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vidhrdw
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hydra.c
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2000-04-23
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/***************************************************************************
vidhrdw/hydra.c
Functions to emulate the video hardware of the machine.
****************************************************************************
Playfield encoding
------------------
1 16-bit word is used
Word 1:
Bit 15 = horizontal flip
Bits 11-14 = palette
Bits 0-12 = image index
Motion Object encoding
----------------------
4 16-bit words are used
Word 1:
Bit 15 = horizontal flip
Bits 0-14 = image index
Word 2:
Bits 7-15 = Y position
Bits 0-3 = height in tiles
Word 3:
Bits 3-10 = link to the next image to display
Word 4:
Bits 6-14 = X position
Bit 4 = use current X position + 16 for next sprite
Bits 0-3 = palette
Alpha layer encoding
--------------------
1 16-bit word is used
Word 1:
Bit 15 = horizontal flip
Bit 12-14 = palette
Bits 0-11 = image index
***************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "vidhrdw/generic.h"
/* Note: if this is set to 1, it must also be set in the driver */
#define HIGH_RES 0
#define XCHARS 42
#define YCHARS 30
#define XDIM (XCHARS*(8 << HIGH_RES))
#define YDIM (YCHARS*8)
#define DEBUG_VIDEO 0
/*************************************
*
* Globals
*
*************************************/
struct rectangle hydra_mo_area;
UINT32 hydra_mo_priority_offset;
INT32 hydra_pf_xoffset;
/*************************************
*
* Structures
*
*************************************/
struct mo_params
{
int xhold;
struct osd_bitmap *bitmap;
};
struct mo_sort_entry
{
struct mo_sort_entry *next;
int entry;
};
/*************************************
*
* Statics
*
*************************************/
static struct atarigen_pf_state pf_state;
static UINT16 current_control;
/*************************************
*
* Prototypes
*
*************************************/
static const UINT8 *update_palette(void);
static void pf_color_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param);
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param);
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param);
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param);
#if DEBUG_VIDEO
static int debug(void);
#endif
/*************************************
*
* Video system start
*
*************************************/
int hydra_vh_start(void)
{
static struct atarigen_pf_desc pf_desc =
{
8 << HIGH_RES, 8, /* width/height of each tile */
64, 64 /* number of tiles in each direction */
};
/* reset statics */
memset(&pf_state, 0, sizeof(pf_state));
current_control = 0;
/* add the top bit to the playfield graphics */
if (Machine->gfx[0])
{
const UINT8 *src = &memory_region(REGION_GFX1)[0x80000];
unsigned int *pen_usage = Machine->gfx[0]->pen_usage;
int n, h, w;
UINT8 *dst = Machine->gfx[0]->gfxdata;
for (n = 0; n < Machine->gfx[0]->total_elements; n ++)
{
unsigned int usage = 0;
for (h = 0; h < 8; h++)
{
UINT8 bits = *src++;
for (w = 0; w < 8; w++, dst += (1 << HIGH_RES), bits <<= 1)
{
dst[0] = (dst[0] & 0x0f) | ((bits >> 3) & 0x10);
if (HIGH_RES)
dst[1] = (dst[1] & 0x0f) | ((bits >> 3) & 0x10);
usage |= 1 << dst[0];
}
}
/* update the tile's pen usage */
if (pen_usage)
*pen_usage++ = usage;
}
}
/* decode the motion objects */
if (atarigen_rle_init(REGION_GFX3, 0x200))
return 1;
/* initialize the playfield */
if (atarigen_pf_init(&pf_desc))
{
atarigen_rle_free();
return 1;
}
return 0;
}
/*************************************
*
* Video system shutdown
*
*************************************/
void hydra_vh_stop(void)
{
atarigen_rle_free();
atarigen_pf_free();
}
/*************************************
*
* Playfield RAM write handler
*
*************************************/
WRITE_HANDLER( hydra_playfieldram_w )
{
