491 lines
16 KiB
C
491 lines
16 KiB
C
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#include <string.h>
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typedef unsigned char byte;
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typedef unsigned short word;
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byte __at (0xc000) palette[16];
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volatile byte __at (0xc800) input0;
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volatile byte __at (0xc802) input1;
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volatile byte __at (0xc804) input2;
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byte __at (0xc900) rom_select;
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volatile byte __at (0xcb00) video_counter;
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byte __at (0xcbff) watchdog0x39;
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byte __at (0xcc00) nvram[0x400];
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// blitter flags
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#define SRCSCREEN 0x1
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#define DSTSCREEN 0x2
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#define ESYNC 0x4
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#define FGONLY 0x8
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#define SOLID 0x10
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#define RSHIFT 0x20
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#define EVENONLY 0x40
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#define ODDONLY 0x80
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struct {
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byte flags;
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byte solid;
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word sstart;
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word dstart;
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byte width;
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byte height;
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} __at (0xca00) blitter;
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byte __at (0x0) vidmem[128][304]; // 256x304x4bpp video memory
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void main();
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// start routine @ 0x0
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// set stack pointer, enable interrupts
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void start() {
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__asm
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LD SP,#0xc000
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DI
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; copy initialized data
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LD BC, #l__INITIALIZER
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LD A, B
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LD DE, #s__INITIALIZED
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LD HL, #s__INITIALIZER
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LDIR
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__endasm;
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main();
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}
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#define LOCHAR 0x21
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#define HICHAR 0x5e
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const byte font8x8[HICHAR-LOCHAR+1][8] = {
