/*
 * Copyright (c) 2011-2013 Luc Verhaegen <libv@skynet.be>
 * Copyright (c) 2018-2019 Lima Project
 *
 * 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, sub license,
 * 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT. 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 <stdlib.h>

#include <util/macros.h>

#include "lima_format.h"

#define LIMA_TEXEL_FORMAT_L8           0x09
#define LIMA_TEXEL_FORMAT_A8           0x0a
#define LIMA_TEXEL_FORMAT_I8           0x0b
#define LIMA_TEXEL_FORMAT_BGR_565      0x0e
#define LIMA_TEXEL_FORMAT_L8A8         0x11
#define LIMA_TEXEL_FORMAT_L16          0x12
#define LIMA_TEXEL_FORMAT_A16          0x13
#define LIMA_TEXEL_FORMAT_I16          0x14
#define LIMA_TEXEL_FORMAT_RGB_888      0x15
#define LIMA_TEXEL_FORMAT_RGBA_8888    0x16
#define LIMA_TEXEL_FORMAT_RGBX_8888    0x17
#define LIMA_TEXEL_FORMAT_Z24S8        0x2c
#define LIMA_TEXEL_FORMAT_NONE         -1

#define LIMA_PIXEL_FORMAT_B5G6R5       0x00
#define LIMA_PIXEL_FORMAT_B8G8R8A8     0x03
#define LIMA_PIXEL_FORMAT_Z16          0x0e
#define LIMA_PIXEL_FORMAT_Z24S8        0x0f
#define LIMA_PIXEL_FORMAT_NONE         -1

struct lima_format {
   bool present;
   int texel;
   int pixel;
   bool swap_r_b;
};

#define LIMA_FORMAT(pipe, tex, pix, swap)                \
   [PIPE_FORMAT_##pipe] = {                              \
      .present = true, .texel = LIMA_TEXEL_FORMAT_##tex, \
      .pixel = LIMA_PIXEL_FORMAT_##pix, .swap_r_b = swap, \
   }

static const struct lima_format lima_format_table[] = {
   LIMA_FORMAT(R8G8B8A8_UNORM,     RGBA_8888, B8G8R8A8, true),
   LIMA_FORMAT(B8G8R8A8_UNORM,     RGBA_8888, B8G8R8A8, false),
   LIMA_FORMAT(R8G8B8A8_SRGB,      RGBA_8888, B8G8R8A8, true),
   LIMA_FORMAT(B8G8R8A8_SRGB,      RGBA_8888, B8G8R8A8, false),
   LIMA_FORMAT(R8G8B8X8_UNORM,     RGBX_8888, B8G8R8A8, true),
   LIMA_FORMAT(B8G8R8X8_UNORM,     RGBX_8888, B8G8R8A8, false),
   LIMA_FORMAT(B5G6R5_UNORM,       BGR_565,   B5G6R5,   false),
   LIMA_FORMAT(Z24_UNORM_S8_UINT,  Z24S8,     Z24S8,    false),
   LIMA_FORMAT(Z24X8_UNORM,        Z24S8,     Z24S8,    false),
   /* Blob uses L16 for Z16 */
   LIMA_FORMAT(Z16_UNORM,          L16,       Z16,      false),
   LIMA_FORMAT(L16_UNORM,          L16,       NONE,     false),
   LIMA_FORMAT(L8_UNORM,           L8,        NONE,     false),
   LIMA_FORMAT(A16_UNORM,          A16,       NONE,     false),
   LIMA_FORMAT(A8_UNORM,           A8,        NONE,     false),
   LIMA_FORMAT(I16_UNORM,          I16,       NONE,     false),
   LIMA_FORMAT(I8_UNORM,           I8,        NONE,     false),
   LIMA_FORMAT(L8A8_UNORM,         L8A8,      NONE,     false),
};

static const struct lima_format *
get_format(enum pipe_format f)
{
   if (f >= ARRAY_SIZE(lima_format_table) ||
       !lima_format_table[f].present)
      return NULL;

   return lima_format_table + f;
}

bool
lima_format_texel_supported(enum pipe_format f)
{
   const struct lima_format *lf = get_format(f);

   if (!lf)
      return false;

   return lf->texel != LIMA_TEXEL_FORMAT_NONE;
}

bool
lima_format_pixel_supported(enum pipe_format f)
{
   const struct lima_format *lf = get_format(f);

   if (!lf)
      return false;

   return lf->pixel != LIMA_PIXEL_FORMAT_NONE;
}

int
lima_format_get_texel(enum pipe_format f)
{
   return lima_format_table[f].texel;
}

int
lima_format_get_pixel(enum pipe_format f)
{
   return lima_format_table[f].pixel;
}

bool
lima_format_get_swap_rb(enum pipe_format f)
{
   return lima_format_table[f].swap_r_b;
}