[pcsx_rearmed.git] / plugins / gpulib / gpu.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2011-2012
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <string.h>
#include "gpu.h"

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#ifdef __GNUC__
#define unlikely(x) __builtin_expect((x), 0)
#define preload __builtin_prefetch
#define noinline __attribute__((noinline))
#else
#define unlikely(x)
#define preload(...)
#define noinline
#endif

#define gpu_log(fmt, ...) \
  printf("%d:%03d: " fmt, *gpu.state.frame_count, *gpu.state.hcnt, ##__VA_ARGS__)

//#define log_io gpu_log
#define log_io(...)
//#define log_anomaly gpu_log
#define log_anomaly(...)

struct psx_gpu gpu;

static noinline int do_cmd_buffer(uint32_t *data, int count);
static void finish_vram_transfer(int is_read);

static noinline void do_cmd_reset(void)
{
  if (unlikely(gpu.cmd_len > 0))
    do_cmd_buffer(gpu.cmd_buffer, gpu.cmd_len);
  gpu.cmd_len = 0;

  if (unlikely(gpu.dma.h > 0))
    finish_vram_transfer(gpu.dma_start.is_read);
  gpu.dma.h = 0;
}

static noinline void do_reset(void)
{
  unsigned int i;

  do_cmd_reset();

  memset(gpu.regs, 0, sizeof(gpu.regs));
  for (i = 0; i < sizeof(gpu.ex_regs) / sizeof(gpu.ex_regs[0]); i++)
    gpu.ex_regs[i] = (0xe0 + i) << 24;
  gpu.status = 0x14802000;
  gpu.gp0 = 0;
  gpu.regs[3] = 1;
  gpu.screen.hres = gpu.screen.w = 256;
  gpu.screen.vres = gpu.screen.h = 240;
}

static noinline void update_width(void)
{
  int sw = gpu.screen.x2 - gpu.screen.x1;
  if (sw <= 0 || sw >= 2560)
    // full width
    gpu.screen.w = gpu.screen.hres;
  else
    gpu.screen.w = sw * gpu.screen.hres / 2560;
}

static noinline void update_height(void)
{
  // TODO: emulate this properly..
  int sh = gpu.screen.y2 - gpu.screen.y1;
  if (gpu.status & PSX_GPU_STATUS_DHEIGHT)
    sh *= 2;
  if (sh <= 0 || sh > gpu.screen.vres)
    sh = gpu.screen.vres;

  gpu.screen.h = sh;
}

static noinline void decide_frameskip(void)
{
  if (gpu.frameskip.active)
    gpu.frameskip.cnt++;
  else {
    gpu.frameskip.cnt = 0;
    gpu.frameskip.frame_ready = 1;
  }

  if (!gpu.frameskip.active && *gpu.frameskip.advice)
    gpu.frameskip.active = 1;
  else if (gpu.frameskip.set > 0 && gpu.frameskip.cnt < gpu.frameskip.set)
    gpu.frameskip.active = 1;
  else
    gpu.frameskip.active = 0;

  if (!gpu.frameskip.active && gpu.frameskip.pending_fill[0] != 0) {
    int dummy;
    do_cmd_list(gpu.frameskip.pending_fill, 3, &dummy);
    gpu.frameskip.pending_fill[0] = 0;
  }
}

static noinline int decide_frameskip_allow(uint32_t cmd_e3)
{
  // no frameskip if it decides to draw to display area,
  // but not for interlace since it'll most likely always do that
  uint32_t x = cmd_e3 & 0x3ff;
  uint32_t y = (cmd_e3 >> 10) & 0x3ff;
  gpu.frameskip.allow = (gpu.status & PSX_GPU_STATUS_INTERLACE) ||
    (uint32_t)(x - gpu.screen.x) >= (uint32_t)gpu.screen.w ||
    (uint32_t)(y - gpu.screen.y) >= (uint32_t)gpu.screen.h;
  return gpu.frameskip.allow;
}

static noinline void get_gpu_info(uint32_t data)
{
  switch (data & 0x0f) {
    case 0x02:
    case 0x03:
    case 0x04:
    case 0x05:
      gpu.gp0 = gpu.ex_regs[data & 7] & 0xfffff;
      break;
    case 0x06:
      gpu.gp0 = gpu.ex_regs[5] & 0xfffff;
      break;
    case 0x07:
      gpu.gp0 = 2;
      break;
    default:
      gpu.gp0 = 0;
      break;
  }
}

// double, for overdraw guard
#define VRAM_SIZE (1024 * 512 * 2 * 2)

static int map_vram(void)
{
  gpu.vram = gpu.mmap(VRAM_SIZE);
  if (gpu.vram != NULL) {
    gpu.vram += 4096 / 2;
    return 0;
  }
  else {
    fprintf(stderr, "could not map vram, expect crashes\n");
    return -1;
  }
}

long GPUinit(void)
{
  int ret;
  ret  = vout_init();
  ret |= renderer_init();

  gpu.state.frame_count = &gpu.zero;
  gpu.state.hcnt = &gpu.zero;
  gpu.frameskip.active = 0;
  gpu.cmd_len = 0;
  do_reset();

  if (gpu.mmap != NULL) {
    if (map_vram() != 0)
      ret = -1;
  }
  return ret;
}

long GPUshutdown(void)
{
  long ret;

  renderer_finish();
  ret = vout_finish();
  if (gpu.vram != NULL) {
    gpu.vram -= 4096 / 2;
    gpu.munmap(gpu.vram, VRAM_SIZE);
  }
  gpu.vram = NULL;

  return ret;
}

void GPUwriteStatus(uint32_t data)
{
  static const short hres[8] = { 256, 368, 320, 384, 512, 512, 640, 640 };
  static const short vres[4] = { 240, 480, 256, 480 };
  uint32_t cmd = data >> 24;

  if (cmd < ARRAY_SIZE(gpu.regs)) {
    if (cmd > 1 && cmd != 5 && gpu.regs[cmd] == data)
      return;
    gpu.regs[cmd] = data;
  }

  gpu.state.fb_dirty = 1;

