From 3446e3c9a9ba8e85f5262e98a65e48a5de7c8581 Mon Sep 17 00:00:00 2001
From: galaxyhaxz <galaxy-haxz@hotmail.com>
Date: Tue, 16 Apr 2019 19:43:50 -0500
Subject: [PATCH] Add defs for screen resolution

---
 Source/dx.cpp       | 12 ++++++------
 Source/scrollrt.cpp | 28 ++++++++++++++--------------
 defs.h              |  6 ++++++
 3 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/Source/dx.cpp b/Source/dx.cpp
index f14ab8b04..3aa54aae6 100644
--- a/Source/dx.cpp
+++ b/Source/dx.cpp
@@ -62,9 +62,9 @@ void dx_init(HWND hWnd)
 		ErrDlg(IDD_DIALOG1, v4, "C:\\Src\\Diablo\\Source\\dx.cpp", 170);
 	}
 #ifdef __cplusplus
-	if (lpDDInterface->SetDisplayMode(640, 480, 8)) {
+	if (lpDDInterface->SetDisplayMode(SCREEN_WIDTH, SCREEN_HEIGHT, 8)) {
 #else
-	if (lpDDInterface->lpVtbl->SetDisplayMode(lpDDInterface, 640, 480, 8)) {
+	if (lpDDInterface->lpVtbl->SetDisplayMode(lpDDInterface, SCREEN_WIDTH, SCREEN_HEIGHT, 8)) {
 #endif
 		v6 = GetSystemMetrics(SM_CXSCREEN);
 		v7 = GetSystemMetrics(SM_CYSCREEN);
@@ -111,7 +111,7 @@ void dx_create_back_buffer()
 #else
 			lpDDSPrimary->lpVtbl->Unlock(lpDDSPrimary, NULL);
 #endif
-			sgpBackBuf = (BYTE *)DiabloAllocPtr(656 * 768);
+			sgpBackBuf = (BYTE *)DiabloAllocPtr(BUFFER_HEIGHT * BUFFER_WIDTH);
 			return;
 		}
 		if (error_code != DDERR_CANTLOCKSURFACE)
@@ -119,12 +119,12 @@ void dx_create_back_buffer()
 	}
 
 	memset(&ddsd, 0, sizeof(ddsd));
-	ddsd.dwWidth = 768;
-	ddsd.lPitch = 768;
+	ddsd.dwWidth = BUFFER_WIDTH;
+	ddsd.lPitch = BUFFER_WIDTH;
 	ddsd.dwSize = sizeof(ddsd);
 	ddsd.dwFlags = DDSD_PIXELFORMAT | DDSD_PITCH | DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS;
 	ddsd.ddsCaps.dwCaps = DDSCAPS_SYSTEMMEMORY | DDSCAPS_OFFSCREENPLAIN;
-	ddsd.dwHeight = 656;
+	ddsd.dwHeight = BUFFER_HEIGHT;
 	ddsd.ddpfPixelFormat.dwSize = sizeof(ddsd.ddpfPixelFormat);
 #ifdef __cplusplus
 	error_code = lpDDSPrimary->GetPixelFormat(&ddsd.ddpfPixelFormat);
diff --git a/Source/scrollrt.cpp b/Source/scrollrt.cpp
index 8c726d76a..d53736f42 100644
--- a/Source/scrollrt.cpp
+++ b/Source/scrollrt.cpp
@@ -2197,12 +2197,12 @@ void ClearScreenBuffer()
 	__asm {
 		mov		edi, gpBuffer
 		add		edi, SCREENXY(0, 0)
-		mov		edx, 480
+		mov		edx, SCREEN_HEIGHT
 		xor		eax, eax
 	zeroline:
-		mov		ecx, 640 / 4
+		mov		ecx, SCREEN_WIDTH / 4
 		rep stosd
-		add		edi, 768 - 640
+		add		edi, BUFFER_WIDTH - SCREEN_WIDTH
 		dec		edx
 		jnz		zeroline
 	}
@@ -2212,8 +2212,8 @@ void ClearScreenBuffer()
 
 	dst = &gpBuffer[SCREENXY(0, 0)];
 
