feat&wip: Math API for CG, WiP HAL Paging API.

	- NOTE: HAL Paging API is still in wip, issues have to be fixed.
	- Moved WM code to corecg driver.

Signed-off-by: Amlal <amlal@el-mahrouss-logic.com>

3 files changed, 280 insertions, 0 deletions

diff --git a/dev/corecg/corecg.hxx b/dev/corecg/corecg.hxx
new file mode 100644
index 00000000..7549dbe9
--- /dev/null
+++ b/dev/corecg/corecg.hxx
@@ -0,0 +1,239 @@
+/* -------------------------------------------
+
+	Copyright ZKA Technologies.
+
+------------------------------------------- */
+
+#pragma once
+
+#include <Modules/CoreCG/DesktopRenderer.hxx>
+
+namespace CG::WM
+{
+	struct CG_WINDOW_STRUCT;
+
+	enum
+	{
+		cWndFlagNoShow			   = 0x02,
+		cWndFlagButton			   = 0x04,
+		cWndFlagWindow			   = 0x06,
+		cWndFlagButtonSelect	   = 0x08,
+		cWndFlagNoCloseButton	   = 0x010,
+		cWndFlagCloseButton		   = 0x012,
+		cWndFlagSelectBox		   = 0x014,
+		cWndFlagInputBox		   = 0x016,
+		cWndFlagCheckBoxFirstState = 0x018,
+		cWndFlagCheckBoxTwoState   = 0x018,
+		cWndFlagCheckBoxThreeState = 0x018,
+	};
+
+	struct CG_WINDOW_STRUCT final
+	{
+		static constexpr auto cChildElementCount = 4096;
+
+		Char					 w_window_name[255]{0};
+		Char					 w_class_name[255]{0};
+		Int32					 w_type{0};
+		Int32					 w_sub_type{0};
+		Int32					 w_x{0};
+		Int32					 w_y{0};
+		Int32					 w_w{0};
+		Int32					 w_h{0};
+		Size					 w_child_count{0};
+		struct CG_WINDOW_STRUCT* w_child_list[cChildElementCount]{0};
+		struct CG_WINDOW_STRUCT* w_parent_wnd{nullptr};
+		UInt32*					 w_canvas{nullptr};
+		Bool					 w_needs_repaint{false};
+	};
+
+	typedef struct CG_WINDOW_STRUCT CG_WINDOW_STRUCT;
+
+	inline struct CG_WINDOW_STRUCT* CGCreateWindow(Int32 kind, const Char* window_name, const Char* class_name, Int32 x, Int32 y, Int32 width, Int32 height, CG_WINDOW_STRUCT* parent = nullptr)
+	{
+		CG_WINDOW_STRUCT* wnd = new CG_WINDOW_STRUCT();
+
+		if (!wnd)
+		{
+			ErrLocal() = kErrorHeapOutOfMemory;
+			return nullptr;
+		}
+
+		rt_copy_memory((VoidPtr)window_name, wnd->w_window_name, rt_string_len(window_name));
+		rt_copy_memory((VoidPtr)class_name, wnd->w_class_name, rt_string_len(class_name));
+
+		if (parent)
+		{
+			wnd->w_parent_wnd = parent;
+
+			++wnd->w_parent_wnd->w_child_count;
+			wnd->w_parent_wnd->w_child_list[wnd->w_parent_wnd->w_child_count - 1] = wnd;
+		}
+
+		wnd->w_sub_type = 0;
+		wnd->w_type		= kind;
+		wnd->w_x		= x;
+		wnd->w_y		= y;
+
+		wnd->w_w = width;
+		wnd->w_h = height;
+
+		wnd->w_canvas = new UInt32[width * height];
+		rt_set_memory(wnd->w_canvas, CGColor(0xF5, 0xF5, 0xF5), width * height);
+
+		return wnd;
+	}
+
+	/// \brief Destroys a window and it's contents.
