/*
 * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
 *
 * 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.
 *
 */

#include "pipe/p_defines.h"
#include "util/u_format.h"

#include "fd3_format.h"

/* Specifies the table of all the formats and their features. Also supplies
 * the helpers that look up various data in those tables.
 */

struct fd3_format {
	enum a3xx_vtx_fmt vtx;
	enum a3xx_tex_fmt tex;
	enum a3xx_color_fmt rb;
	enum a3xx_color_swap swap;
	boolean present;
};

#define RB_NONE ~0

/* vertex + texture */
#define VT(pipe, fmt, rbfmt, swapfmt) \
	[PIPE_FORMAT_ ## pipe] = { \
		.present = 1, \
		.vtx = VFMT_ ## fmt, \
		.tex = TFMT_ ## fmt, \
		.rb = RB_ ## rbfmt, \
		.swap = swapfmt \
	}

/* texture-only */
#define _T(pipe, fmt, rbfmt, swapfmt) \
	[PIPE_FORMAT_ ## pipe] = { \
		.present = 1, \
		.vtx = ~0, \
		.tex = TFMT_ ## fmt, \
		.rb = RB_ ## rbfmt, \
		.swap = swapfmt \
	}

/* vertex-only */
#define V_(pipe, fmt, rbfmt, swapfmt) \
	[PIPE_FORMAT_ ## pipe] = { \
		.present = 1, \
		.vtx = VFMT_ ## fmt, \
		.tex = ~0, \
		.rb = RB_ ## rbfmt, \
		.swap = swapfmt \
	}

static struct fd3_format formats[PIPE_FORMAT_COUNT] = {
	/* 8-bit */
	VT(R8_UNORM,   8_UNORM, R8_UNORM, WZYX),
	VT(R8_SNORM,   8_SNORM, NONE,     WZYX),
	VT(R8_UINT,    8_UINT,  R8_UINT,  WZYX),
	VT(R8_SINT,    8_SINT,  R8_SINT,  WZYX),
	V_(R8_USCALED, 8_UINT,  NONE,     WZYX),
	V_(R8_SSCALED, 8_UINT,  NONE,     WZYX),

	_T(A8_UNORM,   8_UNORM, A8_UNORM, WZYX),
	_T(L8_UNORM,   8_UNORM, R8_UNORM, WZYX),
	_T(I8_UNORM,   8_UNORM, NONE,     WZYX),

	_T(A8_UINT,    8_UINT,  NONE,     WZYX),
	_T(A8_SINT,    8_SINT,  NONE,     WZYX),
	_T(L8_UINT,    8_UINT,  NONE,     WZYX),
	_T(L8_SINT,    8_SINT,  NONE,     WZYX),
	_T(I8_UINT,    8_UINT,  NONE,     WZYX),
	_T(I8_SINT,    8_SINT,  NONE,     WZYX),

	_T(S8_UINT,    8_UINT,  R8_UNORM, WZYX),

	/* 16-bit */
	VT(R16_UNORM,   16_UNORM, NONE,     WZYX),
	VT(R16_SNORM,   16_SNORM, NONE,     WZYX),
	VT(R16_UINT,    16_UINT,  R16_UINT, WZYX),
	VT(R16_SINT,    16_SINT,  R16_SINT, WZYX),
	V_(R16_USCALED, 16_UINT,  NONE,     WZYX),
	V_(R16_SSCALED, 16_UINT,  NONE,     WZYX),
	VT(R16_FLOAT,   16_FLOAT, R16_FLOAT,WZYX),

	_T(A16_UINT,    16_UINT,  NONE,     WZYX),
	_T(A16_SINT,    16_SINT,  NONE,     WZYX),
	_T(L16_UINT,    16_UINT,  NONE,     WZYX),
	_T(L16_SINT,    16_SINT,  NONE,     WZYX),
	_T(I16_UINT,    16_UINT,  NONE,     WZYX),
	_T(I16_SINT,    16_SINT,  NONE,     WZYX),

