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-rw-r--r--src/mame/video/thunderj.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/src/mame/video/thunderj.c b/src/mame/video/thunderj.c
new file mode 100644
index 00000000000..baf3d46875c
--- /dev/null
+++ b/src/mame/video/thunderj.c
@@ -0,0 +1,296 @@
+/***************************************************************************
+
+ Atari ThunderJaws hardware
+
+****************************************************************************/
+
+#include "driver.h"
+#include "machine/atarigen.h"
+#include "includes/thunderj.h"
+
+
+
+/*************************************
+ *
+ * Globals
+ *
+ *************************************/
+
+UINT8 thunderj_alpha_tile_bank;
+
+
+
+/*************************************
+ *
+ * Tilemap callbacks
+ *
+ *************************************/
+
+static TILE_GET_INFO( get_alpha_tile_info )
+{
+ UINT16 data = atarigen_alpha[tile_index];
+ int code = ((data & 0x200) ? (thunderj_alpha_tile_bank * 0x200) : 0) + (data & 0x1ff);
+ int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20);
+ int opaque = data & 0x8000;
+ SET_TILE_INFO(2, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
+}
+
+
+static TILE_GET_INFO( get_playfield_tile_info )
+{
+ UINT16 data1 = atarigen_playfield[tile_index];
+ UINT16 data2 = atarigen_playfield_upper[tile_index] & 0xff;
+ int code = data1 & 0x7fff;
+ int color = 0x10 + (data2 & 0x0f);
+ SET_TILE_INFO(0, code, color, (data1 >> 15) & 1);
+ tileinfo->category = (data2 >> 4) & 3;
+}
+
+
+static TILE_GET_INFO( get_playfield2_tile_info )
+{
+ UINT16 data1 = atarigen_playfield2[tile_index];
+ UINT16 data2 = atarigen_playfield_upper[tile_index] >> 8;
+ int code = data1 & 0x7fff;
+ int color = data2 & 0x0f;
+ SET_TILE_INFO(0, code, color, (data1 >> 15) & 1);
+ tileinfo->category = (data2 >> 4) & 3;
+}
+
+
+
+/*************************************
+ *
+ * Video system start
+ *
+ *************************************/
+
+VIDEO_START( thunderj )
+{
+ static const struct atarimo_desc modesc =
+ {
+ 1, /* index to which gfx system */
+ 1, /* number of motion object banks */
+ 1, /* are the entries linked? */
+ 0, /* are the entries split? */
+ 1, /* render in reverse order? */
+ 0, /* render in swapped X/Y order? */
+ 0, /* does the neighbor bit affect the next object? */
+ 8, /* pixels per SLIP entry (0 for no-slip) */
+ 0, /* pixel offset for SLIPs */
+ 0, /* maximum number of links to visit/scanline (0=all) */
+
+ 0x100, /* base palette entry */
+ 0x100, /* maximum number of colors */
+ 0, /* transparent pen index */
+
+ {{ 0x03ff,0,0,0 }}, /* mask for the link */
+ {{ 0 }}, /* mask for the graphics bank */
+ {{ 0,0x7fff,0,0 }}, /* mask for the code index */
+ {{ 0 }}, /* mask for the upper code index */
+ {{ 0,0,0x000f,0 }}, /* mask for the color */
+ {{ 0,0,0xff80,0 }}, /* mask for the X position */
+ {{ 0,0,0,0xff80 }}, /* mask for the Y position */
+ {{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/
+ {{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */
+ {{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */
+ {{ 0 }}, /* mask for the vertical flip */
+ {{ 0,0,0x0070,0 }}, /* mask for the priority */
+ {{ 0 }}, /* mask for the neighbor */
+ {{ 0 }}, /* mask for absolute coordinates */
+
+ {{ 0 }}, /* mask for the special value */
+ 0, /* resulting value to indicate "special" */
+ NULL /* callback routine for special entries */
+ };
+
+ /* initialize the playfield */
+ atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_cols, TILEMAP_TYPE_PEN, 8,8, 64,64);
+
+ /* initialize the second playfield */
+ atarigen_playfield2_tilemap = tilemap_create(get_playfield2_tile_info, tilemap_scan_cols, TILEMAP_TYPE_PEN, 8,8, 64,64);
+ tilemap_set_transparent_pen(atarigen_playfield2_tilemap, 0);
+
+ /* initialize the motion objects */
+ atarimo_init(machine, 0, &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);
+}
+
+
+
+/*************************************
+ *
+ * Mark high palette bits starting
+ * at the given X,Y and continuing
+ * until a stop or the end of line
+ *
+ *************************************/
+
+void thunderj_mark_high_palette(mame_bitmap *bitmap, UINT16 *pf, UINT16 *mo, int x, int y)
+{
+ #define START_MARKER ((4 << ATARIMO_PRIORITY_SHIFT) | 2)
+ #define END_MARKER ((4 << ATARIMO_PRIORITY_SHIFT) | 4)
+ int offnext = 0;
+
+ for ( ; x < bitmap->width; x++)
+ {
