diff options
Diffstat (limited to 'src/mame/video/dcheese.cpp')
-rw-r--r-- | src/mame/video/dcheese.cpp | 307 |
1 files changed, 0 insertions, 307 deletions
diff --git a/src/mame/video/dcheese.cpp b/src/mame/video/dcheese.cpp deleted file mode 100644 index 17fc90b3993..00000000000 --- a/src/mame/video/dcheese.cpp +++ /dev/null @@ -1,307 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Aaron Giles -/*************************************************************************** - - HAR MadMax hardware - -**************************************************************************/ - - -#include "emu.h" -#include "includes/dcheese.h" - - -/************************************* - * - * Constants - * - *************************************/ - -static constexpr u32 DSTBITMAP_WIDTH = 512; -static constexpr u32 DSTBITMAP_HEIGHT = 512; - - -/************************************* - * - * Palette translation - * - *************************************/ - -void dcheese_state::dcheese_palette(palette_device &palette) const -{ - for (int i = 0; i < 65536; i++) - { - u16 const data = m_palrom[i]; - palette.set_pen_color(i, pal6bit(data >> 0), pal5bit(data >> 6), pal5bit(data >> 11)); - } -} - - - -/************************************* - * - * Scanline interrupt - * - *************************************/ - -void dcheese_state::update_scanline_irq() -{ - /* if not in range, don't bother */ - if (m_blitter_vidparam[0x22/2] <= m_blitter_vidparam[0x1e/2]) - { - /* compute the effective scanline of the interrupt */ - int effscan = m_blitter_vidparam[0x22/2] - m_blitter_vidparam[0x1a/2]; - if (effscan < 0) - effscan += m_blitter_vidparam[0x1e/2]; - - /* determine the time; if it's in this scanline, bump to the next frame */ - attotime time = m_screen->time_until_pos(effscan); - if (time < m_screen->scan_period()) - time += m_screen->frame_period(); - m_blitter_timer->adjust(time); - } -} - - -void dcheese_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) -{ - switch (id) - { - case TIMER_BLITTER_SCANLINE: - signal_irq(3); - update_scanline_irq(); - break; - case TIMER_SIGNAL_IRQ: - signal_irq(param); - break; - default: - throw emu_fatalerror("Unknown id in dcheese_state::device_timer"); - } -} - - -/************************************* - * - * Video start - * - *************************************/ - -void dcheese_state::video_start() -{ - /* the destination bitmap is not directly accessible to the CPU */ - m_dstbitmap = std::make_unique<bitmap_ind16>(DSTBITMAP_WIDTH, DSTBITMAP_HEIGHT); - - /* create timers */ - m_blitter_timer = timer_alloc(TIMER_BLITTER_SCANLINE); - m_signal_irq_timer = timer_alloc(TIMER_SIGNAL_IRQ); - - /* register for saving */ - save_item(NAME(m_blitter_color)); - save_item(NAME(m_blitter_xparam)); - save_item(NAME(m_blitter_yparam)); - save_item(NAME(m_blitter_vidparam)); - save_item(NAME(*m_dstbitmap)); -} - - - -/************************************* - * - * Video update - * - *************************************/ - -u32 dcheese_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) -{ - /* update the pixels */ - for (int y = cliprect.min_y; y <= cliprect.max_y; y++) - { - u16 *dest = &bitmap.pix16(y); - u16 *src = &m_dstbitmap->pix16((y + m_blitter_vidparam[0x28/2]) & 0x1ff); - - for (int x = cliprect.min_x; x <= cliprect.max_x; x++) - dest[x] = src[x]; - } - return 0; -} - - - -/************************************* - * - * Blitter implementation - * - *************************************/ - -void dcheese_state::do_clear() -{ - /* clear the requested scanlines */ - for (int y = m_blitter_vidparam[0x2c/2]; y < m_blitter_vidparam[0x2a/2]; y++) - memset(&m_dstbitmap->pix16(y & 0x1ff), 0, DSTBITMAP_WIDTH * 2); - - /* signal an IRQ when done (timing is just a guess) */ - m_signal_irq_timer->adjust(m_screen->scan_period(), 1); -} - - -void dcheese_state::do_blit() -{ - s32 const srcminx = m_blitter_xparam[0] << 12; - s32 const srcmaxx = m_blitter_xparam[1] << 12; - s32 const srcminy = m_blitter_yparam[0] << 12; - s32 const srcmaxy = m_blitter_yparam[1] << 12; - s32 const srcx = ((m_blitter_xparam[2] & 0x0fff) | ((m_blitter_xparam[3] & 0x0fff) << 12)) << 7; - s32 const srcy = ((m_blitter_yparam[2] & 0x0fff) | ((m_blitter_yparam[3] & 0x0fff) << 12)) << 7; - s32 const dxdx = (s32)(((m_blitter_xparam[4] & 0x0fff) | ((m_blitter_xparam[5] & 0x0fff) << 12)) << 12) >> 12; - s32 const dxdy = (s32)(((m_blitter_xparam[6] & 0x0fff) | ((m_blitter_xparam[7] & 0x0fff) << 12)) << 12) >> 12; - s32 const dydx = (s32)(((m_blitter_yparam[4] & 0x0fff) | ((m_blitter_yparam[5] & 0x0fff) << 12)) << 12) >> 12; - s32 const dydy = (s32)(((m_blitter_yparam[6] & 0x0fff) | ((m_blitter_yparam[7] & 0x0fff) << 12)) << 12) >> 12; - u32 const pagemask = m_gfxrom.mask() >> 18; - int const xstart = m_blitter_xparam[14]; - int const xend = m_blitter_xparam[15] + 1; - int const ystart = m_blitter_yparam[14]; - int const yend = m_blitter_yparam[15]; - u32 const color = (m_blitter_color[0] << 8) & 0xff00; - u8 const mask = (m_blitter_color[0] >> 8) & 0x00ff; - bool const opaque = (dxdx | dxdy | dydx | dydy) == 0; /* bit of a hack for fredmem */ - - /* loop over target rows */ - for (int y = ystart; y <= yend; y++) - { - u16 *dst = &m_dstbitmap->pix16(y & 0x1ff); - - /* loop over target columns */ - for (int x = xstart; x <= xend; x++) - { - /* compute current X/Y positions */ - int const sx = (srcx + dxdx * (x - xstart) + dxdy * (y - ystart)) & 0xffffff; - int const sy = (srcy + dydx * (x - xstart) + dydy * (y - ystart)) & 0xffffff; - - /* clip to source cliprect */ - if (sx >= srcminx && sx <= srcmaxx && sy >= srcminy && sy <= srcmaxy) - { - /* page comes from bit 22 of Y and bit 21 of X */ - u32 const page = (((sy >> 21) & 2) | ((sx >> 21) & 1) | ((sx >> 20) & 4)) & pagemask; - u8 const pix = m_gfxrom[(page << 18) | (((sy >> 12) & 0x1ff) << 9) | ((sx >> 12) & 0x1ff)]; - - /* only non-zero pixels get written */ - if (pix | opaque) - dst[x & 0x1ff] = (pix & mask) | color; - } - } - } - - /* signal an IRQ when done (timing is just a guess) */ - m_signal_irq_timer->adjust(m_screen->scan_period() / 2, 2); - - /* these extra parameters are written but they are always zero, so I don't know what they do */ - if (m_blitter_xparam[8] != 0 || m_blitter_xparam[9] != 0 || m_blitter_xparam[10] != 0 || m_blitter_xparam[11] != 0 || - m_blitter_yparam[8] != 0 || m_blitter_yparam[9] != 0 || m_blitter_yparam[10] != 0 || m_blitter_yparam[11] != 0) - { - logerror("%s:blit! (%04X)\n", machine().describe_context(), m_blitter_color[0]); - logerror(" %04X %04X %04X %04X - %04X %04X %04X %04X - %04X %04X %04X %04X - %04X %04X %04X %04X\n", - m_blitter_xparam[0], m_blitter_xparam[1], m_blitter_xparam[2], m_blitter_xparam[3], - m_blitter_xparam[4], m_blitter_xparam[5], m_blitter_xparam[6], m_blitter_xparam[7], - m_blitter_xparam[8], m_blitter_xparam[9], m_blitter_xparam[10], m_blitter_xparam[11], - m_blitter_xparam[12], m_blitter_xparam[13], m_blitter_xparam[14], m_blitter_xparam[15]); - logerror(" %04X %04X %04X %04X - %04X %04X %04X %04X - %04X %04X %04X %04X - %04X %04X %04X %04X\n", - m_blitter_yparam[0], m_blitter_yparam[1], m_blitter_yparam[2], m_blitter_yparam[3], - m_blitter_yparam[4], m_blitter_yparam[5], m_blitter_yparam[6], m_blitter_yparam[7], - m_blitter_yparam[8], m_blitter_yparam[9], m_blitter_yparam[10], m_blitter_yparam[11], - m_blitter_yparam[12], m_blitter_yparam[13], m_blitter_yparam[14], m_blitter_yparam[15]); - } -} - - - -/************************************* - * - * Blitter read/write - * - *************************************/ - -WRITE16_MEMBER(dcheese_state::blitter_color_w) -{ - COMBINE_DATA(&m_blitter_color[offset]); -} - - -WRITE16_MEMBER(dcheese_state::blitter_xparam_w) -{ - COMBINE_DATA(&m_blitter_xparam[offset]); -} - - -WRITE16_MEMBER(dcheese_state::blitter_yparam_w) -{ - COMBINE_DATA(&m_blitter_yparam[offset]); -} - - -WRITE16_MEMBER(dcheese_state::blitter_vidparam_w) -{ - COMBINE_DATA(&m_blitter_vidparam[offset]); - - switch (offset) - { - case 0x10/2: /* horiz front porch */ - case 0x12/2: /* horiz display start */ - case 0x14/2: /* horiz display end */ - case 0x16/2: /* horiz back porch */ - - case 0x18/2: /* vert front porch */ - case 0x1a/2: /* vert display start */ - case 0x1c/2: /* vert display end */ - case 0x1e/2: /* vert back porch */ - break; - - case 0x22/2: /* scanline interrupt */ - update_scanline_irq(); - break; - - case 0x24/2: /* writes here after writing to 0x28 */ - break; - - case 0x28/2: /* display starting y */ - case 0x2a/2: /* clear end y */ - case 0x2c/2: /* clear start y */ - break; - - case 0x38/2: /* blit */ - do_blit(); - break; - - case 0x3e/2: /* clear */ - do_clear(); - break; - - default: - logerror("%06X:write to %06X = %04X & %04x\n", m_maincpu->pc(), 0x2a0000 + 2 * offset, data, mem_mask); - break; - } -} - - -WRITE16_MEMBER(dcheese_state::blitter_unknown_w) -{ - /* written to just before the blitter command register is written */ - logerror("%06X:write to %06X = %04X & %04X\n", m_maincpu->pc(), 0x300000 + 2 * offset, data, mem_mask); -} - - -READ16_MEMBER(dcheese_state::blitter_vidparam_r) -{ - /* analog inputs seem to be hooked up here -- might not actually map to blitter */ - if (offset == 0x02/2) - return m_2a0002_io->read(); - if (offset == 0x0e/2) - return m_2a000e_io->read(); - - /* early code polls on this bit, wants it to be 0 */ - if (offset == 0x36/2) - return 0xffff ^ (1 << 5); - - /* log everything else */ - logerror("%06X:read from %06X\n", m_maincpu->pc(), 0x2a0000 + 2 * offset); - return 0xffff; -} |