Day 3 complete

handmade-hero-notes

@@ -1 +1 @@
-Subproject commit 6b43c05d4800c498eb3c9b24e976f9a7eddf3301
+Subproject commit b67ab2734f4146a2a4bb9c3894d075cf1fe2c2cb

project/gen/handmade_gen.cpp

@@ -12,7 +12,7 @@ int gen_main()
 	log_fmt("Generating code for Handmade Hero\n");
 
 	log_fmt("Generaton finished for Handmade Hero\n");
-	gen::deinit();
+	// gen::deinit();
 	return 0;
 }
 #endif

project/handmade_win32.cpp

@@ -13,11 +13,66 @@
 #include "types.h"
 
 #include "win32.h"
-// using namespace win32;
+NS_WIN32_BEGIN
 
-// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nc-winuser-wndproc
+// TODO(Ed) : This is a global for now.
-// https://learn.microsoft.com/en-us/windows/win32/winmsg/about-messages-and-message-queues#system-defined-messages
+global bool       Running;
-LRESULT CALLBACK MainWindowCallback(
+
+global BITMAPINFO ScreenBitmapInfo;
+global void*      ScreenBitmapMemory; // Lets use directly mess with the "pixel's memory buffer"
+global HBITMAP    ScreenBitmapHandle;
+global HDC        ScreenDeviceContext;
+
+internal void
+resize_dib_section( u32 width, u32 height )
+{
+	// TODO(Ed) : Bulletproof memory handling here for the bitmap memory
+
+	// TODO(Ed) : Free DIB section
+
+	if ( ScreenBitmapHandle )
+	{
+		DeleteObject( ScreenBitmapHandle );
+	}
+	if ( ! ScreenDeviceContext )
+	{
+		ScreenDeviceContext = CreateCompatibleDC( 0 );
+	}
+
+	constexpr BITMAPINFOHEADER& header = ScreenBitmapInfo.bmiHeader;
+	header.biSize          = sizeof( header );
+	header.biWidth         = width;
+	header.biHeight        = height;
+	header.biPlanes        = 1;
+	header.biBitCount      = 32; // Need 24, but want 32 ( alignment )
+	header.biCompression   = BI_RGB_Uncompressed;
+	header.biSizeImage     = 0;
+	header.biXPelsPerMeter = 0;
+	header.biYPelsPerMeter = 0;
+	header.biClrUsed	   = 0;
+	header.biClrImportant  = 0;
+	ScreenBitmapHandle = CreateDIBSection( ScreenDeviceContext, & ScreenBitmapInfo
+		, DIB_ColorTable_RGB, & ScreenBitmapMemory
+		// Ignoring these last two
+		, 0, 0 );
+
+	// ReleaseContext( 0, ScreenDeviceContext );
+}
+
+internal void
+update_window( HDC device_context
+	, u32 x, u32 y
+	, u32 width, u32 height )
+{
+	StretchDIBits( device_context
+		, x, y, width, height
+		, x, y, width, height
+		, ScreenBitmapMemory, & ScreenBitmapInfo
+		, DIB_ColorTable_RGB, RO_Source_To_Dest );
+}
+
+LRESULT CALLBACK
+main_window_callback(
 	HWND   handle,
 	UINT   system_messages,
 	WPARAM w_param,
@@ -26,7 +81,6 @@ LRESULT CALLBACK MainWindowCallback(
 {
 	LRESULT result;
 
-	// https://learn.microsoft.com/en-us/windows/win32/winmsg/window-notifications
 	switch ( system_messages )
 	{
 		case WM_ACTIVATEAPP:
@@ -37,13 +91,15 @@ LRESULT CALLBACK MainWindowCallback(
 
 		case WM_CLOSE:
 		{
-			OutputDebugStringA( "WM_CLOSE\n" );
+			// TODO(Ed) : Handle with a message to the user
+			Running = false;
 		}
 		break;
 
 		case WM_DESTROY:
 		{
-			OutputDebugStringA( "WM_DESTROY\n" );
+			// TODO(Ed) : Handle with as an error and recreate the window
+			Running = false;
 		}
 		break;
 