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{ 0x18,0x18,0x18,0x18,0x00,0x00,0x18,0x00 }, { 0x66,0x66,0x66,0x00,0x00,0x00,0x00,0x00 }, { 0x66,0x66,0xff,0x66,0xff,0x66,0x66,0x00 }, { 0x18,0x3e,0x60,0x3c,0x06,0x7c,0x18,0x00 }, { 0x62,0x66,0x0c,0x18,0x30,0x66,0x46,0x00 }, { 0x3c,0x66,0x3c,0x38,0x67,0x66,0x3f,0x00 }, { 0x06,0x0c,0x18,0x00,0x00,0x00,0x00,0x00 }, { 0x0c,0x18,0x30,0x30,0x30,0x18,0x0c,0x00 }, { 0x30,0x18,0x0c,0x0c,0x0c,0x18,0x30,0x00 }, { 0x00,0x66,0x3c,0xff,0x3c,0x66,0x00,0x00 }, { 0x00,0x18,0x18,0x7e,0x18,0x18,0x00,0x00 }, { 0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x30 }, { 0x00,0x00,0x00,0x7e,0x00,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00 }, { 0x00,0x03,0x06,0x0c,0x18,0x30,0x60,0x00 }, { 0x3c,0x66,0x6e,0x76,0x66,0x66,0x3c,0x00 }, { 0x18,0x18,0x38,0x18,0x18,0x18,0x7e,0x00 }, { 0x3c,0x66,0x06,0x0c,0x30,0x60,0x7e,0x00 }, { 0x3c,0x66,0x06,0x1c,0x06,0x66,0x3c,0x00 }, { 0x06,0x0e,0x1e,0x66,0x7f,0x06,0x06,0x00 }, { 0x7e,0x60,0x7c,0x06,0x06,0x66,0x3c,0x00 }, { 0x3c,0x66,0x60,0x7c,0x66,0x66,0x3c,0x00 }, { 0x7e,0x66,0x0c,0x18,0x18,0x18,0x18,0x00 }, { 0x3c,0x66,0x66,0x3c,0x66,0x66,0x3c,0x00 }, { 0x3c,0x66,0x66,0x3e,0x06,0x66,0x3c,0x00 }, { 0x00,0x00,0x18,0x00,0x00,0x18,0x00,0x00 }, { 0x00,0x00,0x18,0x00,0x00,0x18,0x18,0x30 }, { 0x0e,0x18,0x30,0x60,0x30,0x18,0x0e,0x00 }, { 0x00,0x00,0x7e,0x00,0x7e,0x00,0x00,0x00 }, { 0x70,0x18,0x0c,0x06,0x0c,0x18,0x70,0x00 }, { 0x3c,0x66,0x06,0x0c,0x18,0x00,0x18,0x00 }, { 0x3c,0x66,0x6e,0x6e,0x60,0x62,0x3c,0x00 }, { 0x18,0x3c,0x66,0x7e,0x66,0x66,0x66,0x00 }, { 0x7c,0x66,0x66,0x7c,0x66,0x66,0x7c,0x00 }, { 0x3c,0x66,0x60,0x60,0x60,0x66,0x3c,0x00 }, { 0x78,0x6c,0x66,0x66,0x66,0x6c,0x78,0x00 }, { 0x7e,0x60,0x60,0x78,0x60,0x60,0x7e,0x00 }, { 0x7e,0x60,0x60,0x78,0x60,0x60,0x60,0x00 }, { 0x3c,0x66,0x60,0x6e,0x66,0x66,0x3c,0x00 }, { 0x66,0x66,0x66,0x7e,0x66,0x66,0x66,0x00 }, { 0x3c,0x18,0x18,0x18,0x18,0x18,0x3c,0x00 }, { 0x1e,0x0c,0x0c,0x0c,0x0c,0x6c,0x38,0x00 }, { 0x66,0x6c,0x78,0x70,0x78,0x6c,0x66,0x00 }, { 0x60,0x60,0x60,0x60,0x60,0x60,0x7e,0x00 }, { 0x63,0x77,0x7f,0x6b,0x63,0x63,0x63,0x00 }, { 0x66,0x76,0x7e,0x7e,0x6e,0x66,0x66,0x00 }, { 0x3c,0x66,0x66,0x66,0x66,0x66,0x3c,0x00 }, { 0x7c,0x66,0x66,0x7c,0x60,0x60,0x60,0x00 }, { 0x3c,0x66,0x66,0x66,0x66,0x3c,0x0e,0x00 }, { 0x7c,0x66,0x66,0x7c,0x78,0x6c,0x66,0x00 }, { 0x3c,0x66,0x60,0x3c,0x06,0x66,0x3c,0x00 }, { 0x7e,0x18,0x18,0x18,0x18,0x18,0x18,0x00 }, { 0x66,0x66,0x66,0x66,0x66,0x66,0x3c,0x00 }, { 0x66,0x66,0x66,0x66,0x66,0x3c,0x18,0x00 }, { 0x63,0x63,0x63,0x6b,0x7f,0x77,0x63,0x00 }, { 0x66,0x66,0x3c,0x18,0x3c,0x66,0x66,0x00 }, { 0x66,0x66,0x66,0x3c,0x18,0x18,0x18,0x00 }, { 0x7e,0x06,0x0c,0x18,0x30,0x60,0x7e,0x00 }, { 0x3c,0x30,0x30,0x30,0x30,0x30,0x3c,0x00 }, { 0x00,0x60,0x30,0x18,0x0c,0x06,0x03,0x00 }, { 0x3c,0x0c,0x0c,0x0c,0x0c,0x0c,0x3c,0x00 }, { 0x00,0x18,0x3c,0x7e,0x18,0x18,0x18,0x18 }
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};
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static byte font_table[HICHAR-LOCHAR+1][8*4];
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void fill_char_table_entry(char ch) {
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const byte* src = &font8x8[ch-LOCHAR][0];
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byte* data = &font_table[ch-LOCHAR][0];
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int i,j,pixels;
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for (i=0; i<8; i++) {
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byte b = *src++;
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for (j=0; j<4; j++) {
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pixels = 0;
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if (b & 0x80) pixels |= 0xf0;
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if (b & 0x40) pixels |= 0x0f;
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*data++ = pixels;
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b <<= 2;
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}
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}
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}
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void fill_char_table() {
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char ch;
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for (ch=LOCHAR; ch<=HICHAR; ch++) {
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fill_char_table_entry(ch);
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}
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}
