--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/riscos/SDL_riscossprite.c	Thu May 29 04:44:13 2003 +0000
@@ -0,0 +1,263 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+/*
+     File added by Alan Buckley (alan_baa@hotmail.com) for RISCOS compatability
+	 27 March 2003
+
+     Implements Sprite plotting code for wimp display.window
+*/
+
+#include <stdlib.h>
+#include "kernel.h"
+#include "swis.h"
+#include "SDL_riscosvideo.h"
+
+extern void WIMP_ReadModeInfo(_THIS);
+
+void WIMP_PaletteChanged(_THIS);
+
+
+/* Create sprite buffer for screen */
+
+unsigned char *WIMP_CreateBuffer(int width, int height, int bpp)
+{
+	int size;
+	char sprite_name[12] = "display";
+	unsigned char *buffer;
+	_kernel_swi_regs regs;
+	int bytesPerPixel;
+	int bytesPerRow;
+	int offsetToSpriteData = 60;
+
+	switch(bpp)
+	{
+	case 32: bytesPerPixel = 4; break;
+	case 16: bytesPerPixel = 2; break;
+	case 8:
+	    bytesPerPixel = 1;
+	    offsetToSpriteData += 2048; /* Add in size of palette */
+	    break;
+	default:
+		return NULL;
+		break;
+	}
+
+	bytesPerRow = bytesPerPixel * width;
+
+	if ((bytesPerRow & 3) != 0)
+	{
+		bytesPerRow += 4 - (bytesPerRow & 3);
+	}
+	size = bytesPerRow * height;
+
+	buffer = malloc( (size_t) size + offsetToSpriteData );
+	if (!buffer) return NULL;
+
+   /* Initialise a sprite area */
+
+	*(unsigned int *)buffer		= size + offsetToSpriteData;
+	*(unsigned int *)(buffer + 8)	= 16;
+
+	regs.r[0] = 256+9;
+	regs.r[1] = (unsigned int)buffer;
+   _kernel_swi(OS_SpriteOp, &regs, &regs);
+
+	regs.r[0] = 256+15;
+	regs.r[1] = (unsigned int)buffer;
+	regs.r[2] = (unsigned int)&sprite_name;
+	regs.r[3] = 0; /* Palette flag: 0 = no palette */
+	regs.r[4] = width;
+	regs.r[5] = height;
+	if (bpp == 8)
+	{
+		/* Use old style mode number */
+		regs.r[6] = 28; /* 8bpp 90x90dpi */
+	} else
+	{
+		regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
+					| (90 << 14) /* Vertical dpi */
+					| (90 << 1)  /* Horizontal dpi */
+					| 1; /* Marker to distinguish between mode selectors and sprite modes */
+	}
+   if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL)
+   {
+       if (bpp == 8)
+       {
+          /* Modify sprite to take into account 256 colour palette */
+          int *sprite = (int *)(buffer + 16);
+          /* Adjust sprite offsets */
+          sprite[0] += 2048;
+          sprite[8] += 2048;
+          sprite[9] += 2048;
+          /* Adjust sprite area next free pointer */
+          (*(int *)(buffer+12)) += 2048;
+
+          /* Don't need to set up palette as SDL sets up the default
+             256 colour palette */
+/*          {
+             int *pal = sprite + 11;
+             unsigned int j;
+             unsigned int entry;
+             for (j = 0; j < 255; j++)
+             {
+                entry = (j << 24) | (j << 16) | (j << 8);
+                *pal++ = entry;
+                *pal++ = entry;
+             }
+          }
+*/
+       }
+   } else
+   {
+      free(buffer);
+      buffer = NULL;
+   }
+
+   return buffer;
+}
+
+
+/* Setup translation buffers for the sprite plotting */
+
+void WIMP_SetupPlotInfo(_THIS)
+{
+   _kernel_swi_regs regs;
+   int *sprite = ((int *)this->hidden->bank[1])+4;
+
