mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-22 14:33:51 +00:00
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
|
|
#include "dll.h"
|
|
#include <string.h>
|
|
|
|
DLLEntry DLL[NUMSLOTS]; // display list list
|
|
byte DL[NUMSLOTS][SLOTSIZE]; // display list slots
|
|
byte DL_len[NUMSLOTS]; // current bytes in each slot
|
|
#ifdef DLSAVE
|
|
byte DL_save[NUMSLOTS]; // save lengths of each slot
|
|
#endif
|
|
|
|
byte slot0 = 0; // current page offset
|
|
|
|
// set display list list address registers
|
|
void dll_set_addr(const void* dpp) {
|
|
MARIA.DPPH = (word)dpp>>8;
|
|
MARIA.DPPL = (byte)dpp;
|
|
}
|
|
|
|
// clear the current page
|
|
void dll_clear() {
|
|
byte i;
|
|
for (i=slot0; i<slot0+SLOTSPERPAGE; i++) {
|
|
DL_len[i] = 0;
|
|
DL[i][1] = 0;
|
|
}
|
|
}
|
|
|
|
#ifdef DLSAVE
|
|
// save display list lengths of each slot
|
|
void dll_save() {
|
|
memcpy(DL_save, DL_len, sizeof(DL_save));
|
|
}
|
|
|
|
// restore display list lengths of current page
|
|
void dll_restore() {
|
|
byte i;
|
|
for (i=slot0; i<slot0+SLOTSPERPAGE; i++) {
|
|
DL_len[i] = DL_save[i]; // set slot length
|
|
DL[i][DL_len[i]+1] = 0; // set end marker
|
|
}
|
|
}
|
|
|
|
// restore all slots
|
|
void dll_restore_all() {
|
|
slot0 ^= SLOTSPERPAGE;
|
|
dll_restore();
|
|
slot0 ^= SLOTSPERPAGE;
|
|
dll_restore();
|
|
}
|
|
#endif
|
|
|
|
#ifdef DOUBLEBUFFER
|
|
// swap between pages
|
|
void dll_swap() {
|
|
slot0 ^= SLOTSPERPAGE;
|
|
if (!slot0) {
|
|
dll_set_addr(DLL+SLOTSPERPAGE);
|
|
} else {
|
|
dll_set_addr(DLL);
|
|
}
|
|
}
|
|
|
|
// copy offscreen page to current page
|
|
void dll_copy() {
|
|
memcpy(&DL[slot0], &DL[slot0 ^ SLOTSPERPAGE], SLOTSIZE*SLOTSPERPAGE);
|
|
memcpy(&DL_len[slot0], &DL_len[slot0 ^ SLOTSPERPAGE], SLOTSPERPAGE);
|
|
}
|
|
#endif
|
|
|
|
// set scroll position
|
|
void dll_set_scroll(byte y) {
|
|
static byte oldslot = 0;
|
|
byte slot = y / SLOTHEIGHT;
|
|
byte offset = 15 - (y & 15);
|
|
DLL[oldslot].offset_flags = DLL_FLAGS | (SLOTHEIGHT-1);
|
|
DLL[slot].offset_flags = DLL_FLAGS | offset;
|
|
dll_set_addr(DLL + slot);
|
|
oldslot = slot;
|
|
}
|
|
|
|
// allocate a given # of bytes in a slot
|
|
sbyte dll_bytesleft(byte slot) {
|
|
slot &= NUMSLOTS-1;
|
|
return SLOTSIZE - DL_len[slot];
|
|
}
|
|
|
|
// allocate a given # of bytes in a slot
|
|
void* dll_alloc(byte slot, byte len) {
|
|
byte dlofs;
|
|
register byte* dl;
|
|
slot &= NUMSLOTS-1;
|
|
dl = DL[slot];
|
|
dlofs = DL_len[slot];
|
|
DL_len[slot] += len;
|
|
dl[dlofs+len+1] = 0;
|
|
return &dl[dlofs];
|
|
}
|
|
|
|
// add a sprite to currently selected page
|
|
void dll_add_sprite(word addr, byte x, byte y, byte wpal) {
|
|
byte slot = (y / SLOTHEIGHT) | slot0;
|
|
register DL4Entry* dl = (DL4Entry*) dll_alloc(slot, 4);
|
|
dl->data_lo = (byte)addr;
|
|
dl->data_hi = (byte)(addr>>8) + (y & 15);
|
|
dl->xpos = x;
|
|
dl->width_pal = wpal;
|
|
if (y & 15) {
|
|
DL4Entry* dl2 = (DL4Entry*) dll_alloc(slot+1, 4);
|
|
*dl2 = *dl;
|
|
dl2->data_hi -= SLOTHEIGHT;
|
|
}
|
|
}
|
|
|
|
// add a string to currently selected page
|
|
// strings are aligned to top of slot
|
|
void dll_add_string(register const char* str, byte x, byte y, byte wpal) {
|
|
byte slot = (y / SLOTHEIGHT) | slot0;
|
|
register DL5Entry* dl = (DL5Entry*) dll_alloc(slot, 5);
|
|
dl->data_lo = (byte)str;
|
|
dl->data_hi = (word)str>>8;
|
|
dl->flags = DL5_INDIRECT;
|
|
dl->width_pal = wpal;
|
|
dl->xpos = x;
|
|
}
|
|
|
|
// set up display lists
|
|
void dll_setup() {
|
|
byte i;
|
|
byte* dlptr = &DL[0][0];
|
|
register DLLEntry *dll = &DLL[0];
|
|
for (i=0; i<NUMSLOTS; i++) {
|
|
dll->offset_flags = DLL_FLAGS | (SLOTHEIGHT-1);
|
|
dll->dl_hi = (word)dlptr>>8;
|
|
dll->dl_lo = (byte)dlptr;
|
|
dlptr += sizeof(DL[0]);
|
|
dll++;
|
|
}
|
|
dll_clear();
|
|
#ifdef DOUBLEBUFFER
|
|
dll_swap();
|
|
dll_clear();
|
|
dll_swap();
|
|
#else
|
|
dll_set_addr(DLL);
|
|
#endif
|
|
#ifdef DLSAVE
|
|
memset(DL_save, 0, sizeof(DL_save));
|
|
#endif
|
|
}
|