mirror of
https://github.com/sehugg/8bitworkshop.git
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121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
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#include "neslib.h"
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#pragma data-name (push,"CHARS")
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#pragma data-name(pop)
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//#link "tileset1.c"
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// tile set, two planes for 4 colors
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extern unsigned char TILESET[8*256];
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//variables
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static unsigned char i;
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static unsigned char pad,spr;
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static unsigned char touch;
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static unsigned char frame;
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//two players coords
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static unsigned char cat_x[2];
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static unsigned char cat_y[2];
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//first player metasprite, data structure explained in neslib.h
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const unsigned char metaCat1[]={
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0, 0, 0x50, 0,
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8, 0, 0x51, 1,
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16, 0, 0x52, 0,
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0, 8, 0x60, 0,
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8, 8, 0x61, 0,
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16, 8, 0x62, 0,
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0, 16, 0x70, 0,
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8, 16, 0x71, 0,
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16, 16, 0x72, 0,
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128
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};
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//second player metasprite, the only difference is palette number
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const unsigned char metaCat2[]={
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0, 0, 0x50, 0,
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8, 0, 0x51, 1,
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16, 0, 0x52, 0,
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0, 8, 0x60, 1,
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8, 8, 0x61, 1,
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16, 8, 0x62, 1,
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0, 16, 0x70, 1,
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8, 16, 0x71, 1,
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16, 16, 0x72, 1,
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128
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};
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void main(void)
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{
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//copy tileset to RAM
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vram_adr(0x0);
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vram_write((unsigned char*)TILESET, sizeof(TILESET));
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ppu_on_all();//enable rendering
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//set initial coords
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cat_x[0]=52;
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cat_y[0]=100;
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cat_x[1]=180;
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cat_y[1]=100;
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//init other vars
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touch=0;//collision flag
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frame=0;//frame counter
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//now the main loop
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while(1)
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{
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ppu_wait_nmi();//wait for next TV frame
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//flashing color for touch
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i=frame&1?0x30:0x2a;
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pal_col(17,touch?i:0x21);//set first sprite color
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pal_col(21,touch?i:0x26);//set second sprite color
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//process players
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spr=0;
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for(i=0;i<2;++i)
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{
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//display metasprite
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spr=oam_meta_spr(cat_x[i],cat_y[i],spr,!i?metaCat1:metaCat2);
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//poll pad and change coordinates
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pad=pad_poll(i);
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if(pad&PAD_LEFT &&cat_x[i]> 0) cat_x[i]-=2;
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if(pad&PAD_RIGHT&&cat_x[i]<232) cat_x[i]+=2;
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if(pad&PAD_UP &&cat_y[i]> 0) cat_y[i]-=2;
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if(pad&PAD_DOWN &&cat_y[i]<212) cat_y[i]+=2;
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}
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//check for collision for a smaller bounding box
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//metasprite is 24x24, collision box is 20x20
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if(!(cat_x[0]+22< cat_x[1]+2 ||
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cat_x[0]+ 2>=cat_x[1]+22||
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cat_y[0]+22< cat_y[1]+2 ||
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cat_y[0]+ 2>=cat_y[1]+22)) touch=1; else touch=0;
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frame++;
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}
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}
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