mirror of
https://github.com/sehugg/8bitworkshop.git
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106 lines
12 KiB
C
106 lines
12 KiB
C
//this example shows how to set up a palette and use 8x8 HW sprites
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//also shows how fast (or slow) C code is
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#include "neslib.h"
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// palette for balls, there are four sets for different ball colors
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const unsigned char palSprites[16]={/*{pal:"nes",n:4,sets:4}*/
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0x0f,0x17,0x27,0x37,
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0x0f,0x11,0x21,0x31,
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0x0f,0x15,0x25,0x35,
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0x0f,0x19,0x29,0x39
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};
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// tile set, two planes for 4 colors
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const unsigned char TILESET[8*256] = {/*{w:8,h:8,bpp:1,count:256,brev:1,np:2,pofs:8,remap:[0,1,2,4,5,6,7,8,9,10,11,12]}*/
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0x3F,0x3F,0x1F,0x1F,0x0F,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC3,0xE7,0xFF,0xDB,0x3C,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0xFC,0xF8,0xF8,0xF0,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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};
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//general purpose vars
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static unsigned char i,j;
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static unsigned char spr;
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//total number of balls on the screen
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//since there are 64 HW sprites, it is absolute max
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#define BALLS_MAX 64
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//balls parameters
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static unsigned char ball_x[BALLS_MAX];
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static unsigned char ball_y[BALLS_MAX];
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static unsigned char ball_dx[BALLS_MAX];
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static unsigned char ball_dy[BALLS_MAX];
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void main(void)
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{
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//copy tileset to RAM
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vram_write((unsigned char*)TILESET, 0x0, sizeof(TILESET));
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|
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pal_spr(palSprites);//set palette for sprites
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oam_size(1);
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ppu_on_all();//enable rendering
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|
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//initialize balls parameters
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for(i=0;i<BALLS_MAX;++i)
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{
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//starting coordinates
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|
|
ball_x[i]=rand8();
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ball_y[i]=rand8();
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|
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//direction bits
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j=rand8();
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|
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//horizontal speed -3..-3, excluding 0
|
|
spr=1+(rand8()%3);
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|
ball_dx[i]=j&1?-spr:spr;
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|
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//vertical speed
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|
|
spr=1+(rand8()%3);
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|
ball_dy[i]=j&2?-spr:spr;
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|
}
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//now the main loop
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|
|
while(1)
|
|
{
|
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ppu_waitnmi();//wait for next TV frame
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|
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spr=0;
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|
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for(i=0;i<BALLS_MAX;++i)
|
|
{
|
|
//set a sprite for current ball
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|
|
|
spr=oam_spr(ball_x[i],ball_y[i],0x40,i&3,spr);//0x40 is tile number, i&3 is palette
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|
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//move the ball
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|
|
ball_x[i]+=ball_dx[i];
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|
ball_y[i]+=ball_dy[i];
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|
|
//bounce the ball off the edges
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|
|
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if(ball_x[i]>=(256-8)) ball_dx[i]=-ball_dx[i];
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if(ball_y[i]>=(240-8)) ball_dy[i]=-ball_dy[i];
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}
|
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}
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}
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