+   regs.r[0] = (unsigned int)this->hidden->bank[1];
+   regs.r[1] = (unsigned int)sprite;
+   regs.r[2] = -1; /* Current mode */
+   regs.r[3] = -1; /* Current palette */
+   regs.r[4] = 0; /* Get size of buffer */
+   regs.r[5] = 1|2|16; /* R1 - pointer to sprite and can use full palette words */
+   regs.r[6] = 0;
+   regs.r[7] = 0;
+
+   if (this->hidden->pixtrans) free(this->hidden->pixtrans);
+   this->hidden->pixtrans = 0;
+
+   /* Get the size required for the buffer */
+   _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
+   if (regs.r[4])
+   {
+      this->hidden->pixtrans = malloc(regs.r[4]);
+    
+      regs.r[4] = (unsigned int)this->hidden->pixtrans;
+      /* Actually read the buffer */
+      _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
+   }
+}
+
+/* Plot the sprite in the given context */
+void WIMP_PlotSprite(_THIS, int x, int y)
+{
+   _kernel_swi_regs regs;
+   _kernel_oserror *err;
+
+   regs.r[0] =  52 + 512;
+   regs.r[1] = (unsigned int)this->hidden->bank[1];
+   regs.r[2] = (unsigned int)this->hidden->bank[1]+16;
+   regs.r[3] = x;
+   regs.r[4] = y;
+   regs.r[5] = 0|32; /* Overwrite screen and pixtrans contains wide colour entries */
+   regs.r[6] = 0; /* No scale factors i.e. 1:1 */
+   regs.r[7] = (int)this->hidden->pixtrans;
+
+   if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0)
+   {
+      int *p = (int *)this->hidden->pixtrans;
+      printf("OS_SpriteOp failed \n%s\n",err->errmess);
+      printf("pixtrans %d\n", (int)this->hidden->pixtrans);
+      printf("%x %x %x\n", p[0], p[1], p[2]);
+   }
+}
+
+
+/* Wimp mode has changes so update colour mapping and pixel sizes 
+   of windows and the sprites they plot */
+
+void WIMP_ModeChanged(_THIS)
+{
+	int oldXeig = this->hidden->xeig;
+	int oldYeig = this->hidden->yeig;
+
+	WIMP_ReadModeInfo(this);
+
+	if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig)
+	{
+		/* Only need to update the palette */
+		WIMP_PaletteChanged(this);
+	} else
+	{
+		_kernel_swi_regs regs;
+		int window_state[9];
+		int extent[4];
+		int currWidth, currHeight;
+		int newWidth, newHeight;
+		
+		/* Need to resize windows and update the palette */
+		WIMP_SetupPlotInfo(this);
+
+
+		window_state[0] = this->hidden->window_handle;
+		regs.r[1] = (unsigned int)window_state;
+		_kernel_swi(Wimp_GetWindowState, &regs, &regs);
+						
+		currWidth = window_state[3] - window_state[1];
+		currHeight = window_state[4] - window_state[2];
+		
+		newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
+		newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
+		/* Need to avoid extent getting too small for visible part
+		of window */
+		extent[0] = 0;
+		if (currHeight <= newHeight)
+		{
+			extent[1] = -newHeight;
+		} else
+		{
+			extent[1] = -currHeight;
+		}
+		if (currWidth <= newWidth)
+		{
+			extent[2] = newWidth;
+		} else
+		{
+			extent[2] = currWidth;
+		}
+		extent[3] = 0;
+		
+		regs.r[0] = this->hidden->window_handle;
+		regs.r[1] = (int)extent;
+		_kernel_swi(Wimp_SetExtent, &regs, &regs);
+
+		/*TODO: May need to set flag to resize window on next open */
+	}
+}
+
+/* Palette has changed so update palettes used for windows sprites */
+
+void WIMP_PaletteChanged(_THIS)
+{
+	WIMP_SetupPlotInfo(this);
+}