| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2004 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" |
| |
| 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 = 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 */ |
| /* { |
| 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_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); |
| } |
| } |
| |
| /* 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); |
| } |