// license:BSD-3-Clause // copyright-holders:Olivier Galibert /* * Sega System 24 * */ #include #include #include "emu.h" #include "video/segaic24.h" #include "includes/segas24.h" namespace { struct layer_sort { layer_sort(segas24_mixer_device &_mixer) : mixer(_mixer) { } bool operator()(int l1, int l2) { static const int default_pri[12] = { 0, 1, 2, 3, 4, 5, 6, 7, -4, -3, -2, -1 }; int p1 = mixer.get_reg(l1) & 7; int p2 = mixer.get_reg(l2) & 7; if(p1 != p2) return p1 - p2 < 0; return default_pri[l2] - default_pri[l1] < 0; } segas24_mixer_device &mixer; }; } uint32_t segas24_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { if(m_vmixer->get_reg(13) & 1) { bitmap.fill(m_palette->black_pen()); return 0; } screen.priority().fill(0); bitmap.fill(0, cliprect); std::vector order; order.resize(12); for(int i=0; i<12; i++) order[i] = i; std::sort(order.begin(), order.end(), layer_sort(*m_vmixer)); int spri[4]; int level = 0; for(int i=0; i<12; i++) if(order[i] < 8) m_vtile->draw(screen, bitmap, cliprect, order[i], level, 0); else { spri[order[i]-8] = level; level++; } m_vsprite->draw(bitmap, cliprect, screen.priority(), spri); return 0; }