mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-25 15:30:03 +00:00
161 lines
3.9 KiB
Plaintext
161 lines
3.9 KiB
Plaintext
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#include <string.h>
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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typedef enum { false, true } bool;
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byte __at (0x0) vidmem[152][256]; // 304x256x4bpp video memory
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byte __at (0xc000) palette[16];
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volatile byte __at (0xc804) input0;
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volatile byte __at (0xc806) input1;
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volatile byte __at (0xc80c) input2;
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byte __at (0xc80c) sound_pia;
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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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__sfr __at (0) debug;
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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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// switch flags
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#define UP1 (input0 & 0x1)
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#define DOWN1 (input0 & 0x2)
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#define LEFT1 (input0 & 0x4)
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#define RIGHT1 (input0 & 0x8)
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#define START1 (input0 & 0x10)
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#define START2 (input0 & 0x20)
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#define UP2 (input0 & 0x40)
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#define DOWN2 (input0 & 0x80)
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#define LEFT2 (input1 & 0x1)
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#define RIGHT2 (input1 & 0x2)
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#define AUTOUP (input2 & 0x1)
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#define ADVANCE (input2 & 0x2)
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#define COIN2 (input2 & 0x4)
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#define HIGHSCORERESET (input2 & 0x8)
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#define COIN1 (input2 & 0x10)
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#define COIN3 (input2 & 0x20)
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#define TILTSWITCH (input2 & 0x40)
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#define SOUNDACK (input2 & 0x80)
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#define WATCHDOG watchdog0x39=0x39;
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//
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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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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 draw_solid(word 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>>1)+y1*256; // swapped
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blitter.solid = color;
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blitter.flags = (x1&1) ? DSTSCREEN|SOLID|RSHIFT : DSTSCREEN|SOLID;
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}
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inline void draw_vline(word x1, byte y1, byte h, byte color) {
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blitter.width = 1^4;
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blitter.height = h^4;
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blitter.dstart = (x1>>1)+y1*256; // swapped
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blitter.solid = color;
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blitter.flags = (x1&1) ? DSTSCREEN|SOLID|ODDONLY : DSTSCREEN|SOLID|EVENONLY;
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}
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inline void blit_copy_solid(word x, byte y, 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.solid = solid;
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blitter.sstart = swapw((word)data);
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blitter.dstart = (x>>1)+y*256; // swapped
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if (solid)
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blitter.flags = (x&1) ? DSTSCREEN|FGONLY|SOLID|RSHIFT : DSTSCREEN|FGONLY|SOLID;
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else
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blitter.flags = (x&1) ? DSTSCREEN|RSHIFT : DSTSCREEN;
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}
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// bias sprites by +4 pixels
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#define XBIAS 2
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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>>1)+y*256+XBIAS; // swapped
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blitter.flags = (x&1) ? DSTSCREEN|FGONLY|RSHIFT : 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>>1)+y*256+XBIAS; // swapped
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blitter.solid = color;
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blitter.flags = (x&1) ? DSTSCREEN|FGONLY|RSHIFT|SOLID : DSTSCREEN|FGONLY|SOLID;
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}
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void draw_box(word x1, byte y1, word x2, byte y2, byte color) {
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draw_solid(x1, y1, (x2-x1)>>1, 1, color);
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draw_solid(x1, y2, (x2-x1)>>1, 1, color);
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draw_vline(x1, y1, y2-y1, color);
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draw_vline(x2, y1, y2-y1, color);
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}
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static byte frame = 0;
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void main() {
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palette[0] = 0x11;
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palette[1] = 0xff+frame++;
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blit_solid(0,0,25,25,0x11);
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main();
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}
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