/*

 * QEMU TCX Frame buffer

 *

 * Copyright (c) 2003-2005 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw.h"

#include "sun4m.h"

#include "console.h"

#include "pixel_ops.h"

#define MAXX 1024

#define MAXY 768

#define TCX_DAC_NREGS 16

#define TCX_THC_NREGS_8  0x081c

#define TCX_THC_NREGS_24 0x1000

#define TCX_TEC_NREGS    0x1000

typedef struct TCXState {

    target_phys_addr_t addr;

    DisplayState *ds;

    QEMUConsole *console;

    uint8_t *vram;

    uint32_t *vram24, *cplane;

    ram_addr_t vram_offset, vram24_offset, cplane_offset;

    uint16_t width, height, depth;

    uint8_t r[256], g[256], b[256];

    uint32_t palette[256];

    uint8_t dac_index, dac_state;

} TCXState;

static void tcx_screen_dump(void *opaque, const char *filename);

static void tcx24_screen_dump(void *opaque, const char *filename);

static void tcx_invalidate_display(void *opaque);

static void tcx24_invalidate_display(void *opaque);

static void update_palette_entries(TCXState *s, int start, int end)

{

    int i;

    for(i = start; i < end; i++) {

        switch(ds_get_bits_per_pixel(s->ds)) {

        default:

        case 8:

            s->palette[i] = rgb_to_pixel8(s->r[i], s->g[i], s->b[i]);

            break;

        case 15:

            if (s->ds->bgr)

                s->palette[i] = rgb_to_pixel15bgr(s->r[i], s->g[i], s->b[i]);

            else

                s->palette[i] = rgb_to_pixel15(s->r[i], s->g[i], s->b[i]);

            break;

        case 16:

            if (s->ds->bgr)

                s->palette[i] = rgb_to_pixel16bgr(s->r[i], s->g[i], s->b[i]);

            else

                s->palette[i] = rgb_to_pixel16(s->r[i], s->g[i], s->b[i]);

            break;

        case 32:

            if (s->ds->bgr)

                s->palette[i] = rgb_to_pixel32bgr(s->r[i], s->g[i], s->b[i]);

            else

                s->palette[i] = rgb_to_pixel32(s->r[i], s->g[i], s->b[i]);

            break;

        }

    }

    if (s->depth == 24)

        tcx24_invalidate_display(s);

    else

        tcx_invalidate_display(s);

}

static void tcx_draw_line32(TCXState *s1, uint8_t *d,

                            const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    uint32_t *p = (uint32_t *)d;

    for(x = 0; x < width; x++) {

        val = *s++;

        *p++ = s1->palette[val];

    }

}

static void tcx_draw_line16(TCXState *s1, uint8_t *d,

                            const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    uint16_t *p = (uint16_t *)d;

    for(x = 0; x < width; x++) {

        val = *s++;

        *p++ = s1->palette[val];

    }

}

static void tcx_draw_line8(TCXState *s1, uint8_t *d,

                           const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    for(x = 0; x < width; x++) {

        val = *s++;

        *d++ = s1->palette[val];

    }

}

/*

  XXX Could be much more optimal:

  * detect if line/page/whole screen is in 24 bit mode

  * if destination is also BGR, use memcpy

  */

static inline void tcx24_draw_line32(TCXState *s1, uint8_t *d,

                                     const uint8_t *s, int width,

                                     const uint32_t *cplane,

                                     const uint32_t *s24)

{

    int x, bgr, r, g, b;

    uint8_t val, *p8;

    uint32_t *p = (uint32_t *)d;

    uint32_t dval;

    bgr = s1->ds->bgr;

    for(x = 0; x < width; x++, s++, s24++) {

        if ((be32_to_cpu(*cplane++) & 0xff000000) == 0x03000000) {

            // 24-bit direct, BGR order

            p8 = (uint8_t *)s24;

            p8++;

            b = *p8++;

            g = *p8++;

            r = *p8++;

            if (bgr)

                dval = rgb_to_pixel32bgr(r, g, b);

            else

                dval = rgb_to_pixel32(r, g, b);

        } else {

            val = *s;

            dval = s1->palette[val];

        }

        *p++ = dval;

    }

}

static inline int check_dirty(ram_addr_t page, ram_addr_t page24,

                              ram_addr_t cpage)

{

    int ret;

    unsigned int off;

    ret = cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG);

    for (off = 0; off < TARGET_PAGE_SIZE * 4; off += TARGET_PAGE_SIZE) {

        ret |= cpu_physical_memory_get_dirty(page24 + off, VGA_DIRTY_FLAG);

        ret |= cpu_physical_memory_get_dirty(cpage + off, VGA_DIRTY_FLAG);

    }

    return ret;

