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-rw-r--r--src/mame/video/atarigx2.c259
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diff --git a/src/mame/video/atarigx2.c b/src/mame/video/atarigx2.c
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+++ b/src/mame/video/atarigx2.c
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+/***************************************************************************
+
+ Atari GX2 hardware
+
+*****************************************************************************
+
+ MO data has 12 bits total: MVID0-11
+ MVID9-11 form the priority
+ MVID0-9 form the color bits
+
+ PF data has 13 bits total: PF.VID0-12
+ PF.VID10-12 form the priority
+ PF.VID0-9 form the color bits
+
+ Upper bits come from the low 5 bits of the HSCROLL value in alpha RAM
+ Playfield bank comes from low 2 bits of the VSCROLL value in alpha RAM
+ For GX2, there are 4 bits of bank
+
+****************************************************************************/
+
+
+#include "driver.h"
+#include "machine/atarigen.h"
+#include "atarigx2.h"
+
+
+
+/*************************************
+ *
+ * Globals we own
+ *
+ *************************************/
+
+UINT16 atarigx2_playfield_base;
+UINT16 atarigx2_motion_object_base;
+UINT16 atarigx2_motion_object_mask;
+
+
+
+/*************************************
+ *
+ * Statics
+ *
+ *************************************/
+
+static UINT16 current_control;
+static UINT8 playfield_tile_bank;
+static UINT8 playfield_color_bank;
+static UINT16 playfield_xscroll;
+static UINT16 playfield_yscroll;
+
+
+
+/*************************************
+ *
+ * Tilemap callbacks
+ *
+ *************************************/
+
+static TILE_GET_INFO( get_alpha_tile_info )
+{
+ UINT16 data = atarigen_alpha32[tile_index / 2] >> (16 * (~tile_index & 1));
+ int code = data & 0xfff;
+ int color = (data >> 12) & 0x0f;
+ int opaque = data & 0x8000;
+ SET_TILE_INFO(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
+}
+
+
+static TILE_GET_INFO( get_playfield_tile_info )
+{
+ UINT16 data = atarigen_playfield32[tile_index / 2] >> (16 * (~tile_index & 1));
+ int code = (playfield_tile_bank << 12) | (data & 0xfff);
+ int color = (atarigx2_playfield_base >> 5) + ((playfield_color_bank << 3) & 0x18) + ((data >> 12) & 7);
+ SET_TILE_INFO(0, code, color, (data >> 15) & 1);
+ tileinfo->category = (playfield_color_bank >> 2) & 7;
+}
+
+
+static TILEMAP_MAPPER( atarigx2_playfield_scan )
+{
+ int bank = 1 - (col / (num_cols / 2));
+ return bank * (num_rows * num_cols / 2) + row * (num_cols / 2) + (col % (num_cols / 2));
+}
+
+
+
+/*************************************
+ *
+ * Video system start
+ *
+ *************************************/
+
+VIDEO_START( atarigx2 )
+{
+ static const struct atarirle_desc modesc =
+ {
+ REGION_GFX3,/* region where the GFX data lives */
+ 256, /* number of entries in sprite RAM */
+ 0, /* left clip coordinate */
+ 0, /* right clip coordinate */
+
+ 0x000, /* base palette entry */
+ 0x400, /* maximum number of colors */
+
+ {{ 0x7fff,0,0,0,0,0,0,0 }}, /* mask for the code index */
+ {{ 0,0x03f0,0,0,0,0,0,0 }}, /* mask for the color */
+ {{ 0,0,0xffc0,0,0,0,0,0 }}, /* mask for the X position */
+ {{ 0,0,0,0xffc0,0,0,0,0 }}, /* mask for the Y position */
+ {{ 0,0,0,0,0xffff,0,0,0 }}, /* mask for the scale factor */
+ {{ 0x8000,0,0,0,0,0,0,0 }}, /* mask for the horizontal flip */
+ {{ 0,0,0,0,0,0,0x00ff,0 }}, /* mask for the order */
+ {{ 0,0x0e00,0,0,0,0,0,0 }}, /* mask for the priority */
+ {{ 0 }} /* mask for the VRAM target */
+ };
+ struct atarirle_desc adjusted_modesc = modesc;
+ int i;
+
+ /* blend the playfields and free the temporary one */
+ atarigen_blend_gfx(machine, 0, 2, 0x0f, 0x30);
+
+ /* initialize the playfield */
+ atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, atarigx2_playfield_scan, TILEMAP_TYPE_PEN, 8,8, 128,64);
+
+ /* initialize the motion objects */
+ adjusted_modesc.palettebase = atarigx2_motion_object_base;
+ for (i = 0; i < 8; i++)
+ adjusted_modesc.colormask.data[i] &= atarigx2_motion_object_mask;
+ atarirle_init(0, &adjusted_modesc);
+
+ /* initialize the alphanumerics */
+ atarigen_alpha_tilemap = tilemap_create(get_alpha_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 64,32);
+ tilemap_set_transparent_pen(atarigen_alpha_tilemap, 0);
+
+ /* reset statics */
+ current_control = 0;
+ playfield_tile_bank = 0;
+ playfield_color_bank = 0;
+ playfield_xscroll = 0;
+ playfield_yscroll = 0;
+}
+
+
+
+/*************************************
+ *
+ * Periodic scanline updater
+ *
+ *************************************/
+
+WRITE16_HANDLER( atarigx2_mo_control_w )
+{
+ logerror("MOCONT = %d (scan = %d)\n", data, video_screen_get_vpos(0));
+
+ /* set the control value */
+ COMBINE_DATA(&current_control);
+}
+
+
+void atarigx2_scanline_update(running_machine *machine, int scrnum, int scanline)
+{
+ UINT32 *base = &atarigen_alpha32[(scanline / 8) * 32 + 24];
+ int i;
+
+ if (scanline == 0) logerror("-------\n");
+
+ /* keep in range */
+ if (base >= &atarigen_alpha32[0x400])
+ return;
+
+ /* update the playfield scrolls */
+ for (i = 0; i < 8; i++)
+ {
+ UINT32 word = *base++;
+
+ if (word & 0x80000000)
+ {
+ int newscroll = (word >> 21) & 0x3ff;
+ int newbank = (word >> 16) & 0x1f;
+ if (newscroll != playfield_xscroll)
+ {
+ video_screen_update_partial(0, scanline + i - 1);
+ tilemap_set_scrollx(atarigen_playfield_tilemap, 0, newscroll);
+ playfield_xscroll = newscroll;
+ }
+ if (newbank != playfield_color_bank)
+ {
+ video_screen_update_partial(0, scanline + i - 1);
+ tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
+ playfield_color_bank = newbank;
+ }
+ }
+
+ if (word & 0x00008000)
+ {
+ int newscroll = ((word >> 6) - (scanline + i)) & 0x1ff;
+ int newbank = word & 15;
+ if (newscroll != playfield_yscroll)
+ {
+ video_screen_update_partial(0, scanline + i - 1);
+ tilemap_set_scrolly(atarigen_playfield_tilemap, 0, newscroll);
+ playfield_yscroll = newscroll;
+ }
+ if (newbank != playfield_tile_bank)
+ {
+ video_screen_update_partial(0, scanline + i - 1);
+ tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
+ playfield_tile_bank = newbank;
+ }
+ }
+ }
+}
+
+
+
+/*************************************
+ *
+ * Main refresh
+ *
+ *************************************/
+
+VIDEO_UPDATE( atarigx2 )
+{
+ /* draw the playfield */
+ fillbitmap(priority_bitmap, 0, cliprect);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 1, 1);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 2, 2);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 3, 3);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 4, 4);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 5, 5);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 6, 6);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 7, 7);
+
+ /* copy the motion objects on top */
+ {
+ mame_bitmap *mo_bitmap = atarirle_get_vram(0, 0);
+ int left = cliprect->min_x;
+ int top = cliprect->min_y;
+ int right = cliprect->max_x + 1;
+ int bottom = cliprect->max_y + 1;
+ int x, y;
+
+ /* now blend with the playfield */
+ for (y = top; y < bottom; y++)
+ {
+ UINT16 *pf = (UINT16 *)bitmap->base + y * bitmap->rowpixels;
+ UINT16 *mo = (UINT16 *)mo_bitmap->base + y * mo_bitmap->rowpixels;
+ UINT8 *pri = (UINT8 *)priority_bitmap->base + y * priority_bitmap->rowpixels;
+ for (x = left; x < right; x++)
+ if (mo[x] && (mo[x] >> ATARIRLE_PRIORITY_SHIFT) >= pri[x])
+ pf[x] = mo[x] & ATARIRLE_DATA_MASK;
+ }
+ }
+
+ /* add the alpha on top */
+ tilemap_draw(bitmap, cliprect, atarigen_alpha_tilemap, 0, 0);
+ return 0;
+}