Copper last cycle special case fix.

diff --git a/custom.cpp b/custom.cpp
index e21df30bc94bce7c47409be8630862073d3d683b..8b72c8c1d466aa2fab8448bd1b3ecb805223fd78 100644 (file)
--- a/custom.cpp
+++ b/custom.cpp
@@ -9272,6 +9272,16 @@ static bool copper_cant_read(int hpos, uae_u16 alloc)
 
        int coffset = RGA_PIPELINE_OFFSET_COPPER;
        if (hpos == maxhposm1 && maxhposeven == COPPER_CYCLE_POLARITY) {
+               // if copper used last cycle of scanline and it is even cycle and
+               // it wants next available copper cycle:
+               // next scanline's cycles 1 and 2 gets allocated.
+               // cycle 1 is not used and also not usable by CPU or blitter.
+               // cycle 2 is used by the copper.
+               int offset = get_rga_pipeline(hpos, coffset);
+               if (alloc && !bitplane_dma_access(hpos, coffset) && !cycle_line_pipe[offset]) {
+                       cycle_line_pipe[offset] = CYCLE_PIPE_NONE | CYCLE_PIPE_COPPER;
+                       blitter_pipe[offset] = CYCLE_PIPE_COPPER;
+               }
                coffset++;
        }