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SDL_riscossprite.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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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
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/*
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File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
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27 March 2003
Implements Sprite plotting code for wimp display.window
*/
#include "kernel.h"
#include "swis.h"
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#include "SDL_stdinc.h"
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#include "SDL_riscosvideo.h"
extern void WIMP_ReadModeInfo(_THIS);
void WIMP_PaletteChanged(_THIS);
/* Create sprite buffer for screen */
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unsigned char *
WIMP_CreateBuffer(int width, int height, int bpp)
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{
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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 = SDL_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, ®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;
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, ®s, ®s) == 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 */
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/* {
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;
}
}
*/
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}
} else {
SDL_free(buffer);
buffer = NULL;
}
return buffer;
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}
/* Setup translation buffers for the sprite plotting */
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void
WIMP_SetupPlotInfo(_THIS)
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{
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_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);
}
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}
/* Plot the sprite in the given context */
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void
WIMP_PlotSprite(_THIS, int x, int y)
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{
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_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, ®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]);
}
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}
/* Wimp mode has changes so update colour mapping and pixel sizes
of windows and the sprites they plot */
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void
WIMP_ModeChanged(_THIS)
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{
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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, ®s, ®s);
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, ®s, ®s);
/*TODO: May need to set flag to resize window on next open */
}
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}
/* Palette has changed so update palettes used for windows sprites */
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void
WIMP_PaletteChanged(_THIS)
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{
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WIMP_SetupPlotInfo(this);
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}
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/* vi: set ts=4 sw=4 expandtab: */