+	inline Bool CGDestroyWindow(struct CG_WINDOW_STRUCT* wnd)
+	{
+		if (wnd)
+		{
+			if (!mm_is_valid_heap(wnd))
+			{
+				wnd = nullptr;
+				return true;
+			}
+
+			wnd->w_needs_repaint = No;
+
+			for (SizeT index = 0UL; index < wnd->w_child_count; ++index)
+			{
+				CGDestroyWindow(wnd->w_child_list[index]);
+			}
+
+			delete wnd;
+			wnd = nullptr;
+
+			return true;
+		}
+
+		return false;
+	}
+
+	inline Kernel::Void CGDrawStringToWnd(CG_WINDOW_STRUCT* wnd, const Kernel::Char* text, Kernel::Int32 y_dst, Kernel::Int32 x_dst, Kernel::Int32 color)
+	{
+		y_dst += wnd->w_y + FLATCONTROLS_HEIGHT;
+		x_dst += wnd->w_x;
+
+		if (y_dst > (wnd->w_h + wnd->w_y))
+			return;
+
+		for (Kernel::SizeT i = 0; text[i] != 0; ++i)
+		{
+			if (x_dst > (wnd->w_w + wnd->w_x))
+				break;
+
+			CGRenderStringFromBitMap(&cFontBitmap[text[i]][0], FONT_SIZE_X, FONT_SIZE_Y, y_dst, x_dst, color);
+			x_dst += FONT_SIZE_Y;
+		}
+	}
+
+	inline SizeT CGDrawWindowList(CG_WINDOW_STRUCT** wnd, SizeT wnd_cnt)
+	{
+		if (wnd_cnt == 0 ||
+			!wnd)
+			return 0;
+
+		SizeT cnt = 0;
+
+		for (SizeT index = 0; index < wnd_cnt; ++index)
+		{
+			if (!wnd[index] ||
+				(wnd[index]->w_type == cWndFlagNoShow) ||
+				!wnd[index]->w_needs_repaint)
+				continue;
+
+			CGInit();
+
+			wnd[index]->w_needs_repaint = false;
+
+			if (CGAccessibilty::The().Width() < wnd[index]->w_x)
+			{
+				if ((wnd[index]->w_x - CGAccessibilty::The().Width()) > 1)
+				{
+					wnd[index]->w_x -= wnd[index]->w_x - CGAccessibilty::The().Width();
+				}
+				else
+				{
+					wnd[index]->w_x = 0;
+				}
+			}
+
+			if (CGAccessibilty::The().Height() < wnd[index]->w_y)
+			{
+				if ((wnd[index]->w_y - CGAccessibilty::The().Height()) > 1)
+				{
+					wnd[index]->w_y -= wnd[index]->w_y - CGAccessibilty::The().Width();
+				}
+				else
+				{
+					wnd[index]->w_y = 0;
+				}
+			}
+
+			++cnt;
+
+			// Draw fake controls, just for the looks of it (WINDOW ONLY)
+			if (wnd[index]->w_type == cWndFlagWindow)
+			{
+				CGDrawBitMapInRegion(wnd[index]->w_canvas, wnd[index]->w_h, wnd[index]->w_w, wnd[index]->w_y, wnd[index]->w_x);
+				CGDrawInRegion(CGColor(0xFF, 0xFF, 0xFF), wnd[index]->w_w, FLATCONTROLS_HEIGHT, wnd[index]->w_y, wnd[index]->w_x);
+
+				if (wnd[index]->w_sub_type != cWndFlagNoCloseButton)
+				{
+					if (wnd[index]->w_sub_type == cWndFlagCloseButton)
+					{
+						CGDrawBitMapInRegion(FlatControlsClose, FLATCONTROLS_CLOSE_HEIGHT, FLATCONTROLS_CLOSE_WIDTH, wnd[index]->w_y, wnd[index]->w_x + wnd[index]->w_w - FLATCONTROLS_WIDTH);
+					}
+					else
+					{
+						CGDrawBitMapInRegion(FlatControls, FLATCONTROLS_HEIGHT, FLATCONTROLS_WIDTH, wnd[index]->w_y, wnd[index]->w_x + wnd[index]->w_w - FLATCONTROLS_WIDTH);
+					}
+				}
+
+				CGDrawString(wnd[index]->w_window_name, wnd[index]->w_y + 8, wnd[index]->w_x + 8, CGColor(0x00, 0x00, 0x00));
+			}
+			/// @note buttons in this library are dynamic, it's because we want to avoid as much as computations as possible.
+			/// (Such as getting the middle coordinates of a button, to center the text.)