+ pf[x] |= 0x400;
+ if (offnext && (mo[x] & START_MARKER) != START_MARKER)
+ break;
+ offnext = ((mo[x] & END_MARKER) == END_MARKER);
+ }
+ }
+
+
+
+/*************************************
+ *
+ * Main refresh
+ *
+ *************************************/
+
+VIDEO_UPDATE( thunderj )
+{
+ struct atarimo_rect_list rectlist;
+ mame_bitmap *mobitmap;
+ int x, y, r;
+
+ /* draw the playfield */
+ fillbitmap(priority_bitmap, 0, cliprect);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0x00);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 1, 0x01);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 2, 0x02);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 3, 0x03);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 0, 0x80);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 1, 0x84);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 2, 0x88);
+ tilemap_draw(bitmap, cliprect, atarigen_playfield2_tilemap, 3, 0x8c);
+
+ /* draw and merge the MO */
+ mobitmap = atarimo_render(machine, 0, cliprect, &rectlist);
+ for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
+ for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
+ {
+ UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
+ UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y;
+ UINT8 *pri = (UINT8 *)priority_bitmap->base + priority_bitmap->rowpixels * y;
+ for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
+ if (mo[x])
+ {
+ /* verified from the GALs on the real PCB; equations follow
+ *
+ * --- PF/M is 1 if playfield has priority, or 0 if MOs have priority
+ * PF/M=MPX0*!MPX1*!MPX2*!MPX3*!MPX4*!MPX5*!MPX6*!MPX7
+ * +PFX3*PFX8*PFX9*!MPR0
+ * +PFX3*PFX8*!MPR0*!MPR1
+ * +PFX3*PFX9*!MPR1
+ *
+ * --- CS1 is 1 if the playfield should be displayed
+ * CS1=PF/M*!ALBG*!APIX0*!APIX1
+ * +!MPX0*!MPX1*!MPX2*!MPX3*!ALBG*!APIX0*!APIX1
+ *
+ * --- CS0 is 1 if the MOs should be displayed
+ * CS0=!PF/M*MPX0*!ALBG*!APIX0*!APIX1
+ * +!PF/M*MPX1*!ALBG*!APIX0*!APIX1
+ * +!PF/M*MPX2*!ALBG*!APIX0*!APIX1
+ * +!PF/M*MPX3*!ALBG*!APIX0*!APIX1
+ *
+ * --- CRA10 is the 0x200 bit of the color RAM index; set if pf is displayed
+ * CRA10:=CS1
+ *
+ * --- CRA9 is the 0x100 bit of the color RAM index; set if mo is displayed
+ * or if the playfield selected is playfield #2
+ * CRA9:=PFXS*CS1
+ * +!CS1*CS0
+ *
+ * --- CRA8-1 are the low 8 bits of the color RAM index; set as expected
+ * CRA8:=CS1*PFX7
+ * +!CS1*MPX7*CS0
+ * +!CS1*!CS0*ALC4
+ *
+ * CRA7:=CS1*PFX6
+ * +!CS1*MPX6*CS0
+ *
+ * CRA6:=CS1*PFX5
+ * +MPX5*!CS1*CS0
+ * +!CS1*!CS0*ALC3
+ *
+ * CRA5:=CS1*PFX4
+ * +MPX4*!CS1*CS0
+ * +!CS1*ALC2*!CS0
+ *
+ * CRA4:=CS1*PFX3
+ * +!CS1*MPX3*CS0
+ * +!CS1*!CS0*ALC1
+ *
+ * CRA3:=CS1*PFX2
+ * +MPX2*!CS1*CS0
+ * +!CS1*!CS0*ALC0
+ *
+ * CRA2:=CS1*PFX1
+ * +MPX1*!CS1*CS0
+ * +!CS1*!CS0*APIX1
+ *
+ * CRA1:=CS1*PFX0
+ * +MPX0*!CS1*CS0
+ * +!CS1*!CS0*APIX0
+ */
+ int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT;
+ int pfm = 0;
+
+ /* upper bit of MO priority signals special rendering and doesn't draw anything */
+ if (mopriority & 4)
+ continue;
+
+ /* determine pf/m signal */
+ if ((mo[x] & 0xff) == 1)
+ pfm = 1;
+ else if (pf[x] & 8)
+ {
+ int pfpriority = (pri[x] & 0x80) ? ((pri[x] >> 2) & 3) : (pri[x] & 3);
+ if (((pfpriority == 3) && !(mopriority & 1)) ||
+ ((pfpriority & 1) && (mopriority == 0)) ||
+ ((pfpriority & 2) && !(mopriority & 2)))
+ pfm = 1;
+ }
+
+ /* if pfm is low, we display the mo */
+ if (!pfm)
+ pf[x] = mo[x] & ATARIMO_DATA_MASK;
+
+ /* don't erase yet -- we need to make another pass later */
+ }
+ }
+
+ /* add the alpha on top */
+ tilemap_draw(bitmap, cliprect, atarigen_alpha_tilemap, 0, 0);
+
+ /* now go back and process the upper bit of MO priority */
+ rectlist.rect -= rectlist.numrects;
+ for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
+ for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
+ {
+ UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
+ UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y;
+ for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
+ if (mo[x])
+ {
+ int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT;
+
+ /* upper bit of MO priority might mean palette kludges */
+ if (mopriority & 4)
+ {
+ /* if bit 2 is set, start setting high palette bits */
+ if (mo[x] & 2)
+ thunderj_mark_high_palette(bitmap, pf, mo, x, y);
+ }
+
+ /* erase behind ourselves */
+ mo[x] = 0;
+ }
+ }
+ return 0;
+}