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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;
}
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