From 6be2806499299bb13edde3481803f28416429902 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Thu, 1 Mar 2007 00:36:54 +0000
Subject: Changed lower screen to 8-bits and added overlayed text mode. 
 Monitor stub in place.  Text mode helpers being developed.

---
 source/textmode.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 source/textmode.c

(limited to 'source/textmode.c')

diff --git a/source/textmode.c b/source/textmode.c
new file mode 100644
index 0000000..aa6de44
--- /dev/null
+++ b/source/textmode.c
@@ -0,0 +1,146 @@
+/*
+   ds81 - Nintendo DS ZX81 emulator.
+
+   Copyright (C) 2007  Ian Cowburn <ianc@noddybox.co.uk>
+   
+   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 2
+   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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+  
+   $Id$
+*/
+
+#include <nds.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "textmode.h"
+
+/* ---------------------------------------- STATIC DATA
+*/
+static int	mapw;
+static int	maph; 
+static uint16	*text;
+static int	is_rot;
+static void	(*draw_string)(const char *str, int x, int y);
+
+
+/* ---------------------------------------- PRIVATE INTERFACES
+*/
+static inline void Plot_Text(int x, int y, int c)
+{
+    int xw;
+    int yw;
+
+    xw = x/32;
+    yw = y/32;
+    x %= 32;
+    y %= 32;
+
+    *(text + x + y*32 + (xw+yw) * 1024) = c;
+}
+
+
+static inline void Plot_RS(int x, int y, int c)
+{
+    int xw;
+    int yw;
+
+    xw = x/32;
+    yw = y/32;
+    x %= 32;
+    y %= 32;
+
+    *(text + x + y*32 + (xw+yw) * 1024) = c;
+}
+
+
+static void Text_Put(const char *str, int x, int y)
+{
+    while(*str && x<mapw)
+    {
+    	Plot_Text(x,y,*str - 32);
+	x++;
+	str++;
+    }
+}
+
+static void RS_Put(const char *str, int x, int y)
+{
+    while(*str && x<mapw)
+    {
+    	Plot_RS(x,y,*str - 32);
+	x++;
+	str++;
+    }
+}
+
+/* ---------------------------------------- PUBLIC INTERFACES
+*/
+void TM_Init(uint16 *vram, int map_width, int map_height, int map_is_rotation)
+{
+    text = vram;
+
+    mapw = map_width;
+    maph = map_height;
+
+    is_rot = map_is_rotation;
+
+    draw_string = map_is_rotation ? Text_Put : RS_Put;
+
+    TM_Cls();
+}
+
+
+void TM_Cls(void)
+{
+    uint16 *scr;
+    int f;
+
+    scr = text;
+
+    if (is_rot)
+    {
+	for(f=0;f<mapw*maph/2;f++)
+	{
+	    *scr++=0;
+	}
+    }
+    else
+    {
+	for(f=0;f<mapw*maph;f++)
+	{
+	    *scr++=0;
+	}
+    }
+}
+
+
+void TM_Put(int x, int y, const char *str)
+{
+    draw_string(str,x,y);
+}
+
+
+void TM_printf(int x, int y, const char *format, ...)
+{
+    char buff[128];
+    va_list va;
+
+    va_start(va,format);
+    vsnprintf(buff,sizeof buff,format,va);
+    va_end(va);
+
+    draw_string(buff,x,y);
+}
-- 
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