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vidhrdw
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shuuz.c
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2000-04-04
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/***************************************************************************
vidhrdw/shuuz.c
Functions to emulate the video hardware of the machine.
****************************************************************************
Playfield encoding
------------------
1 16-bit word is used
Word 1:
Bits 13-15 = palette
Bits 0-12 = image number
Motion Object encoding
----------------------
4 16-bit words are used
Word 1:
Bits 0-7 = link to the next motion object
Word 2:
Bits 0-11 = image index
Word 3:
Bits 7-15 = horizontal position
Bits 0-3 = motion object palette
Word 4:
Bits 7-15 = vertical position
Bits 4-6 = horizontal size of the object, in tiles
Bit 3 = horizontal flip
Bits 0-2 = vertical size of the object, in tiles
***************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "vidhrdw/generic.h"
#define XCHARS 42
#define YCHARS 30
#define XDIM (XCHARS*8)
#define YDIM (YCHARS*8)
#define DEBUG_VIDEO 0
/*************************************
*
* Constants
*
*************************************/
#define OVERRENDER_STANDARD 0
#define OVERRENDER_PRIORITY 1
/*************************************
*
* Structures
*
*************************************/
struct pf_overrender_data
{
struct osd_bitmap *bitmap;
int type, color;
};
/*************************************
*
* Statics
*
*************************************/
#if DEBUG_VIDEO
static UINT8 show_colors;
#endif
/*************************************
*
* 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 *data);
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void pf_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
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 void debug(void);
#endif
/*************************************
*
* Video system start
*
*************************************/
int shuuz_vh_start(void)
{
static struct atarigen_mo_desc mo_desc =
{
256, /* maximum number of MO's */
8, /* number of bytes per MO entry */
2, /* number of bytes between MO words */
0, /* ignore an entry if this word == 0xffff */
0, 0, 0xff, /* link = (data[linkword] >> linkshift) & linkmask */
0 /* render in reverse link order */
};
static struct atarigen_pf_desc pf_desc =
{
8, 8, /* width/height of each tile */
64, 64, /* number of tiles in each direction */
1 /* non-scrolling */
};
/* initialize the playfield */
if (atarigen_pf_init(&pf_desc))
return 1;
/* initialize the motion objects */
if (atarigen_mo_init(&mo_desc))
{
atarigen_pf_free();
return 1;
}
return 0;
}
/*************************************
*
* Video system shutdown
*
*************************************/
void shuuz_vh_stop(void)
{
atarigen_pf_free();
atarigen_mo_free();
}
/*************************************
*
* Playfield RAM write handler
*
*************************************/
WRITE_HANDLER( shuuz_playfieldram_w )
{
int oldword = READ_WORD(&atarigen_playfieldram[offset]);
int newword = COMBINE_WORD(oldword, data);
/* update the data if different */
if (oldword != newword)
{
WRITE_WORD(&atarigen_playfieldram[offset], newword);
atarigen_pf_dirty[(offset & 0x1fff) / 2] = 1;
}
/* handle the latch, but only write the upper byte */
if (offset < 0x2000 && atarigen_video_control_state.latch1 != -1)
shuuz_playfieldram_w(offset + 0x2000, atarigen_video_control_state.latch1 | 0x00ff0000);
