From eeef0966f0448d71e79ad43d53769afebd47b459 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Fri, 2 Mar 2007 23:18:38 +0000
Subject: Added support for text rotation modes to textmode interface

---
 source/main.c     | 32 +++++++++++++++++++++-----------
 source/textmode.c | 27 +++++++++++++++++++--------
 2 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/source/main.c b/source/main.c
index 9d25ee0..2fc613c 100644
--- a/source/main.c
+++ b/source/main.c
@@ -75,7 +75,7 @@ static void Splash(void)
 {
     static char scroller[]=
     {
-    	"                                "
+    	"                   "
 	"Welcome to DS81, a ZX81 emulator for the Ninetendo DS.  "
 	"You can safely ignore this message.  I was just bored for half an "
 	"hour.  "
@@ -109,7 +109,10 @@ static void Splash(void)
     ZX81SuspendDisplay();
     ZX81DisplayString("10 print '%the zx81 is ace%'\n20 goto 10");
 
-    TM_printf(0,23,"%-34.34s",scroller);
+    SUB_BG2_XDX = 0x080;
+    SUB_BG2_YDY = 0x080;
+
+    TM_printf(0,11,"%-18.18s",scroller);
 
     FB_Clear();
 
@@ -186,13 +189,15 @@ static void Splash(void)
 	    memmove(scroller,scroller+1,l-2);
 	    scroller[l-2] = c;
 
-	    TM_printf(0,23,"%-34.34s",scroller);
+	    TM_printf(0,11,"%-18.18s",scroller); 
 	}
 
-	SUB_BG0_X0 = scr_x;
+	SUB_BG2_CX = scr_x << 8;
     }
 
-    SUB_BG0_X0 = 0;
+    SUB_BG2_XDX = 0x100;
+    SUB_BG2_YDY = 0x100;
+    SUB_BG2_CX = 0;
 
     ZX81ResumeDisplay();
 }
@@ -296,15 +301,20 @@ int main(int argc, char *argv[])
     /* Set up the sub-screen for rotation (basically for use as a framebuffer).
        Now overlaid with a text screen for the monitor (I thought a bitmapped
        printing routine would needlessly slow down the monitor when watching
-       the ZX81 run).
+       the ZX81 run).  Having said the overlay is currently a rotation map
+       for some pointless frippery!  Still be quicker though.
     */
-    videoSetModeSub(MODE_3_2D | DISPLAY_BG0_ACTIVE | DISPLAY_BG3_ACTIVE);
+    videoSetModeSub(MODE_4_2D | DISPLAY_BG2_ACTIVE | DISPLAY_BG3_ACTIVE);
     vramSetBankC(VRAM_C_SUB_BG_0x06200000);
 
-    SUB_BG0_CR = BG_COLOR_256 | BG_64x32 | BG_MAP_BASE(4) |
+    SUB_BG2_CR = BG_COLOR_256 | BG_RS_64x64 | BG_MAP_BASE(4) |
 		    BG_TILE_BASE(0) | BG_PRIORITY(0);
-    SUB_BG0_X0 = 0;
-    SUB_BG0_Y0 = 0;
+    SUB_BG2_XDX = 0x100;
+    SUB_BG2_XDY = 0;
+    SUB_BG2_YDX = 0;
+    SUB_BG2_YDY = 0x100;
+    SUB_BG2_CX = 0;
+    SUB_BG2_CY = 0;
 
     SUB_BG3_CR = BG_BMP8_256x256 | BG_BMP_BASE(1) | BG_PRIORITY(1);
     SUB_BG3_XDX = 0x100;
@@ -321,7 +331,7 @@ int main(int argc, char *argv[])
     /* Set up lower screen text overlay
     */
     FB_LoadASCIITiles((uint16*)BG_TILE_RAM_SUB(0));
-    TM_Init((uint16*)BG_MAP_RAM_SUB(4),64,32,FALSE);
+    TM_Init((uint16*)BG_MAP_RAM_SUB(4),64,64,TRUE);
 
     /* Set up interrupts and timers 
     */
diff --git a/source/textmode.c b/source/textmode.c
index aa6de44..0de43f6 100644
--- a/source/textmode.c
+++ b/source/textmode.c
@@ -54,15 +54,26 @@ static inline void Plot_Text(int x, int y, int c)
 
 static inline void Plot_RS(int x, int y, int c)
 {
-    int xw;
-    int yw;
+    uint16 ch;
+    int odd;
+    uint16 *off;
 
-    xw = x/32;
-    yw = y/32;
-    x %= 32;
-    y %= 32;
+    odd = x&1;
 
-    *(text + x + y*32 + (xw+yw) * 1024) = c;
+    off = text + x/2 + y*mapw/2;
+
+    ch = *off;
+
+    if (odd)
+    {
+    	ch = (c<<8) | (ch&0xff);
+    }
+    else
+    {
+    	ch = c | (ch&0xff00);
+    }
+
+    *off = ch;
 }
 
 
@@ -97,7 +108,7 @@ void TM_Init(uint16 *vram, int map_width, int map_height, int map_is_rotation)
 
     is_rot = map_is_rotation;
 
-    draw_string = map_is_rotation ? Text_Put : RS_Put;
+    draw_string = map_is_rotation ? RS_Put : Text_Put;
 
     TM_Cls();
 }
-- 
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