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const byte palette_data[16] = {
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0x00, 0x03, 0x19, 0x50, 0x52, 0x07, 0x1f, 0x37, 0xe0, 0xa4, 0xfd, 0xff, 0x00, 0x00, 0x00, 0xf8, };
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const byte sprite1[2+16*16/2] = {
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8,16,
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0x00,0x09,0x99,0x00,0x00,0x99,0x90,0x00,
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0x00,0x94,0x94,0x90,0x09,0x49,0x49,0x00,
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0x04,0x49,0x49,0x90,0x09,0x94,0x94,0x90,
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0x94,0x99,0x94,0x90,0x09,0x49,0x99,0x49,
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0x99,0x99,0x49,0x93,0x39,0x94,0x99,0x99,
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0x04,0x49,0x99,0x94,0x49,0x99,0x94,0x90,
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0x00,0x94,0x94,0x43,0x34,0x49,0x49,0x00,
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0x00,0x09,0x43,0x94,0x49,0x34,0x90,0x00,
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0x00,0x90,0x00,0x39,0x93,0x00,0x09,0x00,
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0x00,0x09,0x83,0x33,0x33,0x33,0x90,0x00,
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0x00,0x09,0x32,0x23,0x32,0x23,0x90,0x00,
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0x00,0x03,0x03,0x23,0x82,0x30,0x30,0x00,
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0x03,0x30,0x00,0x33,0x33,0x00,0x03,0x30,
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0x00,0x30,0x03,0x00,0x00,0x30,0x03,0x00,
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0x00,0x00,0x00,0x30,0x03,0x00,0x00,0x00,
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0x00,0x09,0x99,0x00,0x00,0x99,0x90,0x00,
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};
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const byte sprite2[2+16*16/2] = {
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8,16,
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0x00,0x94,0x94,0x90,0x09,0x49,0x49,0x00,
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0x04,0x49,0x49,0x90,0x09,0x94,0x94,0x90,
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0x94,0x99,0x94,0x90,0x09,0x49,0x99,0x49,
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0x99,0x99,0x49,0x93,0x39,0x94,0x99,0x99,
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0x04,0x49,0x99,0x94,0x49,0x99,0x94,0x90,
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0x00,0x94,0x94,0x43,0x34,0x49,0x49,0x00,
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0x00,0x09,0x43,0x94,0x49,0x34,0x90,0x00,
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0x00,0x90,0x00,0x39,0x93,0x00,0x09,0x00,
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0x00,0x09,0x83,0x33,0x33,0x33,0x90,0x00,
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0x00,0x09,0x32,0x23,0x32,0x23,0x90,0x00,
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0x00,0x03,0x03,0x23,0x82,0x30,0x30,0x00,
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0x03,0x30,0x00,0x33,0x33,0x00,0x03,0x30,
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0x00,0x30,0x03,0x00,0x00,0x30,0x03,0x00,
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0x00,0x00,0x00,0x30,0x03,0x00,0x00,0x00,
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0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,
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};
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const byte sprite3[2+16*16/2] = {
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8,16,
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0x00,0x00,0x00,0x01,0x10,0x00,0x00,0x00,
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0x00,0x00,0x00,0x11,0x11,0x00,0x00,0x00,
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0x00,0x00,0x00,0x01,0x10,0x00,0x00,0x00,
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0x00,0x00,0x00,0x01,0x10,0x00,0x00,0x00,