@@ -52,21 +108,15 @@ LRESULT CALLBACK MainWindowCallback(
 			PAINTSTRUCT info;
 			HDC device_context = BeginPaint( handle, & info );
 
+
 			u32 x 	   = info.rcPaint.left;
 			u32 y 	   = info.rcPaint.top;
 			u32 height = info.rcPaint.bottom - info.rcPaint.top;
 			u32 width  = info.rcPaint.right  - info.rcPaint.left;
 
-			global DWORD operation = RO_Whiteness;
+			update_window( handle
-
-			PatBlt( device_context
 				, x, y
-				, width, height
+				, width, height );
-				, operation );
-
-			operation == RO_Whiteness ?
-				operation = RO_Blackness
-			:	operation = RO_Whiteness;
 
 			EndPaint( handle, & info );
 		}
@@ -74,6 +124,13 @@ LRESULT CALLBACK MainWindowCallback(
 
 		case WM_SIZE:
 		{
+			RECT client_rect;
+			GetClientRect( handle, & client_rect );
+
+			u32 width  = client_rect.right  - client_rect.left;
+			u32 height = client_rect.bottom - client_rect.top;
+
+			resize_dib_section( width, height );
 			OutputDebugStringA( "WM_SIZE\n" );
 		}
 		break;
@@ -87,23 +144,22 @@ LRESULT CALLBACK MainWindowCallback(
 
 	return result;
 }
+NS_WIN32_END
 
-int CALLBACK WinMain(
+int CALLBACK
+WinMain(
 	HINSTANCE instance,
 	HINSTANCE prev_instance,
 	LPSTR     commandline,
 	int       show_command
 )
 {
-	// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-messagebox
+	using namespace win32;
-	// MessageBox( 0, L"First message!", L"Handmade Hero", MB_Ok_Btn | MB_Icon_Information );
+	MessageBox( 0, L"First message!", L"Handmade Hero", MB_Ok_Btn | MB_Icon_Information );
 
-	// https://en.wikibooks.org/wiki/Windows_Programming/Window_Creation
-	// https://learn.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-wndclassa
 	WNDCLASS window_class {};
-		// window_class.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
 		window_class.style = CS_Own_Device_Context | CS_Horizontal_Redraw | CS_Vertical_Redraw;
-		window_class.lpfnWndProc = MainWindowCallback;
+		window_class.lpfnWndProc = main_window_callback;
 		// window_class.cbClsExtra  = ;
 		// window_class.cbWndExtra  = ;
 		window_class.hInstance   = instance;
@@ -115,13 +171,10 @@ int CALLBACK WinMain(
 
 	if ( RegisterClassW( &window_class ) )
 	{
-		// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-createwindowexa
-		// https://learn.microsoft.com/en-us/windows/win32/winmsg/window-styles
 		HWND window_handle = CreateWindowExW(
 			0,
 			window_class.lpszClassName,
 			L"Handmade Hero",
-			// WS_OVERLAPPEDWINDOW | WS_VISIBLE,
 			WS_Overlapped_Window | WS_Initially_Visible,
 			CW_USEDEFAULT, CW_USEDEFAULT, // x, y
 			CW_USEDEFAULT, CW_USEDEFAULT, // width, height
@@ -131,25 +184,16 @@ int CALLBACK WinMain(
 
 		if ( window_handle )
 		{
-			// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-showwindow
+			Running = true;
-			// ShowWindow( window_handle, show_command );
 
-			// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-updatewindow
-			// UpdateWindow( window_handle );
-
-			// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getmessage
 			MSG message;
-			for (;;)
+			while( Running )
 			{
 				BOOL msg_result = GetMessage( & message, 0, 0, 0 );
 				if ( msg_result > 0 )
 				{
-					// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-translatemessage
 					TranslateMessage( & message );
-
-					// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-dispatchmessage
 					DispatchMessage( & message );
-					// break;
 				}
 				else
 				{

project/platform/macros.h

@@ -3,3 +3,5 @@
 #define global        static    // Global variables
 #define internal      static    // Internal linkage
 #define local_persist static    // Local Persisting variables
+
+#define api_c extern "C"

project/platform/win32.h

@@ -10,19 +10,104 @@ Alternative header for windows.h
 // #endif
 
 #if Build_DLL
-#	define WIN_LIBRARY_API extern "C" __declspec(dllexport)
+#	define WIN_LIBRARY_API_START extern "C" __declspec(dllexport)
+#	define WIN_LIBRARY_API_END
 #else
-#	define WIN_LIBRARY_API extern "C"
+#	define WIN_LIBRARY_API_START extern "C" {
+#	define WIN_LIBRARY_API_END }
 #endif
 
