mirror of
https://github.com/holub/mame
synced 2025-06-02 10:59:52 +03:00
ea79b463b9
Simplify handlers, Remove hardcoded tags, Unnecessary pointer, Reduce unnecessary lines, Fix debugger issues, Use shorter / correct type values
106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Aaron Giles
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/***************************************************************************
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Sega X-board hardware
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***************************************************************************/
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#include "emu.h"
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#include "includes/segaxbd.h"
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//**************************************************************************
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// VIDEO STARTUP
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//**************************************************************************
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void segaxbd_state::video_start()
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{
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if(!m_segaic16vid->started())
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throw device_missing_dependencies();
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if(!m_segaic16road->started())
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throw device_missing_dependencies();
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// initialize the tile/text layers
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m_segaic16vid->tilemap_init( 0, segaic16_video_device::TILEMAP_16B, 0x1c00, 0, 2);
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// initialize the road
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m_segaic16road->segaic16_road_init(0, segaic16_road_device::ROAD_XBOARD, 0x1700, 0x1720, 0x1780, -166);
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}
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//**************************************************************************
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// VIDEO UPDATE
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//**************************************************************************
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uint32_t segaxbd_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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// if no drawing is happening, fill with black and get out
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if (!m_segaic16vid->m_display_enable)
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{
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bitmap.fill(m_palette->black_pen(), cliprect);
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return 0;
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}
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// start the sprites drawing
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m_sprites->draw_async(cliprect);
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// reset priorities
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screen.priority().fill(0, cliprect);
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// draw the low priority road layer
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m_segaic16road->segaic16_road_draw(0, bitmap, cliprect, segaic16_road_device::ROAD_BACKGROUND);
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if (m_road_priority == 0)
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m_segaic16road->segaic16_road_draw(0, bitmap, cliprect, segaic16_road_device::ROAD_FOREGROUND);
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// draw background
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m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 0, 0x01);
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m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_BACKGROUND, 1, 0x02);
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// draw foreground
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m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_FOREGROUND, 0, 0x02);
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m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_FOREGROUND, 1, 0x04);
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// draw the high priority road
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if (m_road_priority == 1)
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m_segaic16road->segaic16_road_draw(0, bitmap, cliprect, segaic16_road_device::ROAD_FOREGROUND);
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// text layer
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m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_TEXT, 0, 0x04);
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m_segaic16vid->tilemap_draw( screen, bitmap, cliprect, 0, segaic16_video_device::TILEMAP_TEXT, 1, 0x08);
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// mix in sprites
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bitmap_ind16 &sprites = m_sprites->bitmap();
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for (const sparse_dirty_rect *rect = m_sprites->first_dirty_rect(cliprect); rect != nullptr; rect = rect->next())
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for (int y = rect->min_y; y <= rect->max_y; y++)
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{
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uint16_t *dest = &bitmap.pix(y);
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uint16_t *src = &sprites.pix(y);
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uint8_t *pri = &screen.priority().pix(y);
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for (int x = rect->min_x; x <= rect->max_x; x++)
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{
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// only process written pixels
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uint16_t pix = src[x];
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if (pix != 0xffff)
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{
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// compare sprite priority against tilemap priority
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int priority = (pix >> 12) & 3;
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if ((1 << priority) > pri[x])
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{
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// if the shadow flag is set, this triggers shadow/hilight for pen 0xa
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if ((pix & 0x400f) == 0x400a)
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dest[x] += (m_paletteram[dest[x]] & 0x8000) ? m_palette_entries*2 : m_palette_entries;
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// otherwise, just add in sprite palette base
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else
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dest[x] = pix & 0xfff;
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}
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}
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}
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}
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return 0;
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}
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