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0x00,0x11,0x10,0x01,0x10,0x01,0x11,0x00,
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0x11,0x00,0x10,0x11,0x11,0x01,0x00,0x11,
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0x10,0x00,0x11,0x11,0x11,0x11,0x00,0x01,
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0x10,0x00,0x00,0x11,0x11,0x00,0x00,0x01,
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0x00,0x01,0x10,0x11,0x41,0x01,0x10,0x00,
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0x00,0x10,0x11,0x11,0x11,0x11,0x01,0x00,
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0x01,0x00,0x00,0x51,0x15,0x00,0x00,0x10,
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0x01,0x00,0x01,0x10,0x01,0x10,0x00,0x10,
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0x01,0x00,0x10,0x00,0x00,0x01,0x00,0x10,
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0x00,0x10,0x01,0x00,0x00,0x10,0x01,0x00,
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0x00,0x10,0x00,0x00,0x00,0x00,0x01,0x00,
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0x00,0x01,0x10,0x00,0x00,0x01,0x10,0x00,
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};
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const byte sprite4[2+16*16/2] = {
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8,16,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0xbb,0xbb,0x00,0x00,0x00,
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0x00,0x00,0x00,0xbb,0xbb,0x00,0x00,0x00,
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0x00,0x00,0xbb,0xbb,0xbb,0xbb,0x00,0x00,
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0x00,0x0b,0x4b,0xbb,0xbb,0xb4,0xb0,0x00,
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0x00,0x0b,0x44,0xbb,0xbb,0x49,0xb0,0x00,
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0x00,0xbb,0x99,0x4b,0xb4,0x99,0xbb,0x00,
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0x00,0x4b,0xb9,0x9b,0xb4,0x4b,0xb4,0x00,
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0x00,0x04,0xbb,0x4b,0xb9,0xbb,0x40,0x00,
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0x00,0x00,0x4b,0xbb,0xbb,0xb4,0x00,0x00,
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0x11,0x00,0x0b,0xbb,0xbb,0xb0,0x00,0x11,
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0x10,0x10,0x0b,0x41,0x14,0xb0,0x01,0x01,
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0x10,0x00,0x05,0x11,0x11,0x50,0x00,0x01,
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0x01,0x00,0x01,0x51,0x15,0x10,0x00,0x10,
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0x00,0x10,0x01,0x10,0x01,0x10,0x01,0x00,
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0x01,0x01,0x10,0x10,0x01,0x01,0x10,0x10,
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};
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const byte sprite5[2+16*16/2] = {
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8,16,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x22,0x00,0x00,0x22,0x00,0x00,
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0x00,0x20,0x20,0x00,0x00,0x02,0x02,0x00,
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0x02,0x22,0x12,0x00,0x00,0x21,0x22,0x20,
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0x00,0x02,0x11,0x00,0x00,0x11,0x20,0x00,
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0x00,0x00,0x02,0x11,0x11,0x20,0x00,0x00,
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0x00,0x00,0x02,0x22,0x22,0x20,0x00,0x00,
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0x00,0x00,0x21,0x22,0x22,0x12,0x00,0x00,
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0x00,0x00,0x22,0x12,0x21,0x22,0x00,0x00,
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0x02,0x00,0x22,0x12,0x21,0x22,0x00,0x20,
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0x20,0x02,0x21,0x11,0x11,0x12,0x20,0x02,
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0x02,0x22,0x15,0x12,0x21,0x51,0x22,0x20,
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0x02,0x11,0x15,0x52,0x25,0x51,0x11,0x20,
