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52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
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Setting the attribute table, which controls palette selection
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for the nametable. We copy it from an array in ROM to video RAM.
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*/
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#include "neslib.h"
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#include <string.h>
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#include <stdlib.h>
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// link the pattern table into CHR ROM
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//#link "chr_generic.s"
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// attribute table in PRG ROM
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const char ATTRIBUTE_TABLE[0x40] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // rows 0-3
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0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, // rows 4-7
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0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, // rows 8-11
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // rows 12-15
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // rows 16-19
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, // rows 20-23
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, // rows 24-27
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f // rows 28-29
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};
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/*{pal:"nes",layout:"nes"}*/
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const char PALETTE[16] = {
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0x03, // screen color
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0x11,0x30,0x27,0x0, // background palette 0
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0x1c,0x20,0x2c,0x0, // background palette 1
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0x00,0x10,0x20,0x0, // background palette 2
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0x06,0x16,0x26 // background palette 3
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};
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// main function, run after console reset
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void main(void) {
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// set background palette colors
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pal_bg(PALETTE);
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// fill nametable with diamonds
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vram_adr(NAMETABLE_A); // start address ($2000)
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vram_fill(0x16, 32*30); // fill nametable (960 bytes)
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// copy attribute table from PRG ROM to VRAM
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vram_write(ATTRIBUTE_TABLE, sizeof(ATTRIBUTE_TABLE));
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// enable PPU rendering (turn on screen)
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ppu_on_all();
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// infinite loop
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while (1) { }
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}
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