  switch (cmd) {
    case 0x00:
      do_reset();
      break;
    case 0x01:
      do_cmd_reset();
      break;
    case 0x03:
      if (data & 1)
        gpu.status |= PSX_GPU_STATUS_BLANKING;
      else
        gpu.status &= ~PSX_GPU_STATUS_BLANKING;
      break;
    case 0x04:
      gpu.status &= ~PSX_GPU_STATUS_DMA_MASK;
      gpu.status |= PSX_GPU_STATUS_DMA(data & 3);
      break;
    case 0x05:
      gpu.screen.x = data & 0x3ff;
      gpu.screen.y = (data >> 10) & 0x1ff;
      if (gpu.frameskip.set) {
        decide_frameskip_allow(gpu.ex_regs[3]);
        if (gpu.frameskip.last_flip_frame != *gpu.state.frame_count) {
          decide_frameskip();
          gpu.frameskip.last_flip_frame = *gpu.state.frame_count;
        }
      }
      break;
    case 0x06:
      gpu.screen.x1 = data & 0xfff;
      gpu.screen.x2 = (data >> 12) & 0xfff;
      update_width();
      break;
    case 0x07:
      gpu.screen.y1 = data & 0x3ff;
      gpu.screen.y2 = (data >> 10) & 0x3ff;
      update_height();
      break;
    case 0x08:
      gpu.status = (gpu.status & ~0x7f0000) | ((data & 0x3F) << 17) | ((data & 0x40) << 10);
      gpu.screen.hres = hres[(gpu.status >> 16) & 7];
      gpu.screen.vres = vres[(gpu.status >> 19) & 3];
      update_width();
      update_height();
      renderer_notify_res_change();
      break;
    default:
      if ((cmd & 0xf0) == 0x10)
        get_gpu_info(data);
      break;
  }

#ifdef GPUwriteStatus_ext
  GPUwriteStatus_ext(data);
#endif
}

const unsigned char cmd_lengths[256] =
{
	0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	3, 3, 3, 3, 6, 6, 6, 6, 4, 4, 4, 4, 8, 8, 8, 8, // 20
	5, 5, 5, 5, 8, 8, 8, 8, 7, 7, 7, 7, 11, 11, 11, 11,
	2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, // 40
	3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
	2, 2, 2, 2, 3, 3, 3, 3, 1, 1, 1, 1, 0, 0, 0, 0, // 60
	1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2,
	3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // a0
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // c0
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // e0
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

#define VRAM_MEM_XY(x, y) &gpu.vram[(y) * 1024 + (x)]

static inline void do_vram_line(int x, int y, uint16_t *mem, int l, int is_read)
{
  uint16_t *vram = VRAM_MEM_XY(x, y);
  if (is_read)
    memcpy(mem, vram, l * 2);
  else
    memcpy(vram, mem, l * 2);
}

static int do_vram_io(uint32_t *data, int count, int is_read)
{
  int count_initial = count;
  uint16_t *sdata = (uint16_t *)data;
  int x = gpu.dma.x, y = gpu.dma.y;
  int w = gpu.dma.w, h = gpu.dma.h;
  int o = gpu.dma.offset;
  int l;
  count *= 2; // operate in 16bpp pixels

  if (gpu.dma.offset) {
    l = w - gpu.dma.offset;
    if (count < l)
      l = count;

    do_vram_line(x + o, y, sdata, l, is_read);

    if (o + l < w)
      o += l;
    else {
      o = 0;
      y++;
      h--;
    }
    sdata += l;
    count -= l;
  }

  for (; h > 0 && count >= w; sdata += w, count -= w, y++, h--) {
    y &= 511;
    do_vram_line(x, y, sdata, w, is_read);
  }

  if (h > 0) {
    if (count > 0) {
      y &= 511;
      do_vram_line(x, y, sdata, count, is_read);
      o = count;
      count = 0;
    }
  }
  else
    finish_vram_transfer(is_read);
  gpu.dma.y = y;
  gpu.dma.h = h;
  gpu.dma.offset = o;

  return count_initial - count / 2;
}

static void start_vram_transfer(uint32_t pos_word, uint32_t size_word, int is_read)
{
  if (gpu.dma.h)
    log_anomaly("start_vram_transfer while old unfinished\n");

  gpu.dma.x = pos_word & 0x3ff;
  gpu.dma.y = (pos_word >> 16) & 0x1ff;
  gpu.dma.w = ((size_word - 1) & 0x3ff) + 1;
  gpu.dma.h = (((size_word >> 16) - 1) & 0x1ff) + 1;
  gpu.dma.offset = 0;
  gpu.dma.is_read = is_read;
  gpu.dma_start = gpu.dma;

  renderer_flush_queues();
  if (is_read) {
    gpu.status |= PSX_GPU_STATUS_IMG;
    // XXX: wrong for width 1
    memcpy(&gpu.gp0, VRAM_MEM_XY(gpu.dma.x, gpu.dma.y), 4);
    gpu.state.last_vram_read_frame = *gpu.state.frame_count;
  }

  log_io("start_vram_transfer %c (%d, %d) %dx%d\n", is_read ? 'r' : 'w',
    gpu.dma.x, gpu.dma.y, gpu.dma.w, gpu.dma.h);
}

static void finish_vram_transfer(int is_read)
{
  if (is_read)
    gpu.status &= ~PSX_GPU_STATUS_IMG;
  else
    renderer_update_caches(gpu.dma_start.x, gpu.dma_start.y,
                           gpu.dma_start.w, gpu.dma_start.h);
}

static noinline int do_cmd_list_skip(uint32_t *data, int count, int *last_cmd)
{
  int cmd = 0, pos = 0, len, dummy, v;
  int skip = 1;

  gpu.frameskip.pending_fill[0] = 0;

  while (pos < count && skip) {
    uint32_t *list = data + pos;
    cmd = LE32TOH(list[0]) >> 24;
    len = 1 + cmd_lengths[cmd];

    switch (cmd) {
      case 0x02:
        if ((LE32TOH(list[2]) & 0x3ff) > gpu.screen.w || ((LE32TOH(list[2]) >> 16) & 0x1ff) > gpu.screen.h)
          // clearing something large, don't skip
          do_cmd_list(list, 3, &dummy);
        else
          memcpy(gpu.frameskip.pending_fill, list, 3 * 4);
        break;
      case 0x24 ... 0x27:
      case 0x2c ... 0x2f:
      case 0x34 ... 0x37:
      case 0x3c ... 0x3f:
        gpu.ex_regs[1] &= ~0x1ff;
        gpu.ex_regs[1] |= LE32TOH(list[4 + ((cmd >> 4) & 1)]) & 0x1ff;
        break;
      case 0x48 ... 0x4F:
        for (v = 3; pos + v < count; v++)
        {
          if ((list[v] & HTOLE32(0xf000f000)) == HTOLE32(0x50005000))
            break;
        }
        len += v - 3;
        break;
      case 0x58 ... 0x5F:
        for (v = 4; pos + v < count; v += 2)
        {
          if ((list[v] & HTOLE32(0xf000f000)) == HTOLE32(0x50005000))
            break;
        }
        len += v - 4;
        break;
      default:
        if (cmd == 0xe3)
          skip = decide_frameskip_allow(LE32TOH(list[0]));
        if ((cmd & 0xf8) == 0xe0)
          gpu.ex_regs[cmd & 7] = LE32TOH(list[0]);
        break;
    }

    if (pos + len > count) {
      cmd = -1;
      break; // incomplete cmd
    }
    if (0xa0 <= cmd && cmd <= 0xdf)
      break; // image i/o

    pos += len;
  }

  renderer_sync_ecmds(gpu.ex_regs);
  *last_cmd = cmd;
  return pos;
}

static noinline int do_cmd_buffer(uint32_t *data, int count)
{
  int cmd, pos;
  uint32_t old_e3 = gpu.ex_regs[3];
  int vram_dirty = 0;