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void shuuz_scanline_update(int scanline)
{
/* update the playfield */
if (scanline == 0)
atarigen_video_control_update(&atarigen_playfieldram[0x1f00]);
/* update the MOs from the SLIP table */
atarigen_mo_update_slip_512(atarigen_spriteram, atarigen_video_control_state.sprite_yscroll, scanline, &atarigen_playfieldram[0x1f80]);
}
/*************************************
*
* Main refresh
*
*************************************/
void shuuz_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
#if DEBUG_VIDEO
debug();
#endif
/* remap if necessary */
if (update_palette())
memset(atarigen_pf_dirty, 1, atarigen_playfieldram_size / 4);
/* update playfield */
atarigen_pf_process(pf_render_callback, bitmap, &Machine->drv->visible_area);
/* render the motion objects */
atarigen_mo_process(mo_render_callback, bitmap);
/* update onscreen messages */
atarigen_update_messages();
}
/*************************************
*
* Palette management
*
*************************************/
static const UINT8 *update_palette(void)
{
UINT16 mo_map[16], pf_map[16];
int i, j;
/* reset color tracking */
memset(mo_map, 0, sizeof(mo_map));
memset(pf_map, 0, sizeof(pf_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 */
atarigen_mo_process(mo_color_callback, mo_map);
/* rebuild the playfield palette */
for (i = 0; i < 16; i++)
{
UINT16 used = pf_map[i];
if (used)
for (j = 0; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x100 + i * 16 + j] = PALETTE_COLOR_USED;
}
/* rebuild the motion object palette */
for (i = 0; i < 16; i++)
{
UINT16 used = mo_map[i];
if (used)
{
palette_used_colors[0x000 + i * 16 + 0] = PALETTE_COLOR_TRANSPARENT;
for (j = 1; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x000 + i * 16 + j] = PALETTE_COLOR_USED;
}
}
/* special case color 15 of motion object palette 15 */
palette_used_colors[0x000 + 15 * 16 + 15] = PALETTE_COLOR_TRANSPARENT;
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;
UINT16 *colormap = param;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
int data1 = READ_WORD(&atarigen_playfieldram[offs * 2]);
int data2 = READ_WORD(&atarigen_playfieldram[offs * 2 + 0x2000]);
int code = data1 & 0x3fff;
int color = (data2 >> 8) & 15;
/* mark the colors used by this tile */
colormap[color] |= usage[code];
}
}
/*************************************
*
* 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];
struct osd_bitmap *bitmap = param;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
/* update only if dirty */
if (atarigen_pf_dirty[offs])
{
int data1 = READ_WORD(&atarigen_playfieldram[offs * 2]);
int data2 = READ_WORD(&atarigen_playfieldram[offs * 2 + 0x2000]);
int color = (data2 >> 8) & 15;
int hflip = data1 & 0x8000;
int code = data1 & 0x3fff;
drawgfx(atarigen_pf_bitmap, gfx, code, color, hflip, 0, 8 * x, 8 * y, 0, TRANSPARENCY_NONE, 0);
atarigen_pf_dirty[offs] = 0;
#if DEBUG_VIDEO
if (show_colors)
{
drawgfx(atarigen_pf_bitmap, Machine->uifont, "0123456789ABCDEF"[color], 1, 0, 0, 8 * x + 0, 8 * y, 0, TRANSPARENCY_PEN, 0);
drawgfx(atarigen_pf_bitmap, Machine->uifont, "0123456789ABCDEF"[color], 1, 0, 0, 8 * x + 2, 8 * y, 0, TRANSPARENCY_PEN, 0);
drawgfx(atarigen_pf_bitmap, Machine->uifont, "0123456789ABCDEF"[color], 0, 0, 0, 8 * x + 1, 8 * y, 0, TRANSPARENCY_PEN, 0);
}
#endif
}
}
/* then blast the result */
copybitmap(bitmap, atarigen_pf_bitmap, 0, 0, 0, 0, clip, TRANSPARENCY_NONE, 0);
}
/*************************************
*
* Playfield overrendering
*