}

static inline void reset_dirty(TCXState *ts, ram_addr_t page_min,

                               ram_addr_t page_max, ram_addr_t page24,

                              ram_addr_t cpage)

{

    cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE,

                                    VGA_DIRTY_FLAG);

    page_min -= ts->vram_offset;

    page_max -= ts->vram_offset;

    cpu_physical_memory_reset_dirty(page24 + page_min * 4,

                                    page24 + page_max * 4 + TARGET_PAGE_SIZE,

                                    VGA_DIRTY_FLAG);

    cpu_physical_memory_reset_dirty(cpage + page_min * 4,

                                    cpage + page_max * 4 + TARGET_PAGE_SIZE,

                                    VGA_DIRTY_FLAG);

}

/* Fixed line length 1024 allows us to do nice tricks not possible on

   VGA... */

static void tcx_update_display(void *opaque)

{

    TCXState *ts = opaque;

    ram_addr_t page, page_min, page_max;

    int y, y_start, dd, ds;

    uint8_t *d, *s;

    void (*f)(TCXState *s1, uint8_t *dst, const uint8_t *src, int width);

    if (ds_get_bits_per_pixel(ts->ds) == 0)

        return;

    page = ts->vram_offset;

    y_start = -1;

    page_min = 0xffffffff;

    page_max = 0;

    d = ds_get_data(ts->ds);

    s = ts->vram;

    dd = ds_get_linesize(ts->ds);

    ds = 1024;

    switch (ds_get_bits_per_pixel(ts->ds)) {

    case 32:

        f = tcx_draw_line32;

        break;

    case 15:

    case 16:

        f = tcx_draw_line16;

        break;

    default:

    case 8:

        f = tcx_draw_line8;

        break;

    case 0:

        return;

    }

    for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE) {

        if (cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG)) {

            if (y_start < 0)

                y_start = y;

            if (page < page_min)

                page_min = page;

            if (page > page_max)

                page_max = page;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

        } else {

            if (y_start >= 0) {

                /* flush to display */

                dpy_update(ts->ds, 0, y_start,

                           ts->width, y - y_start);

                y_start = -1;

            }

            d += dd * 4;

            s += ds * 4;

        }

    }

    if (y_start >= 0) {

        /* flush to display */

        dpy_update(ts->ds, 0, y_start,

                   ts->width, y - y_start);

    }

    /* reset modified pages */

    if (page_min <= page_max) {

        cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE,

                                        VGA_DIRTY_FLAG);

    }

}

static void tcx24_update_display(void *opaque)

{

    TCXState *ts = opaque;

    ram_addr_t page, page_min, page_max, cpage, page24;

    int y, y_start, dd, ds;

    uint8_t *d, *s;

    uint32_t *cptr, *s24;

    if (ds_get_bits_per_pixel(ts->ds) != 32)

            return;

    page = ts->vram_offset;

    page24 = ts->vram24_offset;

    cpage = ts->cplane_offset;

    y_start = -1;

    page_min = 0xffffffff;

    page_max = 0;

    d = ds_get_data(ts->ds);

    s = ts->vram;

    s24 = ts->vram24;

    cptr = ts->cplane;

    dd = ds_get_linesize(ts->ds);

    ds = 1024;

    for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE,

            page24 += TARGET_PAGE_SIZE, cpage += TARGET_PAGE_SIZE) {

        if (check_dirty(page, page24, cpage)) {

            if (y_start < 0)

                y_start = y;

            if (page < page_min)

                page_min = page;

            if (page > page_max)

                page_max = page;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

        } else {

            if (y_start >= 0) {

                /* flush to display */

                dpy_update(ts->ds, 0, y_start,

                           ts->width, y - y_start);

                y_start = -1;

            }

            d += dd * 4;

            s += ds * 4;

            cptr += ds * 4;

            s24 += ds * 4;

        }

    }

    if (y_start >= 0) {

        /* flush to display */

        dpy_update(ts->ds, 0, y_start,

                   ts->width, y - y_start);

    }

    /* reset modified pages */

    if (page_min <= page_max) {

        reset_dirty(ts, page_min, page_max, page24, cpage);

    }

}

static void tcx_invalidate_display(void *opaque)

{

    TCXState *s = opaque;

    int i;

    for (i = 0; i < MAXX*MAXY; i += TARGET_PAGE_SIZE) {

        cpu_physical_memory_set_dirty(s->vram_offset + i);

    }

}

static void tcx24_invalidate_display(void *opaque)

{

    TCXState *s = opaque;

    int i;

    tcx_invalidate_display(s);

    for (i = 0; i < MAXX*MAXY * 4; i += TARGET_PAGE_SIZE) {

        cpu_physical_memory_set_dirty(s->vram24_offset + i);

        cpu_physical_memory_set_dirty(s->cplane_offset + i);

