/*
 * vicii-chip-model.h - Chip model definitions for the VIC-II emulation.
 *
 * Written by
 *  Daniel Kahlin <daniel@kahlin.net>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 *
 */

#ifndef VICE_VICII_CHIP_MODEL_H
#define VICE_VICII_CHIP_MODEL_H

void vicii_chip_model_init(void);


/*
 * 31-29 Border
 *   000 None
 *   100 Check border L0
 *   101 Check border L1
 *   010 Check border R0
 *   011 Check border R1
 */
#define CHECK_BRD_M       0xe0000000
#define CHECK_BRD_L       0x80000000
#define CHECK_BRD_R       0x40000000
#define CHECK_BRD_CSEL    0x20000000

/*
 * 28-25 Sprites
 *   1--- Check Sprite Exp
 *   -001 Check Sprite Dma
 *   -010 Check Sprite Display
 *   -011 Update MCBASE
 *   -100 Check Sprite Crunch
 */
#define CHECK_SPR_EXP_M   0x10000000

#define CHECK_SPR_M       0x0e000000
#define CHECK_SPR_DMA     0x02000000
#define CHECK_SPR_DISP    0x04000000
#define UPDATE_MCBASE     0x06000000
#define CHECK_SPR_CRUNCH  0x08000000

/*
 * 24-23 VcRc
 *   00  None
 *   10  UpdateVc
 *   01  UpdateRc
 */
#define UPDATE_VC_M       0x01000000
#define UPDATE_RC_M       0x00800000

/*
 * 22    Visible
 */
#define VISIBLE_M         0x00400000

/*
 * 21-16 XPos/8
 */
#define XPOS_M            0x003f0000
#define XPOS_B            16

/*
 * 15    May FetchC
 */
#define PHI2_FETCH_C_M    0x00008000

/*
 * 14-12 Phi1 Fetch sprite num
 */
#define PHI1_SPR_NUM_M    0x00007000
#define PHI1_SPR_NUM_B    12

/*
 * 11-9 Phi1 Fetch
 *   000 Idle
 *   001 Refresh
 *   010 FetchG
 *   011 Sprite Ptr + DMA0
 *   100 Sprite DMA1 + DMA2
 */
#define PHI1_TYPE_M       0x00000e00
#define PHI1_TYPE_B       9
#define PHI1_IDLE         0x00000000
#define PHI1_REFRESH      0x00000200
#define PHI1_FETCH_G      0x00000400
#define PHI1_SPR_PTR      0x00000600
#define PHI1_SPR_DMA1     0x00000800

/*
 * 8-0 Check BA flags
 *   8       Check fetch BA
 *   7-0     Check sprite 7-0 BA
 */
#define FETCH_BA_M        0x00000100
#define FETCH_BA_B        8
#define SPRITE_BA_MASK_M  0x000000ff
#define SPRITE_BA_MASK_B  0

static inline uint8_t cycle_get_sprite_ba_mask(unsigned int flags)
{
    return (flags & SPRITE_BA_MASK_M) >> SPRITE_BA_MASK_B;
}

static inline int cycle_is_fetch_ba(unsigned int flags)
{
    return (flags & FETCH_BA_M) ? 1 : 0;
}

static inline int cycle_is_sprite_ptr_dma0(unsigned int flags)
{
    return (flags & PHI1_TYPE_M) == PHI1_SPR_PTR;
}

static inline int cycle_is_sprite_dma1_dma2(unsigned int flags)
{
    return (flags & PHI1_TYPE_M) == PHI1_SPR_DMA1;
}

static inline int cycle_get_sprite_num(unsigned int flags)
{
    return (flags & PHI1_SPR_NUM_M) >> PHI1_SPR_NUM_B;
}

static inline int cycle_is_refresh(unsigned int flags)
{
    return (flags & PHI1_TYPE_M) == PHI1_REFRESH;
}

static inline int cycle_is_fetch_g(unsigned int flags)
{
    return (flags & PHI1_TYPE_M) == PHI1_FETCH_G;
}

static inline int cycle_may_fetch_c(unsigned int flags)
{
    return (flags & PHI2_FETCH_C_M) ? 1 : 0;
}

static inline int cycle_is_visible(unsigned int flags)
{
    return (flags & VISIBLE_M) ? 1 : 0;
}

static inline int cycle_get_xpos(unsigned int flags)
{
    return ((flags & XPOS_M) >> XPOS_B) << 3;
}

static inline int cycle_is_update_vc(unsigned int flags)
{
    return (flags & UPDATE_VC_M) ? 1 : 0;
}

static inline int cycle_is_update_rc(unsigned int flags)
{
    return (flags & UPDATE_RC_M) ? 1 : 0;
}

static inline int cycle_is_check_spr_crunch(unsigned int flags)
{
    return (flags & CHECK_SPR_M) == CHECK_SPR_CRUNCH;
}

static inline int cycle_is_update_mcbase(unsigned int flags)
{
    return (flags & CHECK_SPR_M) == UPDATE_MCBASE;
}

static inline int cycle_is_check_spr_exp(unsigned int flags)
{
    return (flags & CHECK_SPR_EXP_M) ? 1 : 0;
}

static inline int cycle_is_check_spr_dma(unsigned int flags)
{
    return (flags & CHECK_SPR_M) == CHECK_SPR_DMA;
}

static inline int cycle_is_check_spr_disp(unsigned int flags)
{
    return (flags & CHECK_SPR_M) == CHECK_SPR_DISP;
}

static inline int cycle_is_check_border_l(unsigned int flags, int csel)
{
    if (flags & CHECK_BRD_L) {
        return (flags & CHECK_BRD_CSEL) ? csel : !csel;
    }
    return 0;
}

static inline int cycle_is_check_border_r(unsigned int flags, int csel)
{
    if (flags & CHECK_BRD_R) {
        return (flags & CHECK_BRD_CSEL) ? csel : !csel;
    }
    return 0;
}
#endif
