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/framebuffer.c | 193 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 139 insertions(+), 54 deletions(-)

(limited to 'source/framebuffer.c')

diff --git a/source/framebuffer.c b/source/framebuffer.c
index 691862e..6d16529 100644
--- a/source/framebuffer.c
+++ b/source/framebuffer.c
@@ -25,12 +25,16 @@
 #include <stdarg.h>
 #include <string.h>
 
+#include "framebuffer.h"
+
 /* ---------------------------------------- STATIC DATA
 */
 #define WIDTH	256
+#define SCAN	128
 #define HEIGHT	192
 
-static uint16	*buff=0;
+static uint16	*buff;
+static uint16	*pal;
 
 static uint8	font[]=
 {
@@ -132,60 +136,138 @@ static uint8	font[]=
     0x3c, 0x42, 0x99, 0x85, 0x85, 0x99, 0x42, 0x3c
 };
 
+
+/* ---------------------------------------- PRIVATE INTERFACES
+*/
+static inline void Plot(int x, int y, int col)
+{
+    uint16 *base;
+    uint16 cur;
+    int odd;
+
+    if (col == -1)
+    	return;
+
+    odd = x&1;
+    x /= 2;
+
+    base = buff+x+y*SCAN;
+    cur = *base;
+
+    if (odd)
+    {
+    	cur = (cur & 0xff) | (col<<8);
+    }
+    else
+    {
+    	cur = (cur & 0xff00) | col;
+    }
+
+    *base = cur;
+}
+
+
 /* ---------------------------------------- PUBLIC INTERFACES
 */
-void FB_Init(uint16 *vram)
+void FB_Init(uint16 *vram, uint16 *palette)
 {
-    buff=vram;
+    buff = vram;
+    pal = palette;
+
+    pal[COL_BLACK] = RGB15(0,0,0);
+    pal[COL_WHITE] = RGB15(31,31,31);
+    pal[COL_RED] = RGB15(31,0,0);
+    pal[COL_GREEN] = RGB15(0,31,0);
+    pal[COL_BLUE] = RGB15(0,0,31);
+    pal[COL_GUISELECT] = RGB15(8,8,31);
+    pal[COL_GREY] = RGB15(15,15,15);
+    pal[COL_LIGHTGREY] = RGB15(22,22,22);
+    pal[COL_DARKGREY] = RGB15(8,8,8);
+    pal[COL_YELLOW] = RGB15(31,31,0);
 }
 
 
-void FB_Print(const char *text, int x, int y, int colour, int paper)
+void FB_LoadASCIITiles(uint16 *tiles)
 {
-    uint16 *base;
+    uint8 *src;
+    int c;
+    int row;
+    int val;
+    int mask;
 
-    base=buff+y*WIDTH+x;
+    src = font;
 
-    while(*text)
+    for(c = 32; c < 127; c++)
     {
-	int x,y;
-    	int ch;
+	for(row = 0; row < 8; row++)
+	{
+	    for(mask = 1; mask < 0xff; mask<<=1)
+	    {
+		if (*src & mask)
+		{
+		    val = COL_WHITE;
+		}
+		else
+		{
+		    val = 0;
+		}
+
+		mask <<= 1;
+
+		if (*src & mask)
+		{
+		    val |= COL_WHITE << 8;
+		}
+
+		*tiles++ = val;
+	    }
+
+	src++;
+	}
+    }
+}
+
 
+void FB_Print(const char *text, int x, int y, FB_Colour colour, FB_Colour paper)
+{
+    int cx,cy;
+    int ch;
+
+    while(*text)
+    {
 	ch=((*text)-32)*8;
 
-	for(y=0;y<8;y++)
+	for(cy=0;cy<8;cy++)
 	{
-	    for(x=0;x<8;x++)
+	    for(cx=0;cx<8;cx++)
 	    {
-		if (font[ch]&(1<<x))
+		if (font[ch]&(1<<cx))
 		{
-		    *(base+x+y*WIDTH)=colour;
+		    Plot(x+cx, y+cy, colour);
 		}
 		else
 		{
-		    if (paper!=-1)
-		    {
-			*(base+x+y*WIDTH)=paper;
-		    }
+		    Plot(x+cx, y+cy, paper);
 		}
 	    }
 
 	    ch++;
 	}
 
-	base+=8;
+	x+=8;
 	text++;
     }
 }
 
 
-void FB_Centre(const char *text, int y, int colour, int paper)
+void FB_Centre(const char *text, int y, FB_Colour colour, FB_Colour paper)
 {
     FB_Print(text,WIDTH/2-strlen(text)*4,y,colour,paper);
 }
 
