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SDL_riscossprite.c
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SDL_riscossprite.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 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@libsdl.org
*/
#include "SDL_config.h"
/*
File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
27 March 2003
Implements Sprite plotting code for wimp display.window
*/
#include "kernel.h"
#include "swis.h"
#include "SDL_stdinc.h"
#include "SDL_riscosvideo.h"
/* Check if the given pixel format is supported as a sprite */
int WIMP_IsSupportedSpriteFormat(const RISCOS_PixelFormat *fmt)
{
_kernel_swi_regs r;
int c;
/* HACK: Mode 28 won't report as having a full palette. Just assume it's supported */
if (fmt->sprite_mode_word == 28) return 0;
/* OS_ReadModeVariable supports sprite mode words, so we can use that to sanity check things */
r.r[0] = fmt->sprite_mode_word;
r.r[1] = 3; /* NColour */
_kernel_swi_c(OS_ReadModeVariable,&r,&r,&c);
if (c || (r.r[2] != fmt->ncolour)) return -1;
r.r[1] = 0; /* ModeFlags */
_kernel_swi_c(OS_ReadModeVariable,&r,&r,&c);
if (c || ((r.r[2] & 0xf280) != fmt->modeflags)) return -1;
r.r[1] = 9; /* Log2BPP */
_kernel_swi_c(OS_ReadModeVariable,&r,&r,&c);
if (c || (r.r[2] != fmt->log2bpp)) return -1;
/* Looks good */
return 0;
}
/* Find a supported sprite format in the given BPP */
const RISCOS_SDL_PixelFormat *WIMP_FindSupportedSpriteFormat(int bpp)
{
int pass;
const RISCOS_SDL_PixelFormat *fmt;
for(pass=0;pass<2;pass++)
{
for (fmt = RISCOS_SDL_PixelFormats;fmt->sdl_bpp;fmt++)
{
if (fmt->sdl_bpp != bpp)
{
continue;
}
if (!WIMP_IsSupportedSpriteFormat(&fmt->ro))
{
return fmt;
}
}
/* Fuzzy matching for 15bpp & 16bpp */
if (bpp == 15) { bpp = 16; }
else if (bpp == 16) { bpp = 15; }
else { break; }
}
return NULL;
}
/* Create sprite buffer for screen */
unsigned char *WIMP_CreateBuffer(int width, int height, const RISCOS_PixelFormat *format)
{
int size;
char sprite_name[12] = "display";
unsigned char *buffer;
_kernel_swi_regs regs;
_kernel_oserror *error;
int bytesPerPixel = 1 << (format->log2bpp-3);
int bytesPerRow;
int offsetToSpriteData = 60;
if (format->log2bpp == 3)
{
offsetToSpriteData += 2048; /* Add in size of palette */
}
bytesPerRow = bytesPerPixel * width;
if ((bytesPerRow & 3) != 0)
{
bytesPerRow += 4 - (bytesPerRow & 3);
}
size = bytesPerRow * height;
buffer = SDL_malloc( (size_t) size + offsetToSpriteData );
if (!buffer) {
SDL_OutOfMemory();
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, ®s, ®s);
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;
regs.r[6] = format->sprite_mode_word;
error = _kernel_swi(OS_SpriteOp, ®s, ®s);
if (error == NULL)
{
if (format->log2bpp == 3)
{
/* 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
{
SDL_SetError("Unable to create sprite: %s (%i)", error->errmess, error->errnum);
SDL_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) SDL_free(this->hidden->pixtrans);
this->hidden->pixtrans = 0;
/* Get the size required for the buffer */
_kernel_swi(ColourTrans_GenerateTable, ®s, ®s);
if (regs.r[4])
{
this->hidden->pixtrans = SDL_malloc(regs.r[4]);
regs.r[4] = (unsigned int)this->hidden->pixtrans;
/* Actually read the buffer */
_kernel_swi(ColourTrans_GenerateTable, ®s, ®s);
}
if (this->hidden->scale) SDL_free(this->hidden->scale);
this->hidden->scale = 0; /* No scale factors i.e. 1:1 */
if (this->hidden->xeig != 1 || this->hidden->yeig != 1) {
int eig_mul[4] = { 2, 1, 1, 1 };
int eig_div[4] = { 1, 1, 2, 4 };
this->hidden->scale = SDL_malloc(16);
this->hidden->scale[0] = eig_mul[this->hidden->xeig];
this->hidden->scale[1] = eig_mul[this->hidden->yeig];
this->hidden->scale[2] = eig_div[this->hidden->xeig];
this->hidden->scale[3] = eig_div[this->hidden->yeig];
}
}
/* 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] = (int)this->hidden->scale;
regs.r[7] = (int)this->hidden->pixtrans;
if ((err = _kernel_swi(OS_SpriteOp, ®s, ®s)) != 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]);
}
}