testing stuff

[retrocrawl] / src / amiga / copper.c

diff --git a/src/amiga/copper.c b/src/amiga/copper.c
new file mode 100644 (file)
index 0000000..2c22d8a
--- /dev/null
+++ b/src/amiga/copper.c
@@ -0,0 +1,77 @@
+#include "copper.h"
+#include "hwregs.h"
+
+uint32_t *copperlist, *copperlist_end;
+static uint32_t *copmem, *curlist;
+static int mode, copmem_size;
+
+extern uint32_t **_mem_start;
+
+int init_copper(int maxlist, int nlists)
+{
+       /* allocate and set new copper lists */
+       if(maxlist <= 0) maxlist = 256;
+       mode = nlists >= COPPER_DOUBLE ? COPPER_DOUBLE : COPPER_SINGLE;
+
+       copmem_size = maxlist * 4 * mode;
+       copmem = *_mem_start;
+
+       curlist = copperlist = copmem;
+       *curlist = COPPER_END;
+
+       if(mode == COPPER_DOUBLE) {
+               copperlist = curlist + maxlist;
+               *copperlist = COPPER_END;
+       }
+       copperlist_end = copperlist;
+
+       REG32_COP1LC = (uint32_t)curlist;
+       REG_COPJMP1 = 0;        /* causes copper to read COP1LC */
+       return 0;
+}
+
+void cleanup_copper(void)
+{
+}
+
+void enable_copper(void)
+{
+       REG_DMACON = SETBITS(DMA_COPPER);
+}
+
+void disable_copper(void)
+{
+       REG_DMACON = CLRBITS(DMA_COPPER);
+}
+
+void clear_copper(void)
+{
+       copperlist_end = copperlist;
+       *copperlist_end = COPPER_END;
+}
+
+void add_copper(uint32_t cmd)
+{
+       *copperlist_end++ = cmd;
+}
+
+void sort_copper(void)
+{
+       /* TODO */
+}
+
+void swap_copper(void)
+{
+       if(mode == COPPER_DOUBLE) {
+               uint32_t *tmpptr;
+               tmpptr = curlist;
+               curlist = copperlist;
+               copperlist = copperlist_end = tmpptr;
+
+               REG32_COP1LC = (uint32_t)curlist;
+               REG_COPJMP1 = 0;
+       } else {
+               copperlist_end = curlist;
+       }
+       *copperlist_end = COPPER_END;
+}