  // process buffer
  for (pos = 0; pos < count; )
  {
    if (gpu.dma.h && !gpu.dma_start.is_read) { // XXX: need to verify
      vram_dirty = 1;
      pos += do_vram_io(data + pos, count - pos, 0);
      if (pos == count)
        break;
    }

    cmd = LE32TOH(data[pos]) >> 24;
    if (0xa0 <= cmd && cmd <= 0xdf) {
      if (unlikely((pos+2) >= count)) {
        // incomplete vram write/read cmd, can't consume yet
        cmd = -1;
        break;
      }

      // consume vram write/read cmd
      start_vram_transfer(LE32TOH(data[pos + 1]), LE32TOH(data[pos + 2]), (cmd & 0xe0) == 0xc0);
      pos += 3;
      continue;
    }

    // 0xex cmds might affect frameskip.allow, so pass to do_cmd_list_skip
    if (gpu.frameskip.active && (gpu.frameskip.allow || ((LE32TOH(data[pos]) >> 24) & 0xf0) == 0xe0))
      pos += do_cmd_list_skip(data + pos, count - pos, &cmd);
    else {
      pos += do_cmd_list(data + pos, count - pos, &cmd);
      vram_dirty = 1;
    }

    if (cmd == -1)
      // incomplete cmd
      break;
  }

  gpu.status &= ~0x1fff;
  gpu.status |= gpu.ex_regs[1] & 0x7ff;
  gpu.status |= (gpu.ex_regs[6] & 3) << 11;

  gpu.state.fb_dirty |= vram_dirty;

  if (old_e3 != gpu.ex_regs[3])
    decide_frameskip_allow(gpu.ex_regs[3]);

  return count - pos;
}

static void flush_cmd_buffer(void)
{
  int left = do_cmd_buffer(gpu.cmd_buffer, gpu.cmd_len);
  if (left > 0)
    memmove(gpu.cmd_buffer, gpu.cmd_buffer + gpu.cmd_len - left, left * 4);
  gpu.cmd_len = left;
}

void GPUwriteDataMem(uint32_t *mem, int count)
{
  int left;

  log_io("gpu_dma_write %p %d\n", mem, count);

  if (unlikely(gpu.cmd_len > 0))
    flush_cmd_buffer();

  left = do_cmd_buffer(mem, count);
  if (left)
    log_anomaly("GPUwriteDataMem: discarded %d/%d words\n", left, count);
}

void GPUwriteData(uint32_t data)
{
  log_io("gpu_write %08x\n", data);
  gpu.cmd_buffer[gpu.cmd_len++] = HTOLE32(data);
  if (gpu.cmd_len >= CMD_BUFFER_LEN)
    flush_cmd_buffer();
}

long GPUdmaChain(uint32_t *rambase, uint32_t start_addr)
{
  uint32_t addr, *list, ld_addr = 0;
  int len, left, count;
  long cpu_cycles = 0;

  preload(rambase + (start_addr & 0x1fffff) / 4);

  if (unlikely(gpu.cmd_len > 0))
    flush_cmd_buffer();

  log_io("gpu_dma_chain\n");
  addr = start_addr & 0xffffff;
  for (count = 0; (addr & 0x800000) == 0; count++)
  {
    list = rambase + (addr & 0x1fffff) / 4;
    len = LE32TOH(list[0]) >> 24;
    addr = LE32TOH(list[0]) & 0xffffff;
    preload(rambase + (addr & 0x1fffff) / 4);

    cpu_cycles += 10;
    if (len > 0)
      cpu_cycles += 5 + len;

    log_io(".chain %08x #%d\n", (list - rambase) * 4, len);

    if (len) {
      left = do_cmd_buffer(list + 1, len);
      if (left)
        log_anomaly("GPUdmaChain: discarded %d/%d words\n", left, len);
    }

    #define LD_THRESHOLD (8*1024)
    if (count >= LD_THRESHOLD) {
      if (count == LD_THRESHOLD) {
        ld_addr = addr;
        continue;
      }

      // loop detection marker
      // (bit23 set causes DMA error on real machine, so
      //  unlikely to be ever set by the game)
      list[0] |= HTOLE32(0x800000);
    }
  }

  if (ld_addr != 0) {
    // remove loop detection markers
    count -= LD_THRESHOLD + 2;
    addr = ld_addr & 0x1fffff;
    while (count-- > 0) {
      list = rambase + addr / 4;
      addr = LE32TOH(list[0]) & 0x1fffff;
      list[0] &= HTOLE32(~0x800000);
    }
  }

  gpu.state.last_list.frame = *gpu.state.frame_count;
  gpu.state.last_list.hcnt = *gpu.state.hcnt;
  gpu.state.last_list.cycles = cpu_cycles;
  gpu.state.last_list.addr = start_addr;

  return cpu_cycles;
}

void GPUreadDataMem(uint32_t *mem, int count)
{
  log_io("gpu_dma_read  %p %d\n", mem, count);

  if (unlikely(gpu.cmd_len > 0))
    flush_cmd_buffer();

  if (gpu.dma.h)
    do_vram_io(mem, count, 1);
}

uint32_t GPUreadData(void)
{
  uint32_t ret;

  if (unlikely(gpu.cmd_len > 0))
    flush_cmd_buffer();

  ret = gpu.gp0;
  if (gpu.dma.h)
    do_vram_io(&ret, 1, 1);

  log_io("gpu_read %08x\n", ret);
  return ret;
}

uint32_t GPUreadStatus(void)
{
  uint32_t ret;

  if (unlikely(gpu.cmd_len > 0))
    flush_cmd_buffer();

