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Refinement of the checks, so no IRQ is raised when not in autodma mode.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4307
This commit is contained in:
Peter Veenstra 2020-01-12 17:51:04 +00:00
parent dbd6be2da0
commit 51aecb14c6
1 changed files with 3 additions and 1 deletions
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4
src/hardware/sblaster.cpp
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@ -294,7 +294,9 @@ static void DSP_DMA_CallBack(DmaChannel * chan, DMAEvent event) {
if (!min_size) min_size = 1;
min_size *= 2;
if (sb.dma.left > min_size) {
if (s > (sb.dma.left-min_size)) s = sb.dma.left - min_size;
if (s > (sb.dma.left - min_size)) s = sb.dma.left - min_size;
//This will trigger a irq, see GenerateDMASound, so lets not do that
if (!sb.dma.autoinit && sb.dma.left <= sb.dma.min) s = 0;
if (s) GenerateDMASound(s);
}
sb.mode = MODE_DMA_MASKED;