-	for (i = 0; i < 480; i++, dst += 768) {
-		memset(dst, 0, 640);
+	for (i = 0; i < SCREEN_HEIGHT; i++, dst += BUFFER_WIDTH) {
+		memset(dst, 0, SCREEN_WIDTH);
 	}
 #endif
 
@@ -2246,7 +2246,7 @@ void ScrollView()
 			scroll = TRUE;
 		}
 	}
-	if (MouseX > 640 - 20) {
+	if (MouseX > SCREEN_WIDTH - 20) {
 		if (dmaxx - 1 <= ViewX || dminy >= ViewY) {
 			if (dmaxx - 1 > ViewX) {
 				ViewX++;
@@ -2278,7 +2278,7 @@ void ScrollView()
 			scroll = TRUE;
 		}
 	}
-	if (MouseY > 480 - 20) {
+	if (MouseY > SCREEN_HEIGHT - 20) {
 		if (dmaxy - 1 <= ViewY || dmaxx - 1 <= ViewX) {
 			if (dmaxy - 1 > ViewY) {
 				ViewY++;
@@ -2371,20 +2371,20 @@ void scrollrt_draw_cursor_item()
 	mx = MouseX - 1;
 	if (mx < 0) {
 		mx = 0;
-	} else if (mx > 640 - 1) {
+	} else if (mx > SCREEN_WIDTH - 1) {
 		return;
 	}
 	my = MouseY - 1;
 	if (my < 0) {
 		my = 0;
-	} else if (my > 480 - 1) {
+	} else if (my > SCREEN_HEIGHT - 1) {
 		return;
 	}
 
 	sgdwCursX = mx;
 	sgdwCursWdt = sgdwCursX + cursW + 1;
-	if (sgdwCursWdt > 640 - 1) {
-		sgdwCursWdt = 640 - 1;
+	if (sgdwCursWdt > SCREEN_WIDTH - 1) {
+		sgdwCursWdt = SCREEN_WIDTH - 1;
 	}
 	sgdwCursX &= ~3;
 	sgdwCursWdt |= 3;
@@ -2393,8 +2393,8 @@ void scrollrt_draw_cursor_item()
 
 	sgdwCursY = my;
 	sgdwCursHgt = sgdwCursY + cursH + 1;
-	if (sgdwCursHgt > 480 - 1) {
-		sgdwCursHgt = 480 - 1;
+	if (sgdwCursHgt > SCREEN_HEIGHT - 1) {
+		sgdwCursHgt = SCREEN_HEIGHT - 1;
 	}
 	sgdwCursHgt -= sgdwCursY;
 	sgdwCursHgt++;
@@ -2635,7 +2635,7 @@ void DoBlitScreen(DWORD dwX, DWORD dwY, DWORD dwWdt, DWORD dwHgt)
 	} else {
 		nSrcOff = SCREENXY(dwX, dwY);
 		nDstOff = dwX + dwY * DDS_desc.lPitch;
-		nSrcWdt = 768 - dwWdt;
+		nSrcWdt = BUFFER_WIDTH - dwWdt;
 		nDstWdt = DDS_desc.lPitch - dwWdt;
 		dwWdt >>= 2;
 
diff --git a/defs.h b/defs.h
index 71d1f7f90..0496dfcf0 100644
--- a/defs.h
+++ b/defs.h
@@ -85,6 +85,12 @@
 #define PAL16_RED		224
 #define PAL16_GRAY		240
 
+#define SCREEN_WIDTH	640
+#define SCREEN_HEIGHT	480
+#define BUFFER_WIDTH	768
+#define BUFFER_HEIGHT	656
+#define TILE_SIZE		32
+
 #define SCREENXY(x, y)	((x) + 64 + (((y) + 160) * 768))
 
 #define MemFreeDbg(p)	\