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xrick2gs
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scroller: optimize scroller, pass one, remove multiplies from array indexes, remove redundant draws, and reduce the size of the blit rect to the actual size of the playfield

This commit is contained in:
dwsJason 2018-09-23 21:11:56 -04:00
parent 59a8a34912
commit 09b04a798e
1 changed files with 45 additions and 26 deletions
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71
src/scroller.c
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@ -29,6 +29,8 @@ static U8 period;
segment "screen";
#endif
rect_t scroll_SCREENRECT = { 32, 8, 256, SYSVID_HEIGHT-8, NULL };
/*
* Scroll up
*
@ -37,6 +39,9 @@ U8
scroll_up(void)
{
U8 i, j;
ent_t *pEnt;
U8* pSrc;
U8* pDst;
static U8 n = 0;
/* last call: restore */
@ -53,21 +58,27 @@ scroll_up(void)
}
/* translate map */
pDst = &map_map[MAP_ROW_SCRTOP][0];
pSrc = pDst+32;
for (i = MAP_ROW_SCRTOP; i < MAP_ROW_HBBOT; i++)
for (j = 0x00; j < 0x20; j++)
map_map[i][j] = map_map[i + 1][j];
{
memcpy(pDst, pSrc, (size_t)32);
pDst = pSrc;
pSrc += 32;
}
/* translate entities */
for (i = 0; ent_ents[i].n != 0xFF; i++) {
if (ent_ents[i].n) {
ent_ents[i].ysave -= 8;
ent_ents[i].trig_y -= 8;
ent_ents[i].y -= 8;
if (ent_ents[i].y & 0x8000) { /* map coord. from 0x0000 to 0x0140 */
for (pEnt = ent_ents; pEnt->n != 0xFF; ++pEnt) {
if (pEnt->n) {
pEnt->ysave -= 8;
pEnt->trig_y -= 8;
pEnt->y -= 8;
if (pEnt->y & 0x8000) { /* map coord. from 0x0000 to 0x0140 */
IFDEBUG_SCROLLER(
sys_printf("xrick/scroller: entity %#04X is gone\n", i);
);
ent_ents[i].n = 0;
pEnt->n = 0;
}
}
}
@ -75,7 +86,7 @@ scroll_up(void)
/* display */
draw_map();
ent_draw();
draw_drawStatus();
// draw_drawStatus();
map_frow++;
/* loop */
@ -87,12 +98,12 @@ scroll_up(void)
map_expand();
/* display */
draw_map();
//draw_map();
ent_draw();
draw_drawStatus();
// draw_drawStatus();
}
game_rects = &draw_SCREENRECT;
game_rects = &scroll_SCREENRECT;
return SCROLL_RUNNING;
}
@ -105,6 +116,9 @@ U8
scroll_down(void)
{
U8 i, j;
ent_t *pEnt;
U8* pSrc;
U8* pDst;
static U8 n = 0;
/* last call: restore */
@ -121,21 +135,26 @@ scroll_down(void)
}
/* translate map */
pDst = &map_map[MAP_ROW_SCRBOT][0];
pSrc = pDst+32;
for (i = MAP_ROW_SCRBOT; i > MAP_ROW_HTTOP; i--)
for (j = 0x00; j < 0x20; j++)
map_map[i][j] = map_map[i - 1][j];
{
memcpy(pDst, pSrc, (size_t)32);
pDst = pSrc;
pSrc -= 32;
}
/* translate entities */
for (i = 0; ent_ents[i].n != 0xFF; i++) {
if (ent_ents[i].n) {
ent_ents[i].ysave += 8;
ent_ents[i].trig_y += 8;
ent_ents[i].y += 8;
if (ent_ents[i].y > 0x0140) { /* map coord. from 0x0000 to 0x0140 */
for (pEnt = ent_ents; pEnt->n != 0xFF; ++pEnt) {
if (pEnt->n) {
pEnt->ysave += 8;
pEnt->trig_y += 8;
pEnt->y += 8;
if (pEnt->y > 0x0140) { /* map coord. from 0x0000 to 0x0140 */
IFDEBUG_SCROLLER(
sys_printf("xrick/scroller: entity %#04X is gone\n", i);
);
ent_ents[i].n = 0;
pEnt->n = 0;
}
}
}
@ -143,7 +162,7 @@ scroll_down(void)
/* display */
draw_map();
ent_draw();
draw_drawStatus();
// draw_drawStatus();
map_frow--;
/* loop */
@ -155,12 +174,12 @@ scroll_down(void)
map_expand();
/* display */
draw_map();
//draw_map();
ent_draw();
draw_drawStatus();
// draw_drawStatus();
}
game_rects = &draw_SCREENRECT;
game_rects = &scroll_SCREENRECT;
return SCROLL_RUNNING;
}