mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-25 18:33:11 +00:00
447 lines
12 KiB
C
447 lines
12 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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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,
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0x00,0x11,0x17,0x17,0x71,0x72,0x11,0x00,
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0x00,0x16,0x21,0x78,0x87,0x11,0x11,0x00,
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0x00,0x01,0x81,0x88,0x88,0x18,0x10,0x00,
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0x00,0x08,0x18,0x58,0x85,0x81,0x80,0x00,
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0x00,0x88,0x01,0x88,0x88,0x10,0x88,0x00,
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0x00,0x08,0x07,0x78,0x87,0x70,0x80,0x00,
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0x08,0x80,0x07,0x80,0x08,0x70,0x08,0x80,
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0x88,0x00,0x88,0x00,0x00,0x88,0x00,0x88,
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0x80,0x00,0x08,0x80,0x08,0x80,0x00,0x08,
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0x00,0x00,0x00,0x80,0x08,0x00,0x00,0x00,
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};
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const byte sprite9[2+13*16/2] = {
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8,13,
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0x00,0x00,0xaa,0x00,0x00,0xaa,0x00,0x00,
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0x00,0x00,0xa0,0x0a,0xa0,0x0a,0x00,0x00,
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0x0a,0xaa,0xa4,0xaa,0xaa,0x3a,0xaa,0xa0,
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0x00,0x0a,0x3a,0x9a,0xa9,0xa3,0xa0,0x00,
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0x00,0x0a,0xaa,0x99,0xa4,0xaa,0xa0,0x00,
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0x00,0x0a,0xaa,0x99,0x94,0xaa,0xa0,0x00,
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0x00,0xaa,0x33,0xaa,0xaa,0x43,0xaa,0x00,
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0x0a,0x3a,0xaa,0x3a,0xa3,0xaa,0xa3,0xa0,
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0x00,0xaa,0xaa,0x30,0x03,0xaa,0xaa,0x00,
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0x00,0x0a,0xa0,0x30,0x03,0x0a,0xa0,0x00,
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0x00,0xa3,0xa0,0x00,0x00,0x0a,0x4a,0x00,
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0x00,0xaa,0xa0,0x00,0x00,0x0a,0xaa,0x00,
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0x00,0x0a,0xa0,0x00,0x00,0x0a,0xa0,0x00,
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};
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const byte* const all_sprites[9] = {
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sprite1,
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sprite2,
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sprite3,
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sprite4,
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sprite5,
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sprite6,
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sprite7,
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sprite8,
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sprite9,
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};
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inline word swapw(word j) {
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return ((j << 8) | (j >> 8));
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}
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// x1: 0-151
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// y1: 0-255
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inline void blit_solid(byte x1, byte y1, byte w, byte h, byte color) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.dstart = x1+y1*256; // swapped
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blitter.solid = color;
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blitter.flags = DSTSCREEN|SOLID;
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}
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inline void blit_copy(byte x1, byte y1, byte w, byte h, const byte* data) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.sstart = swapw((word)data);
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blitter.dstart = x1+y1*256; // swapped
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blitter.flags = DSTSCREEN|FGONLY;
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}
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inline void blit_copy_solid(byte x1, byte y1, byte w, byte h, const byte* data, byte solid) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.sstart = swapw((word)data);
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blitter.dstart = x1+y1*256; // swapped
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blitter.solid = solid;
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blitter.flags = DSTSCREEN|FGONLY|SOLID;
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}
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inline void draw_sprite(const byte* data, byte x, byte y) {
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blitter.width = data[0]^4;
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blitter.height = data[1]^4;
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blitter.sstart = swapw((word)(data+2));
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blitter.dstart = x+y*256; // swapped
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blitter.flags = DSTSCREEN|FGONLY;
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}
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inline void draw_sprite_solid(const byte* data, byte x, byte y, byte color) {
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blitter.width = data[0]^4;
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blitter.height = data[1]^4;
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blitter.sstart = swapw((word)(data+2));
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blitter.dstart = x+y*256; // swapped
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blitter.solid = color;
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blitter.flags = DSTSCREEN|FGONLY|SOLID;
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}
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inline void erase_sprite_rect(const byte* data, byte x, byte y) {
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blitter.width = data[0]^4;
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blitter.height = data[1]^4;
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blitter.dstart = x+y*256; // swapped
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blitter.solid = 0;
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blitter.flags = DSTSCREEN|SOLID;
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}
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inline void draw_sprite_strided(const byte* data, byte x, byte y, byte stride) {
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const byte* src = data+2;
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byte height = data[1]^4;
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byte width = data[0]^4;
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while (height--) {
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blit_copy(x, y, width, 1, src);
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y += stride;
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src += width;
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}
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}
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typedef struct Actor* a;
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typedef void ActorUpdateFn(struct Actor* a);
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typedef void ActorDrawFn(struct Actor* a);
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typedef void ActorEnumerateFn(struct Actor* a);
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typedef struct Actor {
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byte grid_index;
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byte next_actor;
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byte x,y;
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byte* shape;
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ActorUpdateFn* update;
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ActorDrawFn* draw;
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} Actor;
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#define GBITS 3