  ret = gpu.status;
  log_io("gpu_read_status %08x\n", ret);
  return ret;
}

struct GPUFreeze
{
  uint32_t ulFreezeVersion;      // should be always 1 for now (set by main emu)
  uint32_t ulStatus;             // current gpu status
  uint32_t ulControl[256];       // latest control register values
  unsigned char psxVRam[1024*1024*2]; // current VRam image (full 2 MB for ZN)
};

long GPUfreeze(uint32_t type, struct GPUFreeze *freeze)
{
  int i;

  switch (type) {
    case 1: // save
      if (gpu.cmd_len > 0)
        flush_cmd_buffer();
      memcpy(freeze->psxVRam, gpu.vram, 1024 * 512 * 2);
      memcpy(freeze->ulControl, gpu.regs, sizeof(gpu.regs));
      memcpy(freeze->ulControl + 0xe0, gpu.ex_regs, sizeof(gpu.ex_regs));
      freeze->ulStatus = gpu.status;
      break;
    case 0: // load
      memcpy(gpu.vram, freeze->psxVRam, 1024 * 512 * 2);
      memcpy(gpu.regs, freeze->ulControl, sizeof(gpu.regs));
      memcpy(gpu.ex_regs, freeze->ulControl + 0xe0, sizeof(gpu.ex_regs));
      gpu.status = freeze->ulStatus;
      gpu.cmd_len = 0;
      for (i = 8; i > 0; i--) {
        gpu.regs[i] ^= 1; // avoid reg change detection
        GPUwriteStatus((i << 24) | (gpu.regs[i] ^ 1));
      }
      renderer_sync_ecmds(gpu.ex_regs);
      renderer_update_caches(0, 0, 1024, 512);
      break;
  }

  return 1;
}

void GPUupdateLace(void)
{
  if (gpu.cmd_len > 0)
    flush_cmd_buffer();
  renderer_flush_queues();

  if (gpu.status & PSX_GPU_STATUS_BLANKING) {
    if (!gpu.state.blanked) {
      vout_blank();
      gpu.state.blanked = 1;
      gpu.state.fb_dirty = 1;
    }
    return;
  }

  if (!gpu.state.fb_dirty)
    return;

  if (gpu.frameskip.set) {
    if (!gpu.frameskip.frame_ready) {
      if (*gpu.state.frame_count - gpu.frameskip.last_flip_frame < 9)
        return;
      gpu.frameskip.active = 0;
    }
    gpu.frameskip.frame_ready = 0;
  }

  vout_update();
  gpu.state.fb_dirty = 0;
  gpu.state.blanked = 0;
}

void GPUvBlank(int is_vblank, int lcf)
{
  int interlace = gpu.state.allow_interlace
    && (gpu.status & PSX_GPU_STATUS_INTERLACE)
    && (gpu.status & PSX_GPU_STATUS_DHEIGHT);
  // interlace doesn't look nice on progressive displays,
  // so we have this "auto" mode here for games that don't read vram
  if (gpu.state.allow_interlace == 2
      && *gpu.state.frame_count - gpu.state.last_vram_read_frame > 1)
  {
    interlace = 0;
  }
  if (interlace || interlace != gpu.state.old_interlace) {
    gpu.state.old_interlace = interlace;

    if (gpu.cmd_len > 0)
      flush_cmd_buffer();
    renderer_flush_queues();
    renderer_set_interlace(interlace, !lcf);
  }
}

#include "../../frontend/plugin_lib.h"

void GPUrearmedCallbacks(const struct rearmed_cbs *cbs)
{
  gpu.frameskip.set = cbs->frameskip;
  gpu.frameskip.advice = &cbs->fskip_advice;
  gpu.frameskip.active = 0;
  gpu.frameskip.frame_ready = 1;
  gpu.state.hcnt = cbs->gpu_hcnt;
  gpu.state.frame_count = cbs->gpu_frame_count;
  gpu.state.allow_interlace = cbs->gpu_neon.allow_interlace;
  gpu.state.enhancement_enable = cbs->gpu_neon.enhancement_enable;

  gpu.mmap = cbs->mmap;
  gpu.munmap = cbs->munmap;

  // delayed vram mmap
  if (gpu.vram == NULL)
    map_vram();

  if (cbs->pl_vout_set_raw_vram)
    cbs->pl_vout_set_raw_vram(gpu.vram);
  renderer_set_config(cbs);
  vout_set_config(cbs);
}