 
-void FB_printf(int x, int y, int colour, int paper, const char *format, ...)
+void FB_printf(int x, int y, FB_Colour colour, FB_Colour paper,
+	       const char *format, ...)
 {
     char buff[80];
     va_list va;
@@ -198,7 +280,7 @@ void FB_printf(int x, int y, int colour, int paper, const char *format, ...)
 }
 
 
-void FB_HLine(int x1, int x2, int y, int colour)
+void FB_HLine(int x1, int x2, int y, FB_Colour colour)
 {
     uint16 *line;
 
@@ -206,28 +288,21 @@ void FB_HLine(int x1, int x2, int y, int colour)
 
     while(x1<=x2)
     {
-    	*line++=colour;
-	x1++;
+    	Plot(x1++,y,colour);
     }
 }
 
 
-void FB_VLine(int x, int y1, int y2, int colour)
+void FB_VLine(int x, int y1, int y2, FB_Colour colour)
 {
-    uint16 *line;
-
-    line=buff+y1*WIDTH+x;
-
     while(y1<=y2)
     {
-    	*line=colour;
-	line+=WIDTH;
-	y1++;
+	Plot(x,y1++,colour);
     }
 }
 
 
-void FB_Box(int x, int y, int w, int h, int colour)
+void FB_Box(int x, int y, int w, int h, FB_Colour colour)
 {
     FB_HLine(x,x+w-1,y,colour);
     FB_HLine(x,x+w-1,y+h-1,colour);
@@ -236,21 +311,11 @@ void FB_Box(int x, int y, int w, int h, int colour)
 }
 
 
-void FB_FillBox(int x, int y, int w, int h, int colour)
+void FB_FillBox(int x, int y, int w, int h, FB_Colour colour)
 {
-    int f;
-    uint16 *base;
-
-    base=buff+x+y*WIDTH;
-
     while(h--)
     {
-    	for(f=0;f<w;f++)
-	{
-	    *(base+f)=colour;
-	}
-
-	base+=WIDTH;
+    	FB_HLine(x,x+w-1,y++,colour);
     }
 }
 
@@ -260,30 +325,50 @@ void FB_Clear(void)
     uint16 *p;
     int f;
 
-    f=WIDTH*HEIGHT;
+    f=WIDTH*HEIGHT/2;
     p=buff;
 
     while(f--)
     {
-    	*p++=0x8000;
+    	*p++=0;
     }
 }
 
 
-void FB_Blit(sImage *img, int x, int y)
+void FB_Blit(sImage *img, int x, int y, int offset)
 {
-    if (img->width==WIDTH && img->height==HEIGHT)
+    uint16 *dest;
+    uint16 *row;
+    uint8 *src;
+    uint16 pix;
+    int hww;
+    int ht;
+    int f;
+
+    x /= 2;
+
+    ht = img->height;
+    hww = img->width / 2;
+    dest = buff+x+y*SCAN;
+    src = img->image.data8;
+
+    for(f=0;f<16;f++)
     {
-	dmaCopy(img->image.data8,buff,SCREEN_WIDTH*SCREEN_HEIGHT*2);
+    	pal[offset+f] = img->palette[f];
     }
-    else
+
+    while(ht--)
     {
-    	int f;
+    	row = dest;
 
-	for(f=0;f<img->height;f++)
+    	for(f=0;f<hww;f++)
 	{
-	    dmaCopy(img->image.data16+(f*img->width),
-		    buff+x+(y+f)*WIDTH,img->width*2);
+	    pix = *src++ + offset;
+	    pix |= (*src++ + offset) << 8;
+
+	    *row++ = pix;
 	}
+
+	dest += SCAN;
     }
 }
-- 
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