*************************************/
static void pf_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const struct pf_overrender_data *overrender_data = param;
const struct GfxElement *gfx = Machine->gfx[0];
struct osd_bitmap *bitmap = overrender_data->bitmap;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
int data2 = READ_WORD(&atarigen_playfieldram[offs * 2 + 0x2000]);
int color = (data2 >> 8) & 15;
/* overdraw if the color is 15 */
if (((color & 8) && color >= overrender_data->color) || overrender_data->type == OVERRENDER_PRIORITY)
{
int data1 = READ_WORD(&atarigen_playfieldram[offs * 2]);
int hflip = data1 & 0x8000;
int code = data1 & 0x3fff;
drawgfx(bitmap, gfx, code, color, hflip, 0, 8 * x, 8 * y, clip, TRANSPARENCY_NONE, 0);
#if DEBUG_VIDEO
if (show_colors)
{
drawgfx(bitmap, Machine->uifont, "0123456789ABCDEF"[color], 1, 0, 0, 8 * x + 0, 8 * y, 0, TRANSPARENCY_PEN, 0);
drawgfx(bitmap, Machine->uifont, "0123456789ABCDEF"[color], 1, 0, 0, 8 * x + 2, 8 * y, 0, TRANSPARENCY_PEN, 0);
drawgfx(bitmap, Machine->uifont, "0123456789ABCDEF"[color], 0, 0, 0, 8 * x + 1, 8 * y, 0, TRANSPARENCY_PEN, 0);
}
#endif
}
}
}
/*************************************
*
* Motion object palette
*
*************************************/
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
const unsigned int *usage = Machine->gfx[1]->pen_usage;
UINT16 *colormap = param;
int code = data[1] & 0x7fff;
int color = data[2] & 0x000f;
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 7) + 1;
int tiles = hsize * vsize;
UINT16 temp = 0;
int i;
for (i = 0; i < tiles; i++)
temp |= usage[code++];
colormap[color] |= temp;
}
/*************************************
*
* Motion object rendering
*
*************************************/
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
const struct GfxElement *gfx = Machine->gfx[1];
struct pf_overrender_data overrender_data;
struct osd_bitmap *bitmap = param;
struct rectangle pf_clip;
/* extract data from the various words */
int hflip = data[1] & 0x8000;
int code = data[1] & 0x7fff;
int xpos = (data[2] >> 7) - atarigen_video_control_state.sprite_xscroll;
int color = data[2] & 0x000f;
int ypos = -(data[3] >> 7) - atarigen_video_control_state.sprite_yscroll;
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 7) + 1;
/* adjust for height */
ypos -= vsize * 8;
/* adjust the final coordinates */
xpos &= 0x1ff;
ypos &= 0x1ff;
if (xpos >= XDIM) xpos -= 0x200;
if (ypos >= YDIM) ypos -= 0x200;
/* determine the bounding box */
atarigen_mo_compute_clip_8x8(pf_clip, xpos, ypos, hsize, vsize, clip);
/* draw the motion object */
atarigen_mo_draw_8x8(bitmap, gfx, code, color, hflip, 0, xpos, ypos, hsize, vsize, clip, TRANSPARENCY_PEN, 0);
/* standard priority case? */
if (color != 15)
{
/* overrender the playfield */
overrender_data.bitmap = bitmap;
overrender_data.type = OVERRENDER_STANDARD;
overrender_data.color = color;
atarigen_pf_process(pf_overrender_callback, &overrender_data, &pf_clip);
}
/* high priority case? */
else
{
/* overrender the playfield */
overrender_data.bitmap = atarigen_pf_overrender_bitmap;
overrender_data.type = OVERRENDER_PRIORITY;
overrender_data.color = color;
atarigen_pf_process(pf_overrender_callback, &overrender_data, &pf_clip);
/* finally, copy this chunk to the real bitmap */
copybitmap(bitmap, atarigen_pf_overrender_bitmap, 0, 0, 0, 0, &pf_clip, TRANSPARENCY_THROUGH, palette_transparent_pen);
}
#if DEBUG_VIDEO
if (show_colors)
{
int tx = (pf_clip.min_x + pf_clip.max_x) / 2 - 3;
int ty = (pf_clip.min_y + pf_clip.max_y) / 2 - 4;