// vim:shiftwidth=2:expandtab
Commit	Line	Data
	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2011-2012
	3	*
	4	* This work is licensed under the terms of any of these licenses
	5	* (at your option):
	6	* - GNU GPL, version 2 or later.
	7	* - GNU LGPL, version 2.1 or later.
	8	* See the COPYING file in the top-level directory.
	9	*/
	10
	11	#include <stdio.h>
	12	#include <string.h>
	13	#include "gpu.h"
	14
	15	#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
	16	#ifdef __GNUC__
	17	#define unlikely(x) __builtin_expect((x), 0)
	18	#define preload __builtin_prefetch
	19	#define noinline __attribute__((noinline))
	20	#else
	21	#define unlikely(x)
	22	#define preload(...)
	23	#define noinline
	24	#endif
	25
	26	#define gpu_log(fmt, ...) \
	27	printf("%d:%03d: " fmt, gpu.state.frame_count, gpu.state.hcnt, ##__VA_ARGS__)
	28
	29	//#define log_io gpu_log
	30	#define log_io(...)
	31	//#define log_anomaly gpu_log
	32	#define log_anomaly(...)
	33
	34	struct psx_gpu gpu;
	35
	36	static noinline int do_cmd_buffer(uint32_t *data, int count);
	37	static void finish_vram_transfer(int is_read);
	38
	39	static noinline void do_cmd_reset(void)
	40	{
	41	if (unlikely(gpu.cmd_len > 0))
	42	do_cmd_buffer(gpu.cmd_buffer, gpu.cmd_len);
	43	gpu.cmd_len = 0;
	44
	45	if (unlikely(gpu.dma.h > 0))
	46	finish_vram_transfer(gpu.dma_start.is_read);
	47	gpu.dma.h = 0;
	48	}
	49
	50	static noinline void do_reset(void)
	51	{
	52	unsigned int i;
	53
	54	do_cmd_reset();
	55
	56	memset(gpu.regs, 0, sizeof(gpu.regs));
	57	for (i = 0; i < sizeof(gpu.ex_regs) / sizeof(gpu.ex_regs[0]); i++)
	58	gpu.ex_regs[i] = (0xe0 + i) << 24;
	59	gpu.status = 0x14802000;
	60	gpu.gp0 = 0;
	61	gpu.regs[3] = 1;
	62	gpu.screen.hres = gpu.screen.w = 256;
	63	gpu.screen.vres = gpu.screen.h = 240;
	64	}
	65
	66	static noinline void update_width(void)
	67	{
	68	int sw = gpu.screen.x2 - gpu.screen.x1;
	69	if (sw <= 0 \|\| sw >= 2560)
	70	// full width
	71	gpu.screen.w = gpu.screen.hres;
	72	else
	73	gpu.screen.w = sw * gpu.screen.hres / 2560;
	74	}
	75
	76	static noinline void update_height(void)
	77	{
	78	// TODO: emulate this properly..
	79	int sh = gpu.screen.y2 - gpu.screen.y1;
	80	if (gpu.status & PSX_GPU_STATUS_DHEIGHT)
	81	sh *= 2;
	82	if (sh <= 0 \|\| sh > gpu.screen.vres)
	83	sh = gpu.screen.vres;
	84
	85	gpu.screen.h = sh;
	86	}
	87
	88	static noinline void decide_frameskip(void)
	89	{
	90	if (gpu.frameskip.active)
	91	gpu.frameskip.cnt++;
	92	else {
	93	gpu.frameskip.cnt = 0;
	94	gpu.frameskip.frame_ready = 1;
	95	}
	96
	97	if (!gpu.frameskip.active && *gpu.frameskip.advice)
	98	gpu.frameskip.active = 1;
	99	else if (gpu.frameskip.set > 0 && gpu.frameskip.cnt < gpu.frameskip.set)
	100	gpu.frameskip.active = 1;
	101	else
	102	gpu.frameskip.active = 0;
	103
	104	if (!gpu.frameskip.active && gpu.frameskip.pending_fill[0] != 0) {
	105	int dummy;
	106	do_cmd_list(gpu.frameskip.pending_fill, 3, &dummy);
	107	gpu.frameskip.pending_fill[0] = 0;
	108	}
	109	}
	110
	111	static noinline int decide_frameskip_allow(uint32_t cmd_e3)
	112	{
	113	// no frameskip if it decides to draw to display area,
	114	// but not for interlace since it'll most likely always do that
	115	uint32_t x = cmd_e3 & 0x3ff;
	116	uint32_t y = (cmd_e3 >> 10) & 0x3ff;
	117	gpu.frameskip.allow = (gpu.status & PSX_GPU_STATUS_INTERLACE) \|\|
	118	(uint32_t)(x - gpu.screen.x) >= (uint32_t)gpu.screen.w \|\|
	119	(uint32_t)(y - gpu.screen.y) >= (uint32_t)gpu.screen.h;
	120	return gpu.frameskip.allow;
	121	}
	122
	123	static noinline void get_gpu_info(uint32_t data)
	124	{
	125	switch (data & 0x0f) {
	126	case 0x02:
	127	case 0x03:
	128	case 0x04:
	129	case 0x05:
	130	gpu.gp0 = gpu.ex_regs[data & 7] & 0xfffff;
	131	break;
	132	case 0x06:
	133	gpu.gp0 = gpu.ex_regs[5] & 0xfffff;
	134	break;
	135	case 0x07:
	136	gpu.gp0 = 2;
	137	break;
	138	default:
	139	gpu.gp0 = 0;
	140	break;
	141	}
	142	}
	143
	144	// double, for overdraw guard
	145	#define VRAM_SIZE (1024 * 512 * 2 * 2)
	146
	147	static int map_vram(void)
	148	{
	149	gpu.vram = gpu.mmap(VRAM_SIZE);
	150	if (gpu.vram != NULL) {
	151	gpu.vram += 4096 / 2;
	152	return 0;
	153	}
	154	else {
	155	fprintf(stderr, "could not map vram, expect crashes\n");
	156	return -1;
	157	}
	158	}
	159
	160	long GPUinit(void)
	161	{
	162	int ret;
	163	ret = vout_init();
	164	ret \|= renderer_init();
	165
	166	gpu.state.frame_count = &gpu.zero;
	167	gpu.state.hcnt = &gpu.zero;
	168	gpu.frameskip.active = 0;
	169	gpu.cmd_len = 0;
	170	do_reset();
	171
	172	if (gpu.mmap != NULL) {
	173	if (map_vram() != 0)
	174	ret = -1;
	175	}
	176	return ret;
	177	}
	178
	179	long GPUshutdown(void)
	180	{
	181	long ret;
	182
	183	renderer_finish();
	184	ret = vout_finish();
	185	if (gpu.vram != NULL) {
	186	gpu.vram -= 4096 / 2;
	187	gpu.munmap(gpu.vram, VRAM_SIZE);
	188	}
	189	gpu.vram = NULL;
	190
	191	return ret;
	192	}
	193
	194	void GPUwriteStatus(uint32_t data)
	195	{
	196	static const short hres[8] = { 256, 368, 320, 384, 512, 512, 640, 640 };
	197	static const short vres[4] = { 240, 480, 256, 480 };
