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MGA: 3D busmastering now works (albeit slowly)

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Cacodemon345
2023-12-20 16:19:29 +06:00
parent bf30678d5f
commit 7a8fe414c5
1 changed files with 27 additions and 23 deletions
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50
src/video/vid_mga.c
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@@ -2672,6 +2672,11 @@ run_dma(mystique_t *mystique)
thread_wait_mutex(mystique->dma.lock);
if (mystique->dma.state == DMA_STATE_IDLE) {
if (!(mystique->status & STATUS_ENDPRDMASTS))
{
/* Force this to appear. */
mystique->endprdmasts_pending = 1;
}
thread_release_mutex(mystique->dma.lock);
return;
}
@@ -2872,13 +2877,13 @@ fifo_thread(void *priv)
mystique_t *mystique = (mystique_t *) priv;
while (mystique->thread_run) {
int words_transferred = 0;
thread_set_event(mystique->fifo_not_full_event);
thread_wait_event(mystique->wake_fifo_thread, -1);
thread_reset_event(mystique->wake_fifo_thread);
while (!FIFO_EMPTY || mystique->dma.state != DMA_STATE_IDLE) {
int words_transferred = 0;
words_transferred = 0;
while (!FIFO_EMPTY && words_transferred < 100) {
fifo_entry_t *fifo = &mystique->fifo[mystique->fifo_read_idx & FIFO_MASK];
@@ -2905,13 +2910,13 @@ fifo_thread(void *priv)
words_transferred++;
}
/*Only run DMA once the FIFO is empty. Required by
Screamer 2 / Rally which will incorrectly clip an ILOAD
if DMA runs ahead*/
if (!words_transferred)
run_dma(mystique);
}
/*Only run DMA once the FIFO is empty. Required by
Screamer 2 / Rally which will incorrectly clip an ILOAD
if DMA runs ahead*/
if (!words_transferred)
run_dma(mystique);
}
}
@@ -2962,22 +2967,21 @@ mystique_softrap_pending_timer(void *priv)
timer_advance_u64(&mystique->softrap_pending_timer, TIMER_USEC * 100);
if (thread_test_mutex(mystique->dma.lock))
{
if (mystique->endprdmasts_pending) {
mystique->endprdmasts_pending = 0;
mystique->status |= STATUS_ENDPRDMASTS;
}
if (mystique->softrap_pending) {
mystique->softrap_pending--;
mystique->dma.secaddress = mystique->softrap_pending_val;
mystique->status |= STATUS_SOFTRAPEN;
//pclog("softrapen\n");
mystique_update_irqs(mystique);
}
thread_release_mutex(mystique->dma.lock);
if (mystique->endprdmasts_pending) {
mystique->endprdmasts_pending = 0;
mystique->status |= STATUS_ENDPRDMASTS;
}
if (mystique->softrap_pending) {
mystique->softrap_pending--;
mystique->dma.secaddress = mystique->softrap_pending_val;
mystique->status |= STATUS_SOFTRAPEN;
//pclog("softrapen\n");
mystique_update_irqs(mystique);
}
/* Force ENDPRDMASTS flag to be set. */
if (mystique->dma.state == DMA_STATE_IDLE && !(mystique->status & STATUS_ENDPRDMASTS))
wake_fifo_thread(mystique);
}
static void