mirror of
https://github.com/stevenhowes/CTheEscape.git
synced 2026-05-26 15:53:29 +01:00
stevenhowes
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
#include <stdio.h>
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#include "swis.h"
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#include <kernel.h>
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// SWI Registers
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extern _kernel_swi_regs inreg;
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extern _kernel_swi_regs outreg;
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extern unsigned char *buffer;
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unsigned char screen = 1;
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// Loads sprite file into buffer
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void load_sprites(char* filename)
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{
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int length;
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// Attempt to get file info
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inreg.r[0] = 13;
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inreg.r[1] = (int) filename;
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_kernel_swi(OS_File,&inreg,&outreg);
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// Length will be in R4 if it exists
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length = outreg.r[4];
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// If it's <1 it's fil not found
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if(outreg.r[0] < 1)
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{
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printf("Sprite file %s not found",filename);
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exit(0);
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}
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// Stops us trying to mallocsomething mad if file is too big.
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if(length > 200000)
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{
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printf("Sprite file %s seems unreasonably large at %i bytes",filename, length);
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exit(0);
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}
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// Attempt malloc, die if we cant
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buffer = (unsigned char *) malloc(length + 4);
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if(buffer==NULL)
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{
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printf("Couldn't malloc %i bytes for sprite buffer",length);
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exit(0);
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}
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// Store size and other info as required for SpriteOp 9 to init sprite area
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*(unsigned int *)buffer = length + 4;
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*(unsigned int *)(buffer + 4) = 16;
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inreg.r[0] = 256+9;
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inreg.r[1] = (unsigned int) buffer;
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_kernel_swi(OS_SpriteOp,&inreg,&outreg);
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// Load sprite file into buffer
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inreg.r[0] = 256+10;
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inreg.r[1] = (int) buffer;
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inreg.r[2] = (int) filename;
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_kernel_swi(OS_SpriteOp,&inreg,&outreg);
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}
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void display_mode(int mode)
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{
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inreg.r[0] = 0;
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inreg.r[1] = mode;
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_kernel_swi(OS_ScreenMode,&inreg,&outreg);
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}
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void draw_line(int x1,int y1,int x2,int y2)
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{
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inreg.r[0] = 4;
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inreg.r[1] = x1;
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inreg.r[2] = y1;
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_kernel_swi(OS_Plot,&inreg,&outreg);
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inreg.r[0] = 5;
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inreg.r[1] = x2;
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inreg.r[2] = y2;
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_kernel_swi(OS_Plot,&inreg,&outreg);
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}
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void draw_sprite(char* spritename,int x, int y)
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{
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// SpriteOp 34 to put sprite at a location
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inreg.r[0] = 256+34;
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inreg.r[1] = (int) buffer;
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inreg.r[2] = (int) spritename;
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inreg.r[3] = x;
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inreg.r[4] = y;
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inreg.r[5] = 8; // GCOL dest=source and sprite mask
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_kernel_swi(OS_SpriteOp,&inreg,&outreg);
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}
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void screen_flipbuffer()
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{
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inreg.r[0] = 19;
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_kernel_swi(OS_Byte,&inreg,&outreg);
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/* inreg.r[0] = 114;
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inreg.r[1] = 1;
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_kernel_swi(OS_Byte,&inreg,&outreg);
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inreg.r[0] = 113;
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inreg.r[1] = screen;
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_kernel_swi(OS_Byte,&inreg,&outreg);
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screen++;
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if(screen > 3)
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screen = 1;
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inreg.r[0] = 112;
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inreg.r[1] = screen;
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_kernel_swi(OS_Byte,&inreg,&outreg);*/
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}
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void screen_clear()
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{
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inreg.r[0] = 12;
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_kernel_swi(OS_WriteC,&inreg,&outreg);
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}
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