int oldword = READ_WORD(&atarigen_playfieldram[offset]);
int newword = COMBINE_WORD(oldword, data);
if (oldword != newword)
{
WRITE_WORD(&atarigen_playfieldram[offset], newword);
atarigen_pf_dirty[(offset / 2) & 0xfff] = 0xff;
}
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
WRITE_HANDLER( hydra_mo_control_w )
{
logerror("MOCONT = %d (scan = %d)\n", data, cpu_getscanline());
/* set the control value */
current_control = data;
}
void hydra_scanline_update(int scanline)
{
UINT16 *base = (UINT16 *)&atarigen_alpharam[((scanline / 8) * 64 + 47) * 2];
int i;
if (scanline == 0) logerror("-------\n");
/* keep in range */
if ((UINT8 *)base >= &atarigen_alpharam[atarigen_alpharam_size])
return;
/* update the current parameters */
for (i = 0; i < 8; i++)
{
int word;
word = base[i * 2 + 1];
if (word & 0x8000)
pf_state.hscroll = (((word >> 6) + hydra_pf_xoffset) & 0x1ff) << HIGH_RES;
word = base[i * 2 + 2];
if (word & 0x8000)
{
/* a new vscroll latches the offset into a counter; we must adjust for this */
int offset = scanline + i;
if (offset >= 256)
offset -= 256;
pf_state.vscroll = ((word >> 6) - offset) & 0x1ff;
pf_state.param[0] = word & 7;
}
/* update the playfield with the new parameters */
atarigen_pf_update(&pf_state, scanline + i);
}
}
/*************************************
*
* Main refresh
*
*************************************/
void hydra_vh_screenrefresh(struct osd_bitmap *bitmap, int full_refresh)
{
/* a note about this: I don't see how to compute the MO ROM checksums, so these
are just the values Pit Fighter is expecting. Hydra never checks. */
static UINT16 mo_checksum[16] =
{
0xc289, 0x3103, 0x2b8d, 0xe048, 0xc12e, 0x0ede, 0x2cd7, 0x7dc8,
0x58fc, 0xb877, 0x9449, 0x59d4, 0x8b63, 0x241b, 0xa3de, 0x4724
};
struct mo_sort_entry sort_entry[256];
struct mo_sort_entry *list_head[256];
struct mo_sort_entry *current;
struct mo_params modata;
const struct GfxElement *gfx;
int x, y, offs;
#if DEBUG_VIDEO
int xorval = debug();
#endif
/* special case: checksum the sprite ROMs */
if (READ_WORD(&atarigen_spriteram[0]) == 0x000f)
{
for (x = 1; x < 5; x++)
if (READ_WORD(&atarigen_spriteram[x * 2]) != 0)
break;
if (x == 5)
{
logerror("Wrote checksums\n");
for (x = 0; x < 16; x++)
WRITE_WORD(&atarigen_spriteram[x * 2], mo_checksum[x]);
}
}
/* update the palette, and mark things dirty */
if (update_palette())
memset(atarigen_pf_dirty, 0xff, atarigen_playfieldram_size / 2);
/* draw the playfield */
memset(atarigen_pf_visit, 0, 64*64);
atarigen_pf_process(pf_render_callback, bitmap, &Machine->drv->visible_area);
/* draw the motion objects */
modata.xhold = 1000;
modata.bitmap = bitmap;
/* sort the motion objects into their proper priorities */
memset(list_head, 0, sizeof(list_head));
for (x = 0; x < 256; x++)
{
int priority = READ_WORD(&atarigen_spriteram[x * 16 + hydra_mo_priority_offset]) & 0xff;
sort_entry[x].entry = x;
sort_entry[x].next = list_head[priority];
list_head[priority] = &sort_entry[x];
}
/* now loop back and process */
for (x = 1; x < 256; x++)
for (current = list_head[x]; current; current = current->next)
mo_render_callback((const UINT16 *)&atarigen_spriteram[current->entry * 16], &hydra_mo_area, &modata);
/* draw the alphanumerics */
gfx = Machine->gfx[1];
for (y = 0; y < YCHARS; y++)
for (x = 0, offs = y * 64; x < XCHARS; x++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = data & 0xfff;
int color = (data >> 12) & 15;
int opaque = data & 0x8000;
drawgfx(bitmap, gfx, code, color, 0, 0, (8 << HIGH_RES) * x, 8 * y, 0, opaque ? TRANSPARENCY_NONE : TRANSPARENCY_PEN, 0);
}
/* update onscreen messages */
atarigen_update_messages();
}
/*************************************
*
* Palette management
*
*************************************/
static const UINT8 *update_palette(void)
{
UINT16 mo_map[16+4], al_map[16];
UINT32 pf_map[8];
const unsigned int *usage;
int i, j, x, y, offs;
/* reset color tracking */
memset(mo_map, 0, sizeof(mo_map));
memset(pf_map, 0, sizeof(pf_map));
