Apple-2-SW/GWRAM.SYSTEM
1
0
Fork 0
mirror of https://github.com/garrettsworkshop/GWRAM.SYSTEM.git synced 2026-04-20 19:16:26 +00:00
Code Issues Projects Releases Wiki Activity

Improve VBL bypass in spin(...)

Browse Source
This commit is contained in:
Zane Kaminski
2021-03-31 07:41:46 -04:00
parent bb0ae40761
commit 214c3f27ea
3 changed files with 6 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
bin/GWRAM.dbg.po
BIN
View File
Binary file not shown.
bin/GWRAM.po
BIN
View File
Binary file not shown.
util.c
+6 -6
View File
@@ -13,9 +13,10 @@ char read_applekey(void) { return ((*PB0) | (*PB1)) & 0x80; }
#define SPIN_FRAMESPERCHAR 4
void spin(uint8_t x, uint8_t y) {
char i;
unsigned int l;
// Sync to frame before starting
while (*VBL >= 0);
for (l = 0; *VBL >= 0 && l < 2500; l++);
// Wait and animate spinner.
// Spin_half
@@ -40,14 +41,13 @@ void spin(uint8_t x, uint8_t y) {
// Wait specificed number of frames
for (k = 0; k < SPIN_FRAMESPERCHAR; k++) {
unsigned char l;
for (l = 0; *VBL < 0 && l < 255; l++);
for (l = 0; *VBL >= 0 && l < 255; l++);
for (l = 0; *VBL < 0 && l < 2500; l++);
for (l = 0; *VBL >= 0 && l < 2500; l++);
}
}
}
// Wait a frame when finished
while (*VBL < 0);
while (*VBL >= 0);
for (l = 0; *VBL < 0 && l < 2500; l++);
for (l = 0; *VBL >= 0 && l < 2500; l++);
}