 #ifndef CONST
 #	define CONST const
 #endif
 
-#define WM_ACTIVATEAPP 0x001C
+#define NS_WIN32_BEGIN namespace win32 {
+#define NS_WIN32_END }
 
+NS_WIN32_BEGIN
+WIN_LIBRARY_API_START
 
-// namespace win32 {
+#pragma region Gdi32
+
+#define _SAL_nop_impl_                      X
+#define _Deref_post2_impl_(p1,p2)
+#define _SAL2_Source_(Name, args, annotes) _SA_annotes3(SAL_name, #Name, "", "2") _Group_(annotes _SAL_nop_impl_)
+#define _Outptr_result_bytebuffer_(size)   _SAL2_Source_(_Outptr_result_bytebuffer_, (size), _Out_impl_ _Deref_post2_impl_(__notnull_impl_notref, __bytecap_impl(size)))
+
+DECLARE_HANDLE(HBITMAP);
+
+typedef struct tagBITMAPINFOHEADER{
+        DWORD      biSize;
+        LONG       biWidth;
+        LONG       biHeight;
+        WORD       biPlanes;
+        WORD       biBitCount;
+        DWORD      biCompression;
+        DWORD      biSizeImage;
+        LONG       biXPelsPerMeter;
+        LONG       biYPelsPerMeter;
+        DWORD      biClrUsed;
+        DWORD      biClrImportant;
+} BITMAPINFOHEADER, *LPBITMAPINFOHEADER, *PBITMAPINFOHEADER;
+
+typedef struct tagRGBQUAD {
+        BYTE    rgbBlue;
+        BYTE    rgbGreen;
+        BYTE    rgbRed;
+        BYTE    rgbReserved;
+} RGBQUAD;
+
+typedef struct tagBITMAPINFO {
+    BITMAPINFOHEADER    bmiHeader;
+    RGBQUAD             bmiColors[1];
+} BITMAPINFO, *LPBITMAPINFO, *PBITMAPINFO;
+
+#define GDI_DIBSIZE(bi) ((bi).biHeight < 0 ? (-1)*(GDI__DIBSIZE(bi)) : GDI__DIBSIZE(bi))
+
+HDC WINAPI CreateCompatibleDC( HDC hdc);
+
+HBITMAP WINAPI
+CreateDIBSection(
+    HDC               hdc,
+    CONST BITMAPINFO *pbmi,
+    UINT              usage,
+    _When_((pbmi->bmiHeader.biBitCount != 0), _Outptr_result_bytebuffer_(_Inexpressible_(GDI_DIBSIZE((pbmi->bmiHeader)))))
+    _When_((pbmi->bmiHeader.biBitCount == 0), _Outptr_result_bytebuffer_((pbmi->bmiHeader).biSizeImage))
+    VOID            **ppvBits,
+    HANDLE            hSection,
+    DWORD             offset
+);
+
+typedef HANDLE HGDIOBJ;
+BOOL WINAPI DeleteObject( HGDIOBJ ho);
+
+int WINAPI StretchDIBits( HDC hdc
+	, int xDest, int yDest, int DestWidth, int DestHeight
+	, int xSrc,  int ySrc,  int SrcWidth,  int SrcHeight,
+    CONST VOID* lpBits, CONST BITMAPINFO* lpbmi
+	, UINT iUsage, DWORD rop );
+
+typedef struct tagPAINTSTRUCT {
+    HDC         hdc;
+    BOOL        fErase;
+    RECT        rcPaint;
+    BOOL        fRestore;
+    BOOL        fIncUpdate;
+    BYTE        rgbReserved[32];
+} PAINTSTRUCT, *PPAINTSTRUCT, *NPPAINTSTRUCT, *LPPAINTSTRUCT;
+
+HDC WINAPI
+BeginPaint( HWND hWnd, LPPAINTSTRUCT lpPaint );
+
+BOOL WINAPI
+EndPaint( HWND hWnd, CONST PAINTSTRUCT *lpPaint );
+
+BOOL WINAPI
+PatBlt( HDC hdc
+	, int x, int y
+	, int w, int h
+	, DWORD rop );
+#pragma endregion Gdi32
 