    }

}

static void tcx_save(QEMUFile *f, void *opaque)

{

    TCXState *s = opaque;

    qemu_put_be16s(f, &s->height);

    qemu_put_be16s(f, &s->width);

    qemu_put_be16s(f, &s->depth);

    qemu_put_buffer(f, s->r, 256);

    qemu_put_buffer(f, s->g, 256);

    qemu_put_buffer(f, s->b, 256);

    qemu_put_8s(f, &s->dac_index);

    qemu_put_8s(f, &s->dac_state);

}

static int tcx_load(QEMUFile *f, void *opaque, int version_id)

{

    TCXState *s = opaque;

    uint32_t dummy;

    if (version_id != 3 && version_id != 4)

        return -EINVAL;

    if (version_id == 3) {

        qemu_get_be32s(f, &dummy);

        qemu_get_be32s(f, &dummy);

        qemu_get_be32s(f, &dummy);

    }

    qemu_get_be16s(f, &s->height);

    qemu_get_be16s(f, &s->width);

    qemu_get_be16s(f, &s->depth);

    qemu_get_buffer(f, s->r, 256);

    qemu_get_buffer(f, s->g, 256);

    qemu_get_buffer(f, s->b, 256);

    qemu_get_8s(f, &s->dac_index);

    qemu_get_8s(f, &s->dac_state);

    update_palette_entries(s, 0, 256);

    if (s->depth == 24)

        tcx24_invalidate_display(s);

    else

        tcx_invalidate_display(s);

    return 0;

}

static void tcx_reset(void *opaque)

{

    TCXState *s = opaque;

    /* Initialize palette */

    memset(s->r, 0, 256);

    memset(s->g, 0, 256);

    memset(s->b, 0, 256);

    s->r[255] = s->g[255] = s->b[255] = 255;

    update_palette_entries(s, 0, 256);

    memset(s->vram, 0, MAXX*MAXY);

    cpu_physical_memory_reset_dirty(s->vram_offset, s->vram_offset +

                                    MAXX * MAXY * (1 + 4 + 4), VGA_DIRTY_FLAG);

    s->dac_index = 0;

    s->dac_state = 0;

}

static uint32_t tcx_dac_readl(void *opaque, target_phys_addr_t addr)

{

    return 0;

}

static void tcx_dac_writel(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    TCXState *s = opaque;

    switch (addr) {

    case 0:

        s->dac_index = val >> 24;

        s->dac_state = 0;

        break;

    case 4:

        switch (s->dac_state) {

        case 0:

            s->r[s->dac_index] = val >> 24;

            update_palette_entries(s, s->dac_index, s->dac_index + 1);

            s->dac_state++;

            break;

        case 1:

            s->g[s->dac_index] = val >> 24;

            update_palette_entries(s, s->dac_index, s->dac_index + 1);

            s->dac_state++;

            break;

        case 2:

            s->b[s->dac_index] = val >> 24;

            update_palette_entries(s, s->dac_index, s->dac_index + 1);

            s->dac_index = (s->dac_index + 1) & 255; // Index autoincrement

        default:

            s->dac_state = 0;

            break;

        }

        break;

    default:

        break;

    }

    return;

}

static CPUReadMemoryFunc *tcx_dac_read[3] = {

    NULL,

    NULL,

    tcx_dac_readl,

};

static CPUWriteMemoryFunc *tcx_dac_write[3] = {

    NULL,

    NULL,

    tcx_dac_writel,

};

static uint32_t tcx_dummy_readl(void *opaque, target_phys_addr_t addr)

{

    return 0;

}

static void tcx_dummy_writel(void *opaque, target_phys_addr_t addr,

                             uint32_t val)

{

}

static CPUReadMemoryFunc *tcx_dummy_read[3] = {

    NULL,

    NULL,

    tcx_dummy_readl,

};

static CPUWriteMemoryFunc *tcx_dummy_write[3] = {

    NULL,

    NULL,

    tcx_dummy_writel,

};

void tcx_init(DisplayState *ds, target_phys_addr_t addr, uint8_t *vram_base,

              unsigned long vram_offset, int vram_size, int width, int height,

              int depth)

{

    TCXState *s;

    int io_memory, dummy_memory;

    int size;

    s = qemu_mallocz(sizeof(TCXState));

    if (!s)

        return;

    s->ds = ds;

    s->addr = addr;

    s->vram_offset = vram_offset;

    s->width = width;

    s->height = height;

    s->depth = depth;

    // 8-bit plane

    s->vram = vram_base;

    size = vram_size;

    cpu_register_physical_memory(addr + 0x00800000ULL, size, vram_offset);

    vram_offset += size;