	198	uint32_t cmd = data >> 24;
	199
	200	if (cmd < ARRAY_SIZE(gpu.regs)) {
	201	if (cmd > 1 && cmd != 5 && gpu.regs[cmd] == data)
	202	return;
	203	gpu.regs[cmd] = data;
	204	}
	205
	206	gpu.state.fb_dirty = 1;
	207
	208	switch (cmd) {
	209	case 0x00:
	210	do_reset();
	211	break;
	212	case 0x01:
	213	do_cmd_reset();
	214	break;
	215	case 0x03:
	216	if (data & 1)
	217	gpu.status \|= PSX_GPU_STATUS_BLANKING;
	218	else
	219	gpu.status &= ~PSX_GPU_STATUS_BLANKING;
	220	break;
	221	case 0x04:
	222	gpu.status &= ~PSX_GPU_STATUS_DMA_MASK;
	223	gpu.status \|= PSX_GPU_STATUS_DMA(data & 3);
	224	break;
	225	case 0x05:
	226	gpu.screen.x = data & 0x3ff;
	227	gpu.screen.y = (data >> 10) & 0x1ff;
	228	if (gpu.frameskip.set) {
	229	decide_frameskip_allow(gpu.ex_regs[3]);
	230	if (gpu.frameskip.last_flip_frame != *gpu.state.frame_count) {
	231	decide_frameskip();
	232	gpu.frameskip.last_flip_frame = *gpu.state.frame_count;
	233	}
	234	}
	235	break;
	236	case 0x06:
	237	gpu.screen.x1 = data & 0xfff;
	238	gpu.screen.x2 = (data >> 12) & 0xfff;
	239	update_width();
	240	break;
	241	case 0x07:
	242	gpu.screen.y1 = data & 0x3ff;
	243	gpu.screen.y2 = (data >> 10) & 0x3ff;
	244	update_height();
	245	break;
	246	case 0x08:
	247	gpu.status = (gpu.status & ~0x7f0000) \| ((data & 0x3F) << 17) \| ((data & 0x40) << 10);
	248	gpu.screen.hres = hres[(gpu.status >> 16) & 7];
	249	gpu.screen.vres = vres[(gpu.status >> 19) & 3];
	250	update_width();
	251	update_height();
	252	renderer_notify_res_change();
	253	break;
	254	default:
	255	if ((cmd & 0xf0) == 0x10)
	256	get_gpu_info(data);
	257	break;
	258	}
	259
	260	#ifdef GPUwriteStatus_ext
	261	GPUwriteStatus_ext(data);
	262	#endif
	263	}
	264
	265	const unsigned char cmd_lengths[256] =
	266	{
	267	0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	268	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	269	3, 3, 3, 3, 6, 6, 6, 6, 4, 4, 4, 4, 8, 8, 8, 8, // 20
	270	5, 5, 5, 5, 8, 8, 8, 8, 7, 7, 7, 7, 11, 11, 11, 11,
	271	2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, // 40
	272	3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
	273	2, 2, 2, 2, 3, 3, 3, 3, 1, 1, 1, 1, 0, 0, 0, 0, // 60
	274	1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2,
	275	3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80
	276	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	277	2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // a0
	278	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	279	2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // c0
	280	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	281	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // e0
	282	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
	283	};
	284
	285	#define VRAM_MEM_XY(x, y) &gpu.vram[(y) * 1024 + (x)]
	286
	287	static inline void do_vram_line(int x, int y, uint16_t *mem, int l, int is_read)
	288	{
	289	uint16_t *vram = VRAM_MEM_XY(x, y);
	290	if (is_read)
	291	memcpy(mem, vram, l * 2);
	292	else
	293	memcpy(vram, mem, l * 2);
	294	}
	295
	296	static int do_vram_io(uint32_t *data, int count, int is_read)
	297	{
	298	int count_initial = count;
	299	uint16_t sdata = (uint16_t )data;
	300	int x = gpu.dma.x, y = gpu.dma.y;
	301	int w = gpu.dma.w, h = gpu.dma.h;
	302	int o = gpu.dma.offset;
	303	int l;
	304	count *= 2; // operate in 16bpp pixels
	305
	306	if (gpu.dma.offset) {
	307	l = w - gpu.dma.offset;
	308	if (count < l)
	309	l = count;
	310
	311	do_vram_line(x + o, y, sdata, l, is_read);
	312
	313	if (o + l < w)
	314	o += l;
	315	else {
	316	o = 0;
	317	y++;
	318	h--;
	319	}
	320	sdata += l;
	321	count -= l;
	322	}
	323
	324	for (; h > 0 && count >= w; sdata += w, count -= w, y++, h--) {
	325	y &= 511;
	326	do_vram_line(x, y, sdata, w, is_read);
	327	}
	328
	329	if (h > 0) {
	330	if (count > 0) {
	331	y &= 511;
	332	do_vram_line(x, y, sdata, count, is_read);
	333	o = count;
	334	count = 0;
	335	}
	336	}
	337	else
	338	finish_vram_transfer(is_read);
	339	gpu.dma.y = y;
	340	gpu.dma.h = h;
	341	gpu.dma.offset = o;
	342
	343	return count_initial - count / 2;
	344	}
	345
	346	static void start_vram_transfer(uint32_t pos_word, uint32_t size_word, int is_read)
	347	{
	348	if (gpu.dma.h)
	349	log_anomaly("start_vram_transfer while old unfinished\n");
	350
	351	gpu.dma.x = pos_word & 0x3ff;
	352	gpu.dma.y = (pos_word >> 16) & 0x1ff;
	353	gpu.dma.w = ((size_word - 1) & 0x3ff) + 1;
	354	gpu.dma.h = (((size_word >> 16) - 1) & 0x1ff) + 1;
	355	gpu.dma.offset = 0;
	356	gpu.dma.is_read = is_read;
	357	gpu.dma_start = gpu.dma;
	358
	359	renderer_flush_queues();
	360	if (is_read) {
	361	gpu.status \|= PSX_GPU_STATUS_IMG;
	362	// XXX: wrong for width 1
	363	memcpy(&gpu.gp0, VRAM_MEM_XY(gpu.dma.x, gpu.dma.y), 4);
	364	gpu.state.last_vram_read_frame = *gpu.state.frame_count;
	365	}
	366
	367	log_io("start_vram_transfer %c (%d, %d) %dx%d\n", is_read ? 'r' : 'w',
	368	gpu.dma.x, gpu.dma.y, gpu.dma.w, gpu.dma.h);
	369	}
	370
	371	static void finish_vram_transfer(int is_read)
	372	{
	373	if (is_read)
	374	gpu.status &= ~PSX_GPU_STATUS_IMG;
	375	else