 #ifdef UNICODE
 	constexpr auto CreateWindowEx = CreateWindowExW;
@@ -45,12 +130,14 @@ Alternative header for windows.h
 #pragma region Message Function Templates
 // From WinUser.h, modular headers lib doesn't have.
 
-WIN_LIBRARY_API BOOL WINAPI GetMessageA(
+BOOL WINAPI
+GetMessageA(
     LPMSG lpMsg,
     HWND hWnd,
     UINT wMsgFilterMin,
     UINT wMsgFilterMax);
-WIN_LIBRARY_API BOOL WINAPI GetMessageW(
+BOOL WINAPI
+GetMessageW(
     LPMSG lpMsg,
     HWND hWnd,
     UINT wMsgFilterMin,
@@ -74,29 +161,17 @@ WIN_LIBRARY_API BOOL WINAPI GetMessageW(
 #endif // !UNICODE
 #pragma endregion Message Function Templates
 
-#pragma region Window PAINT
-typedef struct tagPAINTSTRUCT {
-    HDC         hdc;
-    BOOL        fErase;
-    RECT        rcPaint;
-    BOOL        fRestore;
-    BOOL        fIncUpdate;
-    BYTE        rgbReserved[32];
-} PAINTSTRUCT, *PPAINTSTRUCT, *NPPAINTSTRUCT, *LPPAINTSTRUCT;
-
-WIN_LIBRARY_API HDC WINAPI
-BeginPaint( HWND hWnd, LPPAINTSTRUCT lpPaint );
-
-WIN_LIBRARY_API BOOL WINAPI
-EndPaint( HWND hWnd, CONST PAINTSTRUCT *lpPaint );
-
-WIN_LIBRARY_API BOOL WINAPI PatBlt( HDC hdc, int x, int y, int w, int h, DWORD rop );
-#pragma endregion Window PAINT
-
 // Class Style Constants
 // https://learn.microsoft.com/en-us/windows/win32/winmsg/about-window-classes
 // https://learn.microsoft.com/en-us/windows/win32/winmsg/window-class-styles
 
+enum BI : DWORD
+{
+	BI_RGB_Uncompressed = 0L,
+	BI_RunLength_Encoded_8bpp = 1L,
+	BI_RunLength_Encoded_4bpp = 2L,
+};
+
 enum CS : UINT
 {
 	CS_Own_Device_Context = CS_OWNDC,
@@ -104,12 +179,21 @@ enum CS : UINT
 	CS_Vertical_Redraw    = CS_VREDRAW,
 };
 
+enum DIB : UINT
+{
+	DIB_ColorTable_RGB     = 0,
+	DIB_ColorTable_Palette = 1
+
+};
+
 enum MB : UINT
 {
 	MB_Ok_Btn = MB_OK,
 	MB_Icon_Information = MB_ICONINFORMATION,
 };
 
+#define WM_ACTIVATEAPP 0x001C
+
 enum WS : UINT
 {
 	WS_Overlapped_Window = WS_OVERLAPPEDWINDOW,
@@ -118,8 +202,18 @@ enum WS : UINT
 
 enum RasterOps : DWORD
 {
+	RO_Source_To_Dest = (DWORD)0x00CC0020,
 	RO_Blackness      = (DWORD)0x00000042,
 	RO_Whiteness      = (DWORD)0x00FF0062,
 };
 
-// }
+WIN_LIBRARY_API_END
+NS_WIN32_END
+
+#undef _SAL_nop_impl_
+#undef _SAL2_Source_
+#undef _Deref_post2_impl_
+#undef _Outptr_result_bytebuffer_
+#undef _At_
+#undef _When_
+#undef GDI_DIBSIZE