+			else if (wnd[index]->w_type == cWndFlagButtonSelect)
+			{
+				auto x_center = wnd[index]->w_x + 6;
+				auto y_center = wnd[index]->w_y + 7;
+
+				CGDrawInRegion(CGColor(0xD3, 0x74, 0x00), wnd[index]->w_w + 1, wnd[index]->w_h + 1, wnd[index]->w_y, wnd[index]->w_x);
+				CGDrawInRegion(CGColor(0xFF, 0xFF, 0xFF), wnd[index]->w_w - 1, wnd[index]->w_h - 1, wnd[index]->w_y + 1, wnd[index]->w_x + 1);
+				CGDrawStringToWnd(wnd[index], wnd[index]->w_window_name, y_center, x_center, CGColor(0x00, 0x00, 0x00));
+			}
+			else if (wnd[index]->w_type == cWndFlagButton)
+			{
+				auto x_center = wnd[index]->w_x + 6;
+				auto y_center = wnd[index]->w_y + 7;
+
+				CGDrawInRegion(CGColor(0xDC, 0xDC, 0xDC), wnd[index]->w_w + 1, wnd[index]->w_h + 1, wnd[index]->w_y, wnd[index]->w_x);
+				CGDrawInRegion(CGColor(0xFF, 0xFF, 0xFF), wnd[index]->w_w - 1, wnd[index]->w_h - 1, wnd[index]->w_y + 1, wnd[index]->w_x + 1);
+				CGDrawString(wnd[index]->w_window_name, y_center, x_center, CGColor(0x00, 0x00, 0x00));
+			}
+
+			CGFini();
+
+			// draw child windows and controls.
+			// doesn't have to be a window, enabling then windows in windows.
+
+			for (SizeT child = 0; child < wnd[index]->w_child_count; ++child)
+			{
+				wnd[index]->w_child_list[child]->w_x += wnd[index]->w_x;
+				wnd[index]->w_child_list[child]->w_y += wnd[index]->w_y + FLATCONTROLS_HEIGHT;
+
+				if ((wnd[index]->w_child_list[child]->w_w + wnd[index]->w_child_list[child]->w_x) > (wnd[index]->w_x + wnd[index]->w_w) ||
+					(wnd[index]->w_child_list[child]->w_h + wnd[index]->w_child_list[child]->w_y) > (wnd[index]->w_y + wnd[index]->w_h))
+					continue;
+
+				CGDrawWindowList(&wnd[index]->w_child_list[child], 1);
+			}
+
+			CGFini();
+		}
+
+		return cnt;
+	}
+} // namespace CG::WM
diff --git a/dev/corecg/corecg.json b/dev/corecg/corecg.json
new file mode 100644
index 00000000..e7f5c216
--- /dev/null
+++ b/dev/corecg/corecg.json
@@ -0,0 +1,23 @@
+{
+  "compiler_path": "x86_64-w64-mingw32-g++",
+  "compiler_std": "c++20",
+  "headers_path": ["../", "../zka"],
+  "sources_path": ["src/*.cxx"],
+  "output_name": "corecg.sys",
+  "compiler_flags": [
+    "-fPIC",
+    "-ffreestanding",
+    "-shared",
+    "-fno-rtti",
+    "-fno-exceptions",
+    "-Wl,--subsystem=17"
+  ],
+  "cpp_macros": [
+    "__CORECG_IMPL__",
+    "__NEWOSKRNL__",
+    "__ZKA_AMD64__",
+    "cCoreCGVersion=0x0100",
+    "cCoreCGVersionHighest=0x0100",
+    "cCoreCGVersionLowest=0x0100"
+  ]
+}
diff --git a/dev/corecg/src/corecg.cxx b/dev/corecg/src/corecg.cxx
new file mode 100644
index 00000000..7158ea62
--- /dev/null
+++ b/dev/corecg/src/corecg.cxx
@@ -0,0 +1,18 @@
+/* -------------------------------------------
+
+	Copyright ZKA Technologies.
+
+	FILE: corecg.cxx
+	PURPOSE: CoreCG Window Manager entrypoint.
+
+------------------------------------------- */
+
+#include <corecg/corecg.hxx>
+
+/** @brief CoreCG main, ZWM acts a proxy to the Installed GPU Driver. */
+CG::Int32 ModuleMain(CG::Void)
+{
+    CG::CGDrawDesktopBackground();
+
+	return 0;
+}