+                    int thickness = 1);
+  void DrawTriangleFilled(const fvec2& a, const fvec2& b, const fvec2& c,
+                          u32 color);
+  void DrawCircle(const fvec2& center, float rad, u32 color, int num_segments,
+                  int thickness = 1);
+  void DrawCircleFilled(const fvec2& center, float rad, u32 color,
+                        int num_segments);
+  void DrawText(const fvec2& p, const std::string& text, u32 color);
+
+  /**
+   * Take list of points and display it as a line on screen
+   * @param points List of Positions
+   * @param clr Color of the Line
+   * @param flags Additional Flags (Close for go back to starting point)
+   * @param thickness Thickness of the Line
+   */
+  void DrawPolyLine(const Vec<fvec2>& points, u32 clr, u32 flags = 0,
+                    int thickness = 1);
+  /**
+   * Take a List ofpoints and display it as Filled Shape
+   * @note Keep in mind to setup the list of points clockwise
+   * @param points List of Points
+   * @param clr Color of the shape
+   */
+  void DrawConvexPolyFilled(const Vec<fvec2>& points, u32 clr);
+
+  // SECTION: PATH API //
+
+  /**
+   * Function to reserve Memory to prevent overhead on
+   * pusing a lot of points with PathNext
+   * @param num_points Number of Positions you want to add
+   */
+  void PathReserve(size_t num_points) {
+    pPath.Reserve(pPath.Size() + num_points);
+  }
+  /**
+   * Clear current Path
+   * @note PathStroke and PathFill will automatically clear
+   */
+  void PathClear() { pPath.Clear(); }
+  /**
+   * Add a Point to the Path
+   * @note Keep in mind that this function is used for
+   * setting the starting point
+   * @param v Position to add
+   */
+  void PathAdd(const fvec2& v) { pPath.Add(v); }
+  /**
+   * Path Stroke Create Line from point to point
+   * @note For Primitives like Rect or Triangle mak sure to use
+   * UI7DrawFlags_Close to add a line back to the starting point
+   * @param clr Color od the line
+   * @param thickness Thickness of the line
+   * @param flags Additional Drawflags
+   */
+  void PathStroke(u32 clr, int thickness = 1, u32 flags = 0) {
+    DrawPolyLine(pPath, clr, flags, thickness);
+    pPath.Clear();
+  }
+  /**
+   * Fill a Path with a Color
+   * @note **IMPORTANT: ** Paths need to be setup clockwise
+   * to be rendered correctly
+   * @param clr Fill Color
+   */
+  void PathFill(u32 clr) {
+    DrawConvexPolyFilled(pPath, clr);
+    pPath.Clear();
+  }
+  void PathArcToN(const fvec2& c, float radius, float a_min, float a_max,
+                  int segments);
+  /// @brief Create a Path Rect (uses to Positions instead of Pos/Size)
+  /// @param a Top Left Position
+  /// @param b Bottom Right Position
+  /// @param rounding rounding
+  /// @param flags DrawFlags (for special rounding rules)
+  void PathRect(fvec2 a, fvec2 b, float rounding = 0.f, u32 flags = 0);
+
+  int Layer = 0;
+  float pFontScale = 0.7f;
+  Font::Ref pCurrentFont = nullptr;
+  Texture::Ref CurrentTex = nullptr;
+  Texture::Ref WhitePixel = nullptr;
+  PD::Vec<Command::Ref> pDrawList;
+  PD::Vec<fvec2> pPath;
+};
+}  // namespace LI
+}  // namespace PD