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#define GDIM (1<<GBITS)
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#define MAX_ACTORS 256
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static byte grid[GDIM*GDIM]; // should be 256
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static Actor actors[MAX_ACTORS];
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inline byte xy2grid(byte x, byte y) {
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return (x >> (8-GBITS)) | (y & ((GDIM-1) << GBITS));
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}
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void insert_into_grid(byte gi, byte actor_index) {
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struct Actor* a = &actors[actor_index];
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a->grid_index = gi;
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a->next_actor = grid[gi];
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grid[gi] = actor_index;
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}
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void delete_from_grid(byte gi, byte actor_index) {
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byte i = grid[gi];
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byte next = actors[actor_index].next_actor;
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// is actor to delete at head of list?
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if (i == actor_index) {
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grid[gi] = next;
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} else {
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// iterate through the list
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do {
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byte j = actors[i].next_actor;
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if (j == actor_index) {
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actors[i].next_actor = next;
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break;
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}
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i = j;
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} while (1); // watchdog reset if actor not found to delete
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}
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actors[actor_index].next_actor = 0;
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actors[actor_index].grid_index = 0;
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}
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void draw_actor_debug(struct Actor* a) {
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draw_sprite_solid(a->shape, a->x, a->y, a->next_actor?0xff:0x33);
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}
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byte update_actor(byte actor_index) {
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struct Actor* a = &actors[actor_index];
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byte next_actor;
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byte gi0,gi1;
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if (!a->shape) return 0;
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next_actor = a->next_actor;
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gi0 = a->grid_index;
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draw_sprite_solid(a->shape, a->x, a->y, 0);
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if (a->update) a->update(a);
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if (a->draw) a->draw(a);
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//draw_sprite_strided(a->shape, a->x, a->y, 2);
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gi1 = xy2grid(a->x, a->y);
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if (gi0 != gi1) {
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delete_from_grid(gi0, actor_index);
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insert_into_grid(gi1, actor_index);
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}
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return next_actor;
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}
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//
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word lfsr = 1;
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word rand() {
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byte lsb = lfsr & 1;
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lfsr >>= 1;
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if (lsb) lfsr ^= 0xd400;
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return lfsr;
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}
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signed char random_dir() {
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byte x = rand();
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if (x < 85) return 0;
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else if (x < 85*2) return -1;
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else return 1;
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}
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void random_walk(Actor* a) {
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a->x += random_dir();
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a->y += random_dir();
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}
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void update_grid_cell(byte grid_index) {
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byte actor_index = grid[grid_index];
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while (actor_index) {
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actor_index = update_actor(actor_index);
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}
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}
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void update_grid_rows(byte row_start, byte row_end) {
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byte i0 = row_start * GDIM;
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byte i1 = row_end * GDIM;
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byte i;
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for (i=i0; i!=i1; i++) {
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update_grid_cell(i);
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}
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}
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void main() {
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byte i;
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byte num_actors = 32;
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blit_solid(0, 0, 255, 255, 0);
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memset(grid, 0, sizeof(grid));
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memset(actors, 0, sizeof(actors));
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memcpy(palette, palette_data, 16);
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for (i=1; i<num_actors; i++) {
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Actor* a = &actors[i];
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a->x = (i & 3) * 16 + 32;
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a->y = (i / 4) * 16 + 64;
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a->shape = (void*) all_sprites[i%9];
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a->update = random_walk;
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a->draw = draw_actor_debug;
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insert_into_grid(xy2grid(a->x, a->y), i);
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watchdog0x39 = 0x39;
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}
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while (1) {
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// update top half while drawing bottom half
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while (video_counter < 0x80) ;
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update_grid_rows(0,GDIM/2);
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// update bottom half while drawing top half
|
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while (video_counter >= 0x80) ;
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update_grid_rows(GDIM/2,GDIM);
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watchdog0x39 = 0x39;
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}
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}
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