	VT(R8G8_UNORM,   8_8_UNORM, R8G8_UNORM, WZYX),
	VT(R8G8_SNORM,   8_8_SNORM, R8G8_SNORM, WZYX),
	VT(R8G8_UINT,    8_8_UINT,  NONE,       WZYX),
	VT(R8G8_SINT,    8_8_SINT,  NONE,       WZYX),
	V_(R8G8_USCALED, 8_8_UINT,  NONE,       WZYX),
	V_(R8G8_SSCALED, 8_8_SINT,  NONE,       WZYX),

	_T(L8A8_UINT,    8_8_UINT,  NONE,       WZYX),
	_T(L8A8_SINT,    8_8_SINT,  NONE,       WZYX),

	_T(Z16_UNORM,      Z16_UNORM,     R8G8_UNORM,     WZYX),
	_T(B5G6R5_UNORM,   5_6_5_UNORM,   R5G6B5_UNORM,   WXYZ),
	_T(B5G5R5A1_UNORM, 5_5_5_1_UNORM, R5G5B5A1_UNORM, WXYZ),
	_T(B5G5R5X1_UNORM, 5_5_5_1_UNORM, R5G5B5A1_UNORM, WXYZ),
	_T(B4G4R4A4_UNORM, 4_4_4_4_UNORM, R4G4B4A4_UNORM, WXYZ),

	/* 24-bit */
	V_(R8G8B8_UNORM,   8_8_8_UNORM, NONE, WZYX),
	V_(R8G8B8_SNORM,   8_8_8_SNORM, NONE, WZYX),
	V_(R8G8B8_UINT,    8_8_8_UINT,  NONE, WZYX),
	V_(R8G8B8_SINT,    8_8_8_SINT,  NONE, WZYX),
	V_(R8G8B8_USCALED, 8_8_8_UINT,  NONE, WZYX),
	V_(R8G8B8_SSCALED, 8_8_8_SINT,  NONE, WZYX),

	/* 32-bit */
	VT(R32_UINT,    32_UINT,  R32_UINT, WZYX),
	VT(R32_SINT,    32_SINT,  R32_SINT, WZYX),
	V_(R32_USCALED, 32_UINT,  NONE,     WZYX),
	V_(R32_SSCALED, 32_UINT,  NONE,     WZYX),
	VT(R32_FLOAT,   32_FLOAT, R32_FLOAT,WZYX),
	V_(R32_FIXED,   32_FIXED, NONE,     WZYX),

	_T(A32_UINT,    32_UINT,  NONE,     WZYX),
	_T(A32_SINT,    32_SINT,  NONE,     WZYX),
	_T(L32_UINT,    32_UINT,  NONE,     WZYX),
	_T(L32_SINT,    32_SINT,  NONE,     WZYX),
	_T(I32_UINT,    32_UINT,  NONE,     WZYX),
	_T(I32_SINT,    32_SINT,  NONE,     WZYX),

	VT(R16G16_UNORM,   16_16_UNORM, NONE,        WZYX),
	VT(R16G16_SNORM,   16_16_SNORM, NONE,        WZYX),
	VT(R16G16_UINT,    16_16_UINT,  R16G16_UINT, WZYX),
	VT(R16G16_SINT,    16_16_SINT,  R16G16_SINT, WZYX),
	V_(R16G16_USCALED, 16_16_UINT,  NONE,        WZYX),
	V_(R16G16_SSCALED, 16_16_SINT,  NONE,        WZYX),
	VT(R16G16_FLOAT,   16_16_FLOAT, R16G16_FLOAT,WZYX),

	_T(L16A16_UINT,    16_16_UINT,  NONE,        WZYX),
	_T(L16A16_SINT,    16_16_SINT,  NONE,        WZYX),

	VT(R8G8B8A8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, WZYX),
	_T(R8G8B8X8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, WZYX),
	_T(R8G8B8A8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, WZYX),
	_T(R8G8B8X8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, WZYX),
	VT(R8G8B8A8_SNORM,   8_8_8_8_SNORM, R8G8B8A8_SNORM, WZYX),
	VT(R8G8B8A8_UINT,    8_8_8_8_UINT,  R8G8B8A8_UINT,  WZYX),
	VT(R8G8B8A8_SINT,    8_8_8_8_SINT,  R8G8B8A8_SINT,  WZYX),
	V_(R8G8B8A8_USCALED, 8_8_8_8_UINT,  NONE,           WZYX),
	V_(R8G8B8A8_SSCALED, 8_8_8_8_SINT,  NONE,           WZYX),