memset(al_map, 0, sizeof(al_map));
palette_init_used_colors();
/* update color usage for the playfield */
atarigen_pf_process(pf_color_callback, pf_map, &Machine->drv->visible_area);
/* update color usage for the mo's */
for (j = 0; j < 256; j++)
{
int priority = READ_WORD(&atarigen_spriteram[j * 16 + hydra_mo_priority_offset]) & 0xff;
if (priority != 0)
mo_color_callback((const UINT16 *)&atarigen_spriteram[j * 16], &Machine->drv->visible_area, mo_map);
}
/* update color usage for the alphanumerics */
usage = Machine->gfx[1]->pen_usage;
for (y = 0; y < YCHARS; y++)
for (x = 0, offs = y * 64; x < XCHARS; x++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = data & 0xfff;
int color = (data >> 12) & 15;
al_map[color] |= usage[code];
}
/* rebuild the playfield palette */
for (i = 0; i < 8; i++)
{
UINT32 used = pf_map[i];
if (used)
for (j = 0; j < 32; j++)
if (used & (1 << j))
palette_used_colors[0x300 + i * 32 + j] = PALETTE_COLOR_USED;
}
/* rebuild the motion object palette */
for (i = 0; i < 16; i++)
{
UINT16 used = mo_map[i];
if (used)
{
for (j = 0; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x200 + i * 16 + j] = PALETTE_COLOR_USED;
}
}
/* rebuild the alphanumerics palette */
for (i = 0; i < 16; i++)
{
UINT16 used = al_map[i];
if (used)
{
if (i < 8)
palette_used_colors[0x100 + i * 16 + 0] = PALETTE_COLOR_TRANSPARENT;
else if (used & 0x0001)
palette_used_colors[0x100 + i * 16 + 0] = PALETTE_COLOR_USED;
for (j = 1; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x100 + i * 16 + j] = PALETTE_COLOR_USED;
}
}
/* recalc */
return palette_recalc();
}
/*************************************
*
* Playfield palette
*
*************************************/
static void pf_color_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const unsigned int *usage = Machine->gfx[0]->pen_usage;
UINT32 *colormap = (UINT32 *)param;
int bankbase = state->param[0] * 0x1000;
int x, y;
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int code = bankbase + (data & 0x0fff);
int color = (data >> 12) & 7;
colormap[color] |= usage[code];
/* also mark unvisited tiles dirty */
if (!atarigen_pf_visit[offs]) atarigen_pf_dirty[offs] = 0xff;
}
}
/*************************************
*
* Playfield rendering
*
*************************************/
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const struct GfxElement *gfx = Machine->gfx[0];
int bankbase = state->param[0] * 0x1000;
struct osd_bitmap *bitmap = param;
int x, y;
/* first update any tiles whose color is out of date */
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = (data >> 12) & 7;
if (atarigen_pf_dirty[offs] != state->param[0])
{
int code = bankbase + (data & 0x0fff);
int hflip = data & 0x8000;
drawgfx(atarigen_pf_bitmap, gfx, code, color, hflip, 0, (8 << HIGH_RES) * x, 8 * y, 0, TRANSPARENCY_NONE, 0);
atarigen_pf_dirty[offs] = state->param[0];
}
/* track the tiles we've visited */
atarigen_pf_visit[offs] = 1;
}
/* then blast the result */
x = -state->hscroll;
y = -state->vscroll;
copyscrollbitmap(bitmap, atarigen_pf_bitmap, 1, &x, 1, &y, clip, TRANSPARENCY_NONE, 0);
}
/*************************************
*
* Motion object palette
*
*************************************/
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
UINT16 *colormap = param;
int scale = data[4];
int code = data[0] & 0x7fff;
if (scale > 0x0000 && code < atarigen_rle_count)
{
const struct atarigen_rle_descriptor *rle = &atarigen_rle_info[code];
int colorentry = (data[1] & 0xff) >> 4;
int colorshift = (data[1] & 0x0f);
int usage = rle->pen_usage;
int bpp = rle->bpp;
if (bpp == 4)
{
colormap[colorentry + 0] |= usage << colorshift;
if (colorshift)
colormap[colorentry + 1] |= usage >> (16 - colorshift);
}
else if (bpp == 5)
{
colormap[colorentry + 0] |= usage << colorshift;
colormap[colorentry + 1] |= usage >> (16 - colorshift);
if (colorshift)
colormap[colorentry + 2] |= usage >> (32 - colorshift);
}
else
{
colormap[colorentry + 0] |= usage << colorshift;