	376	renderer_update_caches(gpu.dma_start.x, gpu.dma_start.y,
	377	gpu.dma_start.w, gpu.dma_start.h);
	378	}
	379
	380	static noinline int do_cmd_list_skip(uint32_t data, int count, int last_cmd)
	381	{
	382	int cmd = 0, pos = 0, len, dummy, v;
	383	int skip = 1;
	384
	385	gpu.frameskip.pending_fill[0] = 0;
	386
	387	while (pos < count && skip) {
	388	uint32_t *list = data + pos;
	389	cmd = LE32TOH(list[0]) >> 24;
	390	len = 1 + cmd_lengths[cmd];
	391
	392	switch (cmd) {
	393	case 0x02:
	394	if ((LE32TOH(list[2]) & 0x3ff) > gpu.screen.w \|\| ((LE32TOH(list[2]) >> 16) & 0x1ff) > gpu.screen.h)
	395	// clearing something large, don't skip
	396	do_cmd_list(list, 3, &dummy);
	397	else
	398	memcpy(gpu.frameskip.pending_fill, list, 3 * 4);
	399	break;
	400	case 0x24 ... 0x27:
	401	case 0x2c ... 0x2f:
	402	case 0x34 ... 0x37:
	403	case 0x3c ... 0x3f:
	404	gpu.ex_regs[1] &= ~0x1ff;
	405	gpu.ex_regs[1] \|= LE32TOH(list[4 + ((cmd >> 4) & 1)]) & 0x1ff;
	406	break;
	407	case 0x48 ... 0x4F:
	408	for (v = 3; pos + v < count; v++)
	409	{
	410	if ((list[v] & HTOLE32(0xf000f000)) == HTOLE32(0x50005000))
	411	break;
	412	}
	413	len += v - 3;
	414	break;
	415	case 0x58 ... 0x5F:
	416	for (v = 4; pos + v < count; v += 2)
	417	{
	418	if ((list[v] & HTOLE32(0xf000f000)) == HTOLE32(0x50005000))
	419	break;
	420	}
	421	len += v - 4;
	422	break;
	423	default:
	424	if (cmd == 0xe3)
	425	skip = decide_frameskip_allow(LE32TOH(list[0]));
	426	if ((cmd & 0xf8) == 0xe0)
	427	gpu.ex_regs[cmd & 7] = LE32TOH(list[0]);
	428	break;
	429	}
	430
	431	if (pos + len > count) {
	432	cmd = -1;
	433	break; // incomplete cmd
	434	}
	435	if (0xa0 <= cmd && cmd <= 0xdf)
	436	break; // image i/o
	437
	438	pos += len;
	439	}
	440
	441	renderer_sync_ecmds(gpu.ex_regs);
	442	*last_cmd = cmd;
	443	return pos;
	444	}
	445
	446	static noinline int do_cmd_buffer(uint32_t *data, int count)
	447	{
	448	int cmd, pos;
	449	uint32_t old_e3 = gpu.ex_regs[3];
	450	int vram_dirty = 0;
	451
	452	// process buffer
	453	for (pos = 0; pos < count; )
	454	{
	455	if (gpu.dma.h && !gpu.dma_start.is_read) { // XXX: need to verify
	456	vram_dirty = 1;
	457	pos += do_vram_io(data + pos, count - pos, 0);
	458	if (pos == count)
	459	break;
	460	}
	461
	462	cmd = LE32TOH(data[pos]) >> 24;
	463	if (0xa0 <= cmd && cmd <= 0xdf) {
	464	if (unlikely((pos+2) >= count)) {
	465	// incomplete vram write/read cmd, can't consume yet
	466	cmd = -1;
	467	break;
	468	}
	469
	470	// consume vram write/read cmd
	471	start_vram_transfer(LE32TOH(data[pos + 1]), LE32TOH(data[pos + 2]), (cmd & 0xe0) == 0xc0);
	472	pos += 3;
	473	continue;
	474	}
	475
	476	// 0xex cmds might affect frameskip.allow, so pass to do_cmd_list_skip
	477	if (gpu.frameskip.active && (gpu.frameskip.allow \|\| ((LE32TOH(data[pos]) >> 24) & 0xf0) == 0xe0))
	478	pos += do_cmd_list_skip(data + pos, count - pos, &cmd);
	479	else {
	480	pos += do_cmd_list(data + pos, count - pos, &cmd);
	481	vram_dirty = 1;
	482	}
	483
	484	if (cmd == -1)
	485	// incomplete cmd
	486	break;
	487	}
	488
	489	gpu.status &= ~0x1fff;
	490	gpu.status \|= gpu.ex_regs[1] & 0x7ff;
	491	gpu.status \|= (gpu.ex_regs[6] & 3) << 11;
	492
	493	gpu.state.fb_dirty \|= vram_dirty;
	494
	495	if (old_e3 != gpu.ex_regs[3])
	496	decide_frameskip_allow(gpu.ex_regs[3]);
	497
	498	return count - pos;
	499	}
	500
	501	static void flush_cmd_buffer(void)
	502	{
	503	int left = do_cmd_buffer(gpu.cmd_buffer, gpu.cmd_len);
	504	if (left > 0)
	505	memmove(gpu.cmd_buffer, gpu.cmd_buffer + gpu.cmd_len - left, left * 4);
	506	gpu.cmd_len = left;
	507	}
	508
	509	void GPUwriteDataMem(uint32_t *mem, int count)
	510	{
	511	int left;
	512
	513	log_io("gpu_dma_write %p %d\n", mem, count);
	514
	515	if (unlikely(gpu.cmd_len > 0))
	516	flush_cmd_buffer();
	517
	518	left = do_cmd_buffer(mem, count);
	519	if (left)
	520	log_anomaly("GPUwriteDataMem: discarded %d/%d words\n", left, count);
	521	}
	522
	523	void GPUwriteData(uint32_t data)
	524	{
	525	log_io("gpu_write %08x\n", data);
	526	gpu.cmd_buffer[gpu.cmd_len++] = HTOLE32(data);
	527	if (gpu.cmd_len >= CMD_BUFFER_LEN)
	528	flush_cmd_buffer();
	529	}
	530
	531	long GPUdmaChain(uint32_t *rambase, uint32_t start_addr)
	532	{
	533	uint32_t addr, *list, ld_addr = 0;
	534	int len, left, count;
	535	long cpu_cycles = 0;
	536
	537	preload(rambase + (start_addr & 0x1fffff) / 4);
	538
	539	if (unlikely(gpu.cmd_len > 0))
	540	flush_cmd_buffer();
	541
	542	log_io("gpu_dma_chain\n");
	543	addr = start_addr & 0xffffff;
	544	for (count = 0; (addr & 0x800000) == 0; count++)
	545	{
	546	list = rambase + (addr & 0x1fffff) / 4;
	547	len = LE32TOH(list[0]) >> 24;
	548	addr = LE32TOH(list[0]) & 0xffffff;
	549	preload(rambase + (addr & 0x1fffff) / 4);
	550
	551	cpu_cycles += 10;
	552	if (len > 0)
	553	cpu_cycles += 5 + len;
	554
	555	log_io(".chain %08x #%d\n", (list - rambase) * 4, len);
	556
	557	if (len) {
	558	left = do_cmd_buffer(list + 1, len);
	559	if (left)
	560	log_anomaly("GPUdmaChain: discarded %d/%d words\n", left, len);
	561	}
	562
	563	#define LD_THRESHOLD (8*1024)
	564	if (count >= LD_THRESHOLD) {