	VT(B8G8R8A8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, WXYZ),
	_T(B8G8R8X8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, WXYZ),
	VT(B8G8R8A8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, WXYZ),
	_T(B8G8R8X8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, WXYZ),

	VT(A8B8G8R8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, XYZW),
	_T(X8B8G8R8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, XYZW),
	_T(A8B8G8R8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, XYZW),
	_T(X8B8G8R8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, XYZW),

	VT(A8R8G8B8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, ZYXW),
	_T(X8R8G8B8_UNORM,   8_8_8_8_UNORM, R8G8B8A8_UNORM, ZYXW),
	_T(A8R8G8B8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, ZYXW),
	_T(X8R8G8B8_SRGB,    8_8_8_8_UNORM, R8G8B8A8_UNORM, ZYXW),

	VT(R10G10B10A2_UNORM,   10_10_10_2_UNORM, R10G10B10A2_UNORM, WZYX),
	VT(B10G10R10A2_UNORM,   10_10_10_2_UNORM, R10G10B10A2_UNORM, WXYZ),
	_T(B10G10R10X2_UNORM,   10_10_10_2_UNORM, R10G10B10A2_UNORM, WXYZ),
	V_(R10G10B10A2_SNORM,   10_10_10_2_SNORM, NONE,              WZYX),
	V_(B10G10R10A2_SNORM,   10_10_10_2_SNORM, NONE,              WXYZ),
	V_(R10G10B10A2_UINT,    10_10_10_2_UINT,  NONE,              WZYX),
	V_(B10G10R10A2_UINT,    10_10_10_2_UINT,  NONE,              WXYZ),
	V_(R10G10B10A2_USCALED, 10_10_10_2_UINT,  NONE,              WZYX),
	V_(B10G10R10A2_USCALED, 10_10_10_2_UINT,  NONE,              WXYZ),
	V_(R10G10B10A2_SSCALED, 10_10_10_2_SINT,  NONE,              WZYX),
	V_(B10G10R10A2_SSCALED, 10_10_10_2_SINT,  NONE,              WXYZ),

	_T(R11G11B10_FLOAT, 11_11_10_FLOAT, R11G11B10_FLOAT, WZYX),
	_T(R9G9B9E5_FLOAT,  9_9_9_E5_FLOAT, NONE,            WZYX),

	_T(Z24X8_UNORM,       X8Z24_UNORM, R8G8B8A8_UNORM, WZYX),
	_T(Z24_UNORM_S8_UINT, X8Z24_UNORM, R8G8B8A8_UNORM, WZYX),
	_T(Z32_FLOAT,         Z32_FLOAT,   R8G8B8A8_UNORM, WZYX),
	_T(Z32_FLOAT_S8X24_UINT, Z32_FLOAT,R8G8B8A8_UNORM, WZYX),

	/* 48-bit */
	V_(R16G16B16_UNORM,   16_16_16_UNORM, NONE, WZYX),
	V_(R16G16B16_SNORM,   16_16_16_SNORM, NONE, WZYX),
	V_(R16G16B16_UINT,    16_16_16_UINT,  NONE, WZYX),
	V_(R16G16B16_SINT,    16_16_16_SINT,  NONE, WZYX),
	V_(R16G16B16_USCALED, 16_16_16_UINT,  NONE, WZYX),
	V_(R16G16B16_SSCALED, 16_16_16_SINT,  NONE, WZYX),
	V_(R16G16B16_FLOAT,   16_16_16_FLOAT, NONE, WZYX),

