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Implement vipUntil()

This commit is contained in:
Guy Perfect 2024-10-16 18:19:31 -05:00
parent eecc55bbd7
commit 7a8cf8952a
2 changed files with 13 additions and 3 deletions
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1
core/vb.c
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@ -121,6 +121,7 @@ struct VB {
uint32_t fbSrc; /* Source frame buffer address */
int32_t repeat; /* Current column table repeat value */
int step; /* Processing phase */
uint32_t until; /* Clocks until interrupt condition */
} dp;
/* Pixel processor */

15
core/vip.c
View File

@ -382,16 +382,18 @@ static int vipOnFrame(VB *sim) {
static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
/* Process all clocks */
while (clocks != 0) {
for (;;) {
/* The next event is after the time remaining */
if (sim->vip.dp.clocks > clocks) {
sim->vip.dp.clocks -= clocks;
sim->vip.dp.until -= clocks;
return 0;
}
/* Advance forward the component's number of clocks */
clocks -= sim->vip.dp.clocks;
sim->vip.dp.until -= sim->vip.dp.clocks;
sim->vip.dp.clocks = 0;
/* Processing by operation phase */
@ -401,6 +403,7 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
sim->vip.dp.clocks = vipClocksMs(3);
sim->vip.dp.fclk = 1;
sim->vip.dp.step = 1;
sim->vip.dp.until = vipClocksMs(8);
vipThrow(sim, 0x0010); /* FRAMESTART */
/* TODO: Initiate drawing, throw GAMESTART */
/* ELSE: Set OVERTIME, throw TIMEERR */
@ -437,6 +440,7 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
else sim->vip.dp.l1bsy = 0;
sim->vip.dp.clocks = vipClocksMs(2);
sim->vip.dp.step = 4;
sim->vip.dp.until = vipClocksMs(10);
vipThrow(sim, 0x0002); /* LFBEND */
break;
@ -460,10 +464,14 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
/* Fallthrough */
case 6: /* 13ms-18ms - Display right frame buffer */
if ((sim->vip.dp.column & 3) == 0)
vipComputeBrightness(sim);
vipTransferColumn(sim, 1);
sim->vip.dp.clocks =
260 + (0xA94 >> sim->vip.dp.column % 12 & 1);
sim->vip.dp.column++;
if ((sim->vip.dp.column & 3) == 0)
sim->vip.dp.cta -= 2;
if (sim->vip.dp.column == 384)
sim->vip.dp.step = 7;
break;
@ -474,6 +482,7 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
else sim->vip.dp.r1bsy = 0;
sim->vip.dp.clocks = vipClocksMs(2);
sim->vip.dp.step = 0;
sim->vip.dp.until = vipClocksMs(2);
vipThrow(sim, 0x0004); /* RFBEND */
if (vipOnFrame(sim))
return 1;
@ -587,8 +596,8 @@ static void vipReset(VB *sim) {
/* Determine how many clocks are guaranteed to process */
static uint32_t vipUntil(VB *sim, uint32_t clocks) {
(void) sim;
/* Don't allow clocks to exceed interrupt conditions, even if disabled */
if (clocks > sim->vip.dp.until)
clocks = sim->vip.dp.until;
return clocks;
}