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0x20,0x00,0x22,0x12,0x21,0x22,0x00,0x02,
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0x20,0x02,0x20,0x20,0x02,0x02,0x20,0x02,
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0x02,0x02,0x00,0x20,0x02,0x00,0x20,0x20,
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};
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const byte sprite6[2+12*16/2] = {
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8,12,
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0x00,0x00,0x00,0x00,0x04,0x04,0x04,0x00,
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0x00,0x00,0x00,0x00,0x44,0x44,0x44,0x40,
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0x00,0x00,0x04,0x04,0x49,0x49,0x99,0x44,
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0x00,0x00,0x44,0x44,0x99,0x94,0x44,0x40,
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0x00,0x04,0x49,0x99,0x94,0x49,0x99,0x40,
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0x00,0x44,0x99,0x94,0x49,0x99,0x44,0x00,
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0x04,0x49,0x44,0x99,0x99,0x44,0x00,0x00,
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0x04,0x44,0x00,0x49,0x44,0x40,0x00,0x00,
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0x04,0x40,0x00,0x04,0x00,0x00,0x00,0x00,
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0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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};
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const byte sprite7[2+16*16/2] = {
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8,16,
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0x00,0x60,0x00,0x00,0x00,0x00,0x06,0x00,
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0x60,0x60,0x00,0x00,0x00,0x00,0x06,0x06,
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0x60,0x60,0x50,0x00,0x00,0x05,0x06,0x06,
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0x60,0x60,0x06,0x00,0x00,0x60,0x06,0x06,
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0x66,0x60,0x06,0x06,0x60,0x60,0x06,0x66,
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0x66,0x60,0x66,0x66,0x66,0x66,0x06,0x66,
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0x66,0x60,0x6b,0x6b,0xb6,0xb6,0x06,0x66,
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0x06,0x66,0x66,0xb6,0x6b,0x66,0x66,0x60,
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0x00,0x67,0x66,0x66,0x66,0x66,0x66,0x00,
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0x00,0x11,0x11,0x66,0x66,0x11,0x11,0x00,
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0x01,0x11,0x21,0x11,0x11,0x12,0x11,0x10,
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0x00,0x10,0x01,0x01,0x10,0x10,0x01,0x00,
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0x00,0x10,0x11,0x00,0x00,0x11,0x01,0x00,
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0x00,0x00,0x10,0x00,0x00,0x01,0x00,0x00,
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};
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const byte sprite8[2+16*16/2] = {
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8,16,
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0x00,0x00,0x11,0x11,0x11,0x11,0x00,0x00,
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0x00,0x01,0x61,0x11,0x21,0x12,0x10,0x00,
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0x00,0x11,0x12,0x11,0x61,0x11,0x11,0x00,
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0x00,0x11,0x71,0x21,0x61,0x17,0x11,0x00,
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0x00,0x11,0x77,0x11,0x12,0x77,0x11,0x00,
|
|
0x00,0x11,0x17,0x17,0x71,0x72,0x11,0x00,
|
|
0x00,0x16,0x21,0x78,0x87,0x11,0x11,0x00,
|
|
0x00,0x01,0x81,0x88,0x88,0x18,0x10,0x00,
|
|
0x00,0x08,0x18,0x58,0x85,0x81,0x80,0x00,
|
|
0x00,0x88,0x01,0x88,0x88,0x10,0x88,0x00,
|
|
0x00,0x08,0x07,0x78,0x87,0x70,0x80,0x00,
|
|
0x08,0x80,0x07,0x80,0x08,0x70,0x08,0x80,
|
|
0x88,0x00,0x88,0x00,0x00,0x88,0x00,0x88,
|
|
0x80,0x00,0x08,0x80,0x08,0x80,0x00,0x08,
|
|
0x00,0x00,0x00,0x80,0x08,0x00,0x00,0x00,
|
|
};
|
|
|
|
const byte sprite9[2+13*16/2] = {
