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/*

 * Copyright © 2014 Broadcom

 *

 * 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 (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 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.

 */

/**

 * @file vc4_formats.c

 *

 * Contains the table and accessors for VC4 texture and render target format

 * support.

 *

 * The hardware has limited support for texture formats, and extremely limited

 * support for render target formats.  As a result, we emulate other formats

 * in our shader code, and this stores the table for doing so.

 */

#include "util/u_format.h"

#include "util/macros.h"

#include "vc4_context.h"

#define RT_NO        0

#define RT_RGBA8888  1

#define RT_RGB565    2

struct vc4_format {

        /** Set if the pipe format is defined in the table. */

        bool present;

        /** Set to 0 if unsupported, 1 if RGBA8888, 2 if rgb565. */

        uint8_t rt_type;

        /** One of VC4_TEXTURE_TYPE_*. */

        uint8_t tex_type;

        /**

         * Swizzle to apply to the RGBA shader output for storing to the tile

         * buffer, to the RGBA tile buffer to produce shader input (for

         * blending), and for turning the rgba8888 texture sampler return

         * value into shader rgba values.

         */

        uint8_t swizzle[4];

};

#define SWIZ(x,y,z,w) {          \

        UTIL_FORMAT_SWIZZLE_##x, \

        UTIL_FORMAT_SWIZZLE_##y, \

        UTIL_FORMAT_SWIZZLE_##z, \

        UTIL_FORMAT_SWIZZLE_##w  \

}

#define FORMAT(pipe, rt, tex, swiz)                                     \

        [PIPE_FORMAT_##pipe] = { true, RT_##rt, VC4_TEXTURE_TYPE_##tex, swiz }

static const struct vc4_format vc4_format_table[] = {

        FORMAT(R8G8B8A8_UNORM, RGBA8888, RGBA8888, SWIZ(X, Y, Z, W)),

        FORMAT(R8G8B8X8_UNORM, RGBA8888, RGBA8888, SWIZ(X, Y, Z, 1)),

        FORMAT(R8G8B8A8_SRGB,  RGBA8888, RGBA8888, SWIZ(X, Y, Z, W)),

        FORMAT(R8G8B8X8_SRGB,  RGBA8888, RGBA8888, SWIZ(X, Y, Z, 1)),

        FORMAT(B8G8R8A8_UNORM, RGBA8888, RGBA8888, SWIZ(Z, Y, X, W)),

        FORMAT(B8G8R8X8_UNORM, RGBA8888, RGBA8888, SWIZ(Z, Y, X, 1)),

        FORMAT(B8G8R8A8_SRGB, RGBA8888, RGBA8888, SWIZ(Z, Y, X, W)),

        FORMAT(B8G8R8X8_SRGB, RGBA8888, RGBA8888, SWIZ(Z, Y, X, 1)),

        FORMAT(B5G6R5_UNORM, RGB565, RGB565, SWIZ(X, Y, Z, 1)),

        /* Depth sampling will be handled by doing nearest filtering and not

         * unpacking the RGBA value.

         */

        FORMAT(S8_UINT_Z24_UNORM, NO, RGBA8888, SWIZ(X, Y, Z, W)),

        FORMAT(X8Z24_UNORM,       NO, RGBA8888, SWIZ(X, Y, Z, W)),

        FORMAT(B4G4R4A4_UNORM, NO, RGBA4444, SWIZ(Y, Z, W, X)),

        FORMAT(B4G4R4X4_UNORM, NO, RGBA4444, SWIZ(Y, Z, W, 1)),

        /* It looks like 5551 in the hardware is the other way around from

         * gallium.

         */

        FORMAT(A8_UNORM, NO, ALPHA, SWIZ(0, 0, 0, W)),

        FORMAT(L8_UNORM, NO, ALPHA, SWIZ(W, W, W, 1)),

        FORMAT(I8_UNORM, NO, ALPHA, SWIZ(W, W, W, W)),

        FORMAT(R8_UNORM, NO, ALPHA, SWIZ(W, 0, 0, 1)),

        FORMAT(L8A8_UNORM, NO, LUMALPHA, SWIZ(X, X, X, W)),

        FORMAT(R8G8_UNORM, NO, LUMALPHA, SWIZ(X, W, 0, 1)),

};

static const struct vc4_format *

get_format(enum pipe_format f)

{

        if (f > ARRAY_SIZE(vc4_format_table) ||

            !vc4_format_table[f].present)

                return NULL;

        else

                return &vc4_format_table[f];

}

bool

vc4_rt_format_supported(enum pipe_format f)

{

        const struct vc4_format *vf = get_format(f);

        if (!vf)

                return false;

        return vf->rt_type != RT_NO;

}

bool

vc4_rt_format_is_565(enum pipe_format f)

{

        const struct vc4_format *vf = get_format(f);

        if (!vf)

                return false;

        return vf->rt_type == RT_RGB565;

}

bool

vc4_tex_format_supported(enum pipe_format f)

{

        const struct vc4_format *vf = get_format(f);

        return vf != NULL;

}

uint8_t

vc4_get_tex_format(enum pipe_format f)

{

        const struct vc4_format *vf = get_format(f);

        if (!vf)

                return 0;

        return vf->tex_type;

}

const uint8_t *

vc4_get_format_swizzle(enum pipe_format f)

{

        const struct vc4_format *vf = get_format(f);

        static const uint8_t fallback[] = {0, 1, 2, 3};

        if (!vf)

                return fallback;

        return vf->swizzle;

}