	/* 64-bit */
	VT(R16G16B16A16_UNORM,   16_16_16_16_UNORM, NONE,               WZYX),
	VT(R16G16B16A16_SNORM,   16_16_16_16_SNORM, NONE,               WZYX),
	VT(R16G16B16A16_UINT,    16_16_16_16_UINT,  R16G16B16A16_UINT,  WZYX),
	_T(R16G16B16X16_UINT,    16_16_16_16_UINT,  R16G16B16A16_UINT,  WZYX),
	VT(R16G16B16A16_SINT,    16_16_16_16_SINT,  R16G16B16A16_SINT,  WZYX),
	_T(R16G16B16X16_SINT,    16_16_16_16_SINT,  R16G16B16A16_SINT,  WZYX),
	V_(R16G16B16A16_USCALED, 16_16_16_16_UINT,  NONE,               WZYX),
	V_(R16G16B16A16_SSCALED, 16_16_16_16_SINT,  NONE,               WZYX),
	VT(R16G16B16A16_FLOAT,   16_16_16_16_FLOAT, R16G16B16A16_FLOAT, WZYX),
	_T(R16G16B16X16_FLOAT,   16_16_16_16_FLOAT, R16G16B16A16_FLOAT, WZYX),

	VT(R32G32_UINT,    32_32_UINT,  R32G32_UINT, WZYX),
	VT(R32G32_SINT,    32_32_SINT,  R32G32_SINT, WZYX),
	V_(R32G32_USCALED, 32_32_UINT,  NONE,        WZYX),
	V_(R32G32_SSCALED, 32_32_SINT,  NONE,        WZYX),
	VT(R32G32_FLOAT,   32_32_FLOAT, R32G32_FLOAT,WZYX),
	V_(R32G32_FIXED,   32_32_FIXED, NONE,        WZYX),

	_T(L32A32_UINT,    32_32_UINT,  NONE,        WZYX),
	_T(L32A32_SINT,    32_32_SINT,  NONE,        WZYX),

	/* 96-bit */
	V_(R32G32B32_UINT,    32_32_32_UINT,  NONE, WZYX),
	V_(R32G32B32_SINT,    32_32_32_SINT,  NONE, WZYX),
	V_(R32G32B32_USCALED, 32_32_32_UINT,  NONE, WZYX),
	V_(R32G32B32_SSCALED, 32_32_32_SINT,  NONE, WZYX),
	V_(R32G32B32_FLOAT,   32_32_32_FLOAT, NONE, WZYX),
	V_(R32G32B32_FIXED,   32_32_32_FIXED, NONE, WZYX),

	/* 128-bit */
	VT(R32G32B32A32_UINT,    32_32_32_32_UINT,  R32G32B32A32_UINT,  WZYX),
	_T(R32G32B32X32_UINT,    32_32_32_32_UINT,  R32G32B32A32_UINT,  WZYX),
	VT(R32G32B32A32_SINT,    32_32_32_32_SINT,  R32G32B32A32_SINT,  WZYX),
	_T(R32G32B32X32_SINT,    32_32_32_32_SINT,  R32G32B32A32_SINT,  WZYX),
	V_(R32G32B32A32_USCALED, 32_32_32_32_UINT,  NONE,               WZYX),
	V_(R32G32B32A32_SSCALED, 32_32_32_32_SINT,  NONE,               WZYX),
	VT(R32G32B32A32_FLOAT,   32_32_32_32_FLOAT, R32G32B32A32_FLOAT, WZYX),
	_T(R32G32B32X32_FLOAT,   32_32_32_32_FLOAT, R32G32B32A32_FLOAT, WZYX),
	V_(R32G32B32A32_FIXED,   32_32_32_32_FIXED, NONE,               WZYX),