	565	if (count == LD_THRESHOLD) {
	566	ld_addr = addr;
	567	continue;
	568	}
	569
	570	// loop detection marker
	571	// (bit23 set causes DMA error on real machine, so
	572	// unlikely to be ever set by the game)
	573	list[0] \|= HTOLE32(0x800000);
	574	}
	575	}
	576
	577	if (ld_addr != 0) {
	578	// remove loop detection markers
	579	count -= LD_THRESHOLD + 2;
	580	addr = ld_addr & 0x1fffff;
	581	while (count-- > 0) {
	582	list = rambase + addr / 4;
	583	addr = LE32TOH(list[0]) & 0x1fffff;
	584	list[0] &= HTOLE32(~0x800000);
	585	}
	586	}
	587
	588	gpu.state.last_list.frame = *gpu.state.frame_count;
	589	gpu.state.last_list.hcnt = *gpu.state.hcnt;
	590	gpu.state.last_list.cycles = cpu_cycles;
	591	gpu.state.last_list.addr = start_addr;
	592
	593	return cpu_cycles;
	594	}
	595
	596	void GPUreadDataMem(uint32_t *mem, int count)
	597	{
	598	log_io("gpu_dma_read %p %d\n", mem, count);
	599
	600	if (unlikely(gpu.cmd_len > 0))
	601	flush_cmd_buffer();
	602
	603	if (gpu.dma.h)
	604	do_vram_io(mem, count, 1);
	605	}
	606
	607	uint32_t GPUreadData(void)
	608	{
	609	uint32_t ret;
	610
	611	if (unlikely(gpu.cmd_len > 0))
	612	flush_cmd_buffer();
	613
	614	ret = gpu.gp0;
	615	if (gpu.dma.h)
	616	do_vram_io(&ret, 1, 1);
	617
	618	log_io("gpu_read %08x\n", ret);
	619	return ret;
	620	}
	621
	622	uint32_t GPUreadStatus(void)
	623	{
	624	uint32_t ret;
	625
	626	if (unlikely(gpu.cmd_len > 0))
	627	flush_cmd_buffer();
	628
	629	ret = gpu.status;
	630	log_io("gpu_read_status %08x\n", ret);
	631	return ret;
	632	}
	633
	634	struct GPUFreeze
	635	{
	636	uint32_t ulFreezeVersion; // should be always 1 for now (set by main emu)
	637	uint32_t ulStatus; // current gpu status
	638	uint32_t ulControl[256]; // latest control register values
	639	unsigned char psxVRam[102410242]; // current VRam image (full 2 MB for ZN)
	640	};
	641
	642	long GPUfreeze(uint32_t type, struct GPUFreeze *freeze)
	643	{
	644	int i;
	645
	646	switch (type) {
	647	case 1: // save
	648	if (gpu.cmd_len > 0)
	649	flush_cmd_buffer();
	650	memcpy(freeze->psxVRam, gpu.vram, 1024 * 512 * 2);
	651	memcpy(freeze->ulControl, gpu.regs, sizeof(gpu.regs));
	652	memcpy(freeze->ulControl + 0xe0, gpu.ex_regs, sizeof(gpu.ex_regs));
	653	freeze->ulStatus = gpu.status;
	654	break;
	655	case 0: // load
	656	memcpy(gpu.vram, freeze->psxVRam, 1024 * 512 * 2);
	657	memcpy(gpu.regs, freeze->ulControl, sizeof(gpu.regs));
	658	memcpy(gpu.ex_regs, freeze->ulControl + 0xe0, sizeof(gpu.ex_regs));
	659	gpu.status = freeze->ulStatus;
	660	gpu.cmd_len = 0;
	661	for (i = 8; i > 0; i--) {
	662	gpu.regs[i] ^= 1; // avoid reg change detection
	663	GPUwriteStatus((i << 24) \| (gpu.regs[i] ^ 1));
	664	}
	665	renderer_sync_ecmds(gpu.ex_regs);
	666	renderer_update_caches(0, 0, 1024, 512);
	667	break;
	668	}
	669
	670	return 1;
	671	}
	672
	673	void GPUupdateLace(void)
	674	{
	675	if (gpu.cmd_len > 0)
	676	flush_cmd_buffer();
	677	renderer_flush_queues();
	678
	679	if (gpu.status & PSX_GPU_STATUS_BLANKING) {
	680	if (!gpu.state.blanked) {
	681	vout_blank();
	682	gpu.state.blanked = 1;
	683	gpu.state.fb_dirty = 1;
	684	}
	685	return;
	686	}
	687
	688	if (!gpu.state.fb_dirty)
	689	return;
	690
	691	if (gpu.frameskip.set) {
	692	if (!gpu.frameskip.frame_ready) {
	693	if (*gpu.state.frame_count - gpu.frameskip.last_flip_frame < 9)
	694	return;
	695	gpu.frameskip.active = 0;
	696	}
	697	gpu.frameskip.frame_ready = 0;
	698	}
	699
	700	vout_update();
	701	gpu.state.fb_dirty = 0;
	702	gpu.state.blanked = 0;
	703	}
	704
	705	void GPUvBlank(int is_vblank, int lcf)
	706	{
	707	int interlace = gpu.state.allow_interlace
	708	&& (gpu.status & PSX_GPU_STATUS_INTERLACE)
	709	&& (gpu.status & PSX_GPU_STATUS_DHEIGHT);
	710	// interlace doesn't look nice on progressive displays,
	711	// so we have this "auto" mode here for games that don't read vram
	712	if (gpu.state.allow_interlace == 2
	713	&& *gpu.state.frame_count - gpu.state.last_vram_read_frame > 1)
	714	{
	715	interlace = 0;
	716	}
	717	if (interlace \|\| interlace != gpu.state.old_interlace) {
	718	gpu.state.old_interlace = interlace;
	719
	720	if (gpu.cmd_len > 0)
	721	flush_cmd_buffer();
	722	renderer_flush_queues();
	723	renderer_set_interlace(interlace, !lcf);
	724	}
	725	}
	726
	727	#include "../../frontend/plugin_lib.h"
	728
	729	void GPUrearmedCallbacks(const struct rearmed_cbs *cbs)
	730	{
	731	gpu.frameskip.set = cbs->frameskip;
	732	gpu.frameskip.advice = &cbs->fskip_advice;
	733	gpu.frameskip.active = 0;
	734	gpu.frameskip.frame_ready = 1;
	735	gpu.state.hcnt = cbs->gpu_hcnt;
	736	gpu.state.frame_count = cbs->gpu_frame_count;
	737	gpu.state.allow_interlace = cbs->gpu_neon.allow_interlace;
	738	gpu.state.enhancement_enable = cbs->gpu_neon.enhancement_enable;
	739
	740	gpu.mmap = cbs->mmap;
	741	gpu.munmap = cbs->munmap;
	742
	743	// delayed vram mmap
	744	if (gpu.vram == NULL)
	745	map_vram();
	746
	747	if (cbs->pl_vout_set_raw_vram)
	748	cbs->pl_vout_set_raw_vram(gpu.vram);
	749	renderer_set_config(cbs);
	750	vout_set_config(cbs);
	751	}
	752
	753	// vim:shiftwidth=2:expandtab