git.mutantstargoat.com Git - lugburz/blob - src/amiga/copper.c

   1 #include "copper.h"
   2 #include "hwregs.h"
   3
   4 uint32_t *copperlist, *copperlist_end;
   5 static uint32_t *copmem, *curlist;
   6 static int mode, copmem_size;
   7
   8 extern uint32_t **_mem_start;
   9
  10 int init_copper(uint32_t *cmem, int maxlist, int nlists)
  11 {
  12         /* allocate and set new copper lists */
  13         if(maxlist <= 0) maxlist = 256;
  14         mode = nlists >= COPPER_DOUBLE ? COPPER_DOUBLE : COPPER_SINGLE;
  15
  16         copmem_size = maxlist * 4 * mode;
  17         copmem = cmem ? cmem : *_mem_start;
  18
  19         curlist = copperlist = copmem;
  20         *curlist = COPPER_END;
  21
  22         if(mode == COPPER_DOUBLE) {
  23                 copperlist = curlist + maxlist;
  24                 *copperlist = COPPER_END;
  25         }
  26         copperlist_end = copperlist;
  27
  28         REG32_COP1LC = (uint32_t)curlist;
  29         REG_COPJMP1 = 0;        /* causes copper to read COP1LC */
  30         return 0;
  31 }
  32
  33 void cleanup_copper(void)
  34 {
  35 }
  36
  37 void enable_copper(void)
  38 {
  39         REG_DMACON = SETBITS(DMA_COPPER);
  40 }
  41
  42 void disable_copper(void)
  43 {
  44         REG_DMACON = CLRBITS(DMA_COPPER);
  45 }
  46
  47 void clear_copper(void)
  48 {
  49         copperlist_end = copperlist;
  50         *copperlist_end = COPPER_END;
  51 }
  52
  53 void add_copper(uint32_t cmd)
  54 {
  55         *copperlist_end++ = cmd;
  56 }
  57
  58 void sort_copper(void)
  59 {
  60         /* TODO */
  61 }
  62
  63 void swap_copper(void)
  64 {
  65         if(mode == COPPER_DOUBLE) {
  66                 uint32_t *tmpptr;
  67                 tmpptr = curlist;
  68                 curlist = copperlist;
  69                 copperlist = copperlist_end = tmpptr;
  70
  71                 REG32_COP1LC = (uint32_t)curlist;
  72                 REG_COPJMP1 = 0;
  73         } else {
  74                 copperlist_end = curlist;
  75         }
  76         *copperlist_end = COPPER_END;
  77 }