|
|
8,13,
|
|
0x00,0x00,0xaa,0x00,0x00,0xaa,0x00,0x00,
|
|
0x00,0x00,0xa0,0x0a,0xa0,0x0a,0x00,0x00,
|
|
0x0a,0xaa,0xa4,0xaa,0xaa,0x3a,0xaa,0xa0,
|
|
0x00,0x0a,0x3a,0x9a,0xa9,0xa3,0xa0,0x00,
|
|
0x00,0x0a,0xaa,0x99,0xa4,0xaa,0xa0,0x00,
|
|
0x00,0x0a,0xaa,0x99,0x94,0xaa,0xa0,0x00,
|
|
0x00,0xaa,0x33,0xaa,0xaa,0x43,0xaa,0x00,
|
|
0x0a,0x3a,0xaa,0x3a,0xa3,0xaa,0xa3,0xa0,
|
|
0x00,0xaa,0xaa,0x30,0x03,0xaa,0xaa,0x00,
|
|
0x00,0x0a,0xa0,0x30,0x03,0x0a,0xa0,0x00,
|
|
0x00,0xa3,0xa0,0x00,0x00,0x0a,0x4a,0x00,
|
|
0x00,0xaa,0xa0,0x00,0x00,0x0a,0xaa,0x00,
|
|
0x00,0x0a,0xa0,0x00,0x00,0x0a,0xa0,0x00,
|
|
};
|
|
|
|
const byte* const all_sprites[9] = {
|
|
sprite1,
|
|
sprite2,
|
|
sprite3,
|
|
sprite4,
|
|
sprite5,
|
|
sprite6,
|
|
sprite7,
|
|
sprite8,
|
|
sprite9,
|
|
};
|
|
|
|
inline word swapw(word j) {
|
|
return ((j << 8) | (j >> 8));
|
|
}
|
|
|
|
// x1: 0-151
|
|
// y1: 0-255
|
|
inline void blit_solid(byte x1, byte y1, byte w, byte h, byte color) {
|
|
blitter.width = w^4;
|
|
blitter.height = h^4;
|
|
blitter.dstart = x1+y1*256; // swapped
|
|
blitter.solid = color;
|
|
blitter.flags = DSTSCREEN|SOLID;
|
|
}
|
|
|
|
inline void blit_copy(byte x1, byte y1, byte w, byte h, const byte* data) {
|
|
blitter.width = w^4;
|
|
blitter.height = h^4;
|
|
blitter.sstart = swapw((word)data);
|
|
blitter.dstart = x1+y1*256; // swapped
|
|
blitter.flags = DSTSCREEN|FGONLY;
|
|
}
|
|
|
|
inline void blit_copy_solid(byte x1, byte y1, byte w, byte h, const byte* data, byte solid) {
|
|
blitter.width = w^4;
|
|
blitter.height = h^4;
|
|
blitter.sstart = swapw((word)data);
|
|
blitter.dstart = x1+y1*256; // swapped
|
|
blitter.solid = solid;
|
|
blitter.flags = DSTSCREEN|FGONLY|SOLID;
|
|
}
|
|
|
|
inline void draw_sprite(const byte* data, byte x, byte y) {
|
|
blitter.width = data[0]^4;
|
|
blitter.height = data[1]^4;
|
|
blitter.sstart = swapw((word)(data+2));
|
|
blitter.dstart = x+y*256; // swapped
|
|
blitter.flags = DSTSCREEN|FGONLY;
|
|
}
|
|
|
|
inline void draw_sprite_solid(const byte* data, byte x, byte y, byte color) {
|
|
blitter.width = data[0]^4;
|
|
blitter.height = data[1]^4;
|
|
blitter.sstart = swapw((word)(data+2));
|
|
blitter.dstart = x+y*256; // swapped
|
|
blitter.solid = color;
|
|
blitter.flags = DSTSCREEN|FGONLY|SOLID;
|
|
}
|
|
|
|
inline void erase_sprite_rect(const byte* data, byte x, byte y) {
|
|
blitter.width = data[0]^4;
|
|
blitter.height = data[1]^4;
|
|
blitter.dstart = x+y*256; // swapped
|
|
blitter.solid = 0;
|
|
blitter.flags = DSTSCREEN|SOLID;
|
|
}
|
|
|
|
inline void draw_sprite_strided(const byte* data, byte x, byte y, byte stride) {
|
|
const byte* src = data+2;
|
|
byte height = data[1]^4;
|
|
byte width = data[0]^4;
|
|
while (height--) {
|
|
blit_copy(x, y, width, 1, src);
|
|
y += stride;
|
|
src += width;
|
|
}
|
|
}
|
|
|
|
inline void draw_char(char ch, byte x, byte y, byte color) {
|
|
if (ch < LOCHAR || ch > HICHAR) return;
|
|
blit_copy_solid(x, y, 4, 8, font_table[ch - LOCHAR], color);
|
|
}
|
|
|
|
void draw_string(const char* str, byte x, byte y, byte color) {
|
|
while (*str) {
|
|
draw_char(*str++, x, y, color);
|
|
x += 4;
|
|
}
|
|
}
|
|
|
|
typedef struct Actor* a;
|
|
|
|
typedef void ActorUpdateFn(struct Actor* a);
|
|
typedef void ActorDrawFn(struct Actor* a);
|
|
|
|
typedef struct Actor {
|
|
byte grid_index;
|
|
byte next_actor;
|
|
byte x,y;
|
|
byte* shape;
|
|
ActorUpdateFn* update;
|
|
ActorDrawFn* draw;
|
|
} Actor;
|
|
|
|
#define GBITS 3
|
|
#define GDIM (1<<GBITS)
|
|
#define MAX_ACTORS 256
|
|
|
|
static byte grid[GDIM*GDIM]; // should be 256
|
|
static Actor actors[MAX_ACTORS];
|
|
|
|
inline byte xy2grid(byte x, byte y) {
|
|
return (x >> (8-GBITS)) | (y & ((GDIM-1) << GBITS));
|
|
}
|
|
|
|
void insert_into_grid(byte gi, byte actor_index) {
|
|
struct Actor* a = &actors[actor_index];
|
|
a->grid_index = gi;
|
|
a->next_actor = grid[gi];
|
|
grid[gi] = actor_index;
|
|
}
|
|
|
|
void delete_from_grid(byte gi, byte actor_index) {
|
|
byte i = grid[gi];
|
|
byte next = actors[actor_index].next_actor;
|
|
// is actor to delete at head of list?