colormap[colorentry + 1] |= usage >> (16 - colorshift);
if (colorshift)
colormap[colorentry + 2] |= usage >> (32 - colorshift);
usage = rle->pen_usage_hi;
colormap[colorentry + 2] |= usage << colorshift;
colormap[colorentry + 3] |= usage >> (16 - colorshift);
if (colorshift)
colormap[colorentry + 4] |= usage >> (32 - colorshift);
}
}
}
/*************************************
*
* Motion object rendering
*
*************************************/
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
int scale = data[4];
int code = data[0] & 0x7fff;
if (scale > 0x0000 && code < atarigen_rle_count)
{
const struct mo_params *modata = param;
struct osd_bitmap *bitmap = modata->bitmap;
int hflip = data[0] & 0x8000;
int color = data[1] & 0xff;
int x = ((INT16)data[2] >> 6);
int y = ((INT16)data[3] >> 6);
atarigen_rle_render(bitmap, &atarigen_rle_info[code], color, hflip, 0, (x << HIGH_RES) + clip->min_x, y, scale << HIGH_RES, scale, clip);
}
}
/*************************************
*
* Debugging
*
*************************************/
#if DEBUG_VIDEO
static void mo_print_callback(struct osd_bitmap *bitmap, struct rectangle *clip, UINT16 *data, void *param)
{
int code = (data[0] & 0x7fff);
int vsize = (data[1] & 15) + 1;
int xpos = (data[3] >> 7);
int ypos = (data[1] >> 7);
int color = data[3] & 15;
int hflip = data[0] & 0x8000;
FILE *f = (FILE *)param;
fprintf(f, "P=%04X X=%03X Y=%03X SIZE=%X COL=%X FLIP=%X -- DATA=%04X %04X %04X %04X\n",
code, xpos, ypos, vsize, color, hflip >> 15, data[0], data[1], data[2], data[3]);
}
static int debug(void)
{
int hidebank = -1;
if (keyboard_pressed(KEYCODE_Q)) hidebank = 0;
if (keyboard_pressed(KEYCODE_W)) hidebank = 1;
if (keyboard_pressed(KEYCODE_E)) hidebank = 2;
if (keyboard_pressed(KEYCODE_R)) hidebank = 3;
if (keyboard_pressed(KEYCODE_T)) hidebank = 4;
if (keyboard_pressed(KEYCODE_Y)) hidebank = 5;
if (keyboard_pressed(KEYCODE_U)) hidebank = 6;
if (keyboard_pressed(KEYCODE_I)) hidebank = 7;
if (keyboard_pressed(KEYCODE_A)) hidebank = 8;
if (keyboard_pressed(KEYCODE_S)) hidebank = 9;
if (keyboard_pressed(KEYCODE_D)) hidebank = 10;
if (keyboard_pressed(KEYCODE_F)) hidebank = 11;
if (keyboard_pressed(KEYCODE_G)) hidebank = 12;
if (keyboard_pressed(KEYCODE_H)) hidebank = 13;
if (keyboard_pressed(KEYCODE_J)) hidebank = 14;
if (keyboard_pressed(KEYCODE_K)) hidebank = 15;
if (keyboard_pressed(KEYCODE_9))
{
static int count;
char name[50];
FILE *f;
int i;
while (keyboard_pressed(KEYCODE_9)) { }
sprintf(name, "Dump %d", ++count);
f = fopen(name, "wt");
fprintf(f, "\n\nPalette RAM:\n");
for (i = 0x000; i < 0x800; i++)
{
fprintf(f, "%04X ", READ_WORD(&paletteram[i*2]));
if ((i & 15) == 15) fprintf(f, "\n");
if ((i & 255) == 255) fprintf(f, "\n");
}
fprintf(f, "\n\nMotion Objects (drawn)\n");
/* atarigen_mo_process(mo_print_callback, f);*/
fprintf(f, "\n\nMotion Objects (control = %d)\n", current_control);
for (i = 0; i < 0x100; i++)
{
fprintf(f, " Object %03X: P=%04X ?=%04X X=%04X Y=%04X S=%04X ?=%04X L=%04X ?=%04X\n",
i,
READ_WORD(&atarigen_spriteram[i*16+0]),
READ_WORD(&atarigen_spriteram[i*16+2]),
READ_WORD(&atarigen_spriteram[i*16+4]),
READ_WORD(&atarigen_spriteram[i*16+6]),
READ_WORD(&atarigen_spriteram[i*16+8]),
READ_WORD(&atarigen_spriteram[i*16+10]),
READ_WORD(&atarigen_spriteram[i*16+12]),
READ_WORD(&atarigen_spriteram[i*16+14])
);
}
fprintf(f, "\n\nPlayfield dump\n");
for (i = 0; i < atarigen_playfieldram_size / 2; i++)
{
fprintf(f, "%04X ", READ_WORD(&atarigen_playfieldram[i*2]));
if ((i & 63) == 63) fprintf(f, "\n");
}
fprintf(f, "\n\nAlpha dump\n");
for (i = 0; i < atarigen_alpharam_size / 2; i++)
{
fprintf(f, "%04X ", READ_WORD(&atarigen_alpharam[i*2]));
if ((i & 63) == 63) fprintf(f, "\n");
}
fprintf(f, "\n\nMemory dump");
for (i = 0xff0000; i < 0xffffff; i += 2)
{
if ((i & 31) == 0) fprintf(f, "\n%06X: ", i);
fprintf(f, "%04X ", READ_WORD(&atarigen_spriteram[i - 0xff0000]));
}
fclose(f);
}
return hidebank;
}
#endif