/* 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 #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, ®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 */ /* { 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, ®s, ®s); 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, ®s, ®s); } } /* 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, ®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]); } } /* 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, ®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 */ } } /* Palette has changed so update palettes used for windows sprites */ void WIMP_PaletteChanged(_THIS) { WIMP_SetupPlotInfo(this); }