|
|
if (i == actor_index) {
|
|
grid[gi] = next;
|
|
} else {
|
|
// iterate through the list
|
|
do {
|
|
byte j = actors[i].next_actor;
|
|
if (j == actor_index) {
|
|
actors[i].next_actor = next;
|
|
break;
|
|
}
|
|
i = j;
|
|
} while (1); // watchdog reset if actor not found to delete
|
|
}
|
|
actors[actor_index].next_actor = 0;
|
|
actors[actor_index].grid_index = 0;
|
|
}
|
|
|
|
void draw_actor_debug(struct Actor* a) {
|
|
draw_sprite_solid(a->shape, a->x, a->y, a->next_actor?0xff:0x33);
|
|
}
|
|
|
|
byte update_actor(byte actor_index) {
|
|
struct Actor* a = &actors[actor_index];
|
|
byte next_actor;
|
|
byte gi0,gi1;
|
|
if (!a->shape) return 0;
|
|
next_actor = a->next_actor;
|
|
gi0 = a->grid_index;
|
|
draw_sprite_solid(a->shape, a->x, a->y, 0);
|
|
if (a->update) a->update(a);
|
|
if (a->draw) a->draw(a);
|
|
//draw_sprite_strided(a->shape, a->x, a->y, 2);
|
|
gi1 = xy2grid(a->x, a->y);
|
|
if (gi0 != gi1) {
|
|
delete_from_grid(gi0, actor_index);
|
|
insert_into_grid(gi1, actor_index);
|
|
}
|
|
return next_actor;
|
|
}
|
|
|
|
//
|
|
|
|
word lfsr = 1;
|
|
|
|
word rand() {
|
|
byte lsb = lfsr & 1;
|
|
lfsr >>= 1;
|
|
if (lsb) lfsr ^= 0xd400;
|
|
return lfsr;
|
|
}
|
|
|
|
signed char random_dir() {
|
|
byte x = rand();
|
|
if (x < 85) return 0;
|
|
else if (x < 85*2) return -1;
|
|
else return 1;
|
|
}
|
|
|
|
void random_walk(Actor* a) {
|
|
a->x += random_dir();
|
|
a->y += random_dir();
|
|
}
|
|
|
|
void update_grid_cell(byte grid_index) {
|
|
byte actor_index = grid[grid_index];
|
|
while (actor_index) {
|
|
actor_index = update_actor(actor_index);
|
|
}
|
|
}
|
|
|
|
void update_grid_rows(byte row_start, byte row_end) {
|
|
byte i0 = row_start * GDIM;
|
|
byte i1 = row_end * GDIM;
|
|
byte i;
|
|
for (i=i0; i!=i1; i++) {
|
|
update_grid_cell(i);
|
|
}
|
|
}
|
|
|
|
void main() {
|
|
byte i;
|
|
byte num_actors = 32;
|
|
blit_solid(0, 0, 255, 255, 0);
|
|
memset(grid, 0, sizeof(grid));
|
|
memset(actors, 0, sizeof(actors));
|
|
memcpy(palette, palette_data, 16);
|
|
fill_char_table();
|
|
for (i=1; i<num_actors; i++) {
|
|
Actor* a = &actors[i];
|
|
a->x = (i & 3) * 16 + 32;
|
|
a->y = (i / 4) * 16 + 64;
|
|
a->shape = (void*) all_sprites[i%9];
|
|
a->update = random_walk;
|
|
a->draw = draw_actor_debug;
|
|
insert_into_grid(xy2grid(a->x, a->y), i);
|
|
watchdog0x39 = 0x39;
|
|
}
|
|
while (1) {
|
|
// update top half while drawing bottom half
|
|
while (video_counter < 0x80) ;
|
|
update_grid_rows(0,GDIM/2);
|
|
// update bottom half while drawing top half
|
|
while (video_counter >= 0x80) ;
|
|
update_grid_rows(GDIM/2,GDIM);
|
|
watchdog0x39 = 0x39;
|
|
}
|
|
}
|