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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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//this example code shows how to put some text in nametable
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#include "neslib.h"
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//#link "jroatch.c"
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extern unsigned char jroatch_chr[0x1000];
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#define TILESET jroatch_chr
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//this macro is used remove need of calculation of the nametable address in runtime
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#define NTADR(x,y) ((0x2000|((y)<<5)|x))
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//put a string into the nametable
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void put_str(unsigned int adr,const char *str)
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{
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vram_adr(adr);
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while(1)
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{
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if(!*str) break;
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vram_put((*str++));
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}
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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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//rendering is disabled at the startup, and palette is all black
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pal_col(1,0x04);
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pal_col(2,0x20);
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pal_col(3,0x30);
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//you can't put data into vram through vram_put while rendering is enabled
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//so you have to disable rendering to put things like text or a level map
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//into the nametable
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//there is a way to update small number of nametable tiles while rendering
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//is enabled, using set_vram_update and an update list
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put_str(NTADR(2,2),"HELLO, WORLD!");
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put_str(NTADR(2,4),"THIS CODE PRINTS SOME TEXT");
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put_str(NTADR(2,5),"USING ASCII-ENCODED CHARACTER");
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put_str(NTADR(2,6),"SET WITH CAPITAL LETTERS ONLY");
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ppu_on_all();//enable rendering
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while(1);//do nothing, infinite loop
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}
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