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx - 2, ty - 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx + 2, ty - 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx - 2, ty + 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx + 2, ty + 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, "0123456789ABCDEF"[color], 0, 0, 0, tx, ty, 0, TRANSPARENCY_NONE, 0);
}
#endif
}
/*************************************
*
* Debugging
*
*************************************/
#if DEBUG_VIDEO
static void mo_print_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
FILE *file = param;
/* extract data from the various words */
int hflip = data[1] & 0x8000;
int code = data[1] & 0x7fff;
int xpos = (data[2] >> 7) - 5;
int color = data[2] & 0x000f;
int ypos = YDIM - (data[3] >> 7);
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 7) + 1;
fprintf(file, "P=%04X C=%X F=%X X=%03X Y=%03X S=%dx%d\n", code, color, hflip >> 15, xpos & 0xfff, ypos & 0xfff, hsize, vsize);
}
static void debug(void)
{
int new_show_colors;
int new_special;
new_show_colors = keyboard_pressed(KEYCODE_CAPSLOCK);
if (new_show_colors != show_colors)
{
show_colors = new_show_colors;
memset(atarigen_pf_dirty, 0xff, atarigen_playfieldram_size / 4);
}
if (keyboard_pressed(KEYCODE_Q)) new_special = 0;
if (keyboard_pressed(KEYCODE_W)) new_special = 1;
if (keyboard_pressed(KEYCODE_E)) new_special = 2;
if (keyboard_pressed(KEYCODE_R)) new_special = 3;
if (keyboard_pressed(KEYCODE_T)) new_special = 4;
if (keyboard_pressed(KEYCODE_Y)) new_special = 5;
if (keyboard_pressed(KEYCODE_U)) new_special = 6;
if (keyboard_pressed(KEYCODE_I)) new_special = 7;
if (keyboard_pressed(KEYCODE_A)) new_special = 8;
if (keyboard_pressed(KEYCODE_S)) new_special = 9;
if (keyboard_pressed(KEYCODE_D)) new_special = 10;
if (keyboard_pressed(KEYCODE_F)) new_special = 11;
if (keyboard_pressed(KEYCODE_G)) new_special = 12;
if (keyboard_pressed(KEYCODE_H)) new_special = 13;
if (keyboard_pressed(KEYCODE_J)) new_special = 14;
if (keyboard_pressed(KEYCODE_K)) new_special = 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\nMotion Object Palette:\n");
for (i = 0x000; i < 0x100; i++)
{
fprintf(f, "%04X ", READ_WORD(&paletteram[i*2]));
if ((i & 15) == 15) fprintf(f, "\n");
}
fprintf(f, "\n\nPlayfield Palette:\n");
for (i = 0x100; i < 0x200; i++)
{
fprintf(f, "%04X ", READ_WORD(&paletteram[i*2]));
if ((i & 15) == 15) fprintf(f, "\n");
}
fprintf(f, "\n\nMotion Objects Drawn:\n");
atarigen_mo_process(mo_print_callback, f);
fprintf(f, "\n\nMotion Objects\n");
for (i = 0; i < 256; i++)
{
UINT16 *data = (UINT16 *)&atarigen_spriteram[i*8];
int hflip = data[1] & 0x8000;
int code = data[1] & 0x7fff;
int xpos = (data[2] >> 7) - 5;
int ypos = YDIM - (data[3] >> 7);
int color = data[2] & 0x000f;
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 7) + 1;
fprintf(f, " Object %03X: L=%03X P=%04X C=%X X=%03X Y=%03X W=%d H=%d F=%d LEFT=(%04X %04X %04X %04X)\n",
i, data[0] & 0x3ff, code, color, xpos & 0x1ff, ypos & 0x1ff, hsize, vsize, hflip,
data[0] & 0xfc00, data[1] & 0x0000, data[2] & 0x0070, data[3] & 0x0008);
}
fprintf(f, "\n\nPlayfield dump\n");
for (i = 0; i < atarigen_playfieldram_size / 4; i++)
{
fprintf(f, "%X%04X ", READ_WORD(&atarigen_playfieldram[0x2000 + i*2]) >> 8, READ_WORD(&atarigen_playfieldram[i*2]));
if ((i & 63) == 63) fprintf(f, "\n");
}
fprintf(f, "\n\nSprite RAM dump\n");
for (i = 0; i < 0x3000 / 2; i++)
{
fprintf(f, "%04X ", READ_WORD(&atarigen_spriteram[i*2]));
if ((i & 31) == 31) fprintf(f, "\n");
}
fclose(f);
}
}
#endif