	/* compressed */
	_T(ETC1_RGB8, ETC1, NONE, WZYX),
	_T(ETC2_RGB8, ETC2_RGB8, NONE, WZYX),
	_T(ETC2_SRGB8, ETC2_RGB8, NONE, WZYX),
	_T(ETC2_RGB8A1, ETC2_RGB8A1, NONE, WZYX),
	_T(ETC2_SRGB8A1, ETC2_RGB8A1, NONE, WZYX),
	_T(ETC2_RGBA8, ETC2_RGBA8, NONE, WZYX),
	_T(ETC2_SRGBA8, ETC2_RGBA8, NONE, WZYX),
	_T(ETC2_R11_UNORM, ETC2_R11_UNORM, NONE, WZYX),
	_T(ETC2_R11_SNORM, ETC2_R11_SNORM, NONE, WZYX),
	_T(ETC2_RG11_UNORM, ETC2_RG11_UNORM, NONE, WZYX),
	_T(ETC2_RG11_SNORM, ETC2_RG11_SNORM, NONE, WZYX),

	_T(DXT1_RGB,   DXT1, NONE, WZYX),
	_T(DXT1_SRGB,  DXT1, NONE, WZYX),
	_T(DXT1_RGBA,  DXT1, NONE, WZYX),
	_T(DXT1_SRGBA, DXT1, NONE, WZYX),
	_T(DXT3_RGBA,  DXT3, NONE, WZYX),
	_T(DXT3_SRGBA, DXT3, NONE, WZYX),
	_T(DXT5_RGBA,  DXT5, NONE, WZYX),
	_T(DXT5_SRGBA, DXT5, NONE, WZYX),

	/* faked */
	_T(RGTC1_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
	_T(RGTC1_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
	_T(RGTC2_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
	_T(RGTC2_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
	_T(LATC1_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
	_T(LATC1_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
	_T(LATC2_UNORM, 8_8_8_8_UNORM, NONE, WZYX),
	_T(LATC2_SNORM, 8_8_8_8_SNORM, NONE, WZYX),
};

enum a3xx_vtx_fmt
fd3_pipe2vtx(enum pipe_format format)
{
	if (!formats[format].present)
		return ~0;
	return formats[format].vtx;
}

enum a3xx_tex_fmt
fd3_pipe2tex(enum pipe_format format)
{
	if (!formats[format].present)
		return ~0;
	return formats[format].tex;
}

enum a3xx_color_fmt
fd3_pipe2color(enum pipe_format format)
{
	if (!formats[format].present)
		return ~0;
	return formats[format].rb;
}

enum a3xx_color_swap
fd3_pipe2swap(enum pipe_format format)
{
	if (!formats[format].present)
		return WZYX;
	return formats[format].swap;
}

enum a3xx_tex_fetchsize
fd3_pipe2fetchsize(enum pipe_format format)
{
	if (format == PIPE_FORMAT_Z32_FLOAT_S8X24_UINT)
		format = PIPE_FORMAT_Z32_FLOAT;
	else if (util_format_description(format)->layout == UTIL_FORMAT_LAYOUT_RGTC)
		format = PIPE_FORMAT_R8G8B8A8_UNORM;
	switch (util_format_get_blocksizebits(format) / util_format_get_blockwidth(format)) {
	case 8: return TFETCH_1_BYTE;
	case 16: return TFETCH_2_BYTE;
	case 32: return TFETCH_4_BYTE;
	case 64: return TFETCH_8_BYTE;
	case 128: return TFETCH_16_BYTE;
	default:
		debug_printf("Unknown block size for format %s: %d\n",
					 util_format_name(format),
					 util_format_get_blocksizebits(format));
		return TFETCH_DISABLE;
	}
}

unsigned
fd3_pipe2nblocksx(enum pipe_format format, unsigned width)
{
	if (util_format_description(format)->layout == UTIL_FORMAT_LAYOUT_RGTC)
		format = PIPE_FORMAT_R8G8B8A8_UNORM;
	return util_format_get_nblocksx(format, width);
}

enum a3xx_color_fmt
fd3_fs_output_format(enum pipe_format format)
{
	if (util_format_is_srgb(format))
		return RB_R16G16B16A16_FLOAT;
	switch (format) {
	case PIPE_FORMAT_R16_FLOAT:
	case PIPE_FORMAT_R16G16_FLOAT:
	case PIPE_FORMAT_R11G11B10_FLOAT:
		return RB_R16G16B16A16_FLOAT;
	case PIPE_FORMAT_L8_UNORM:
		return RB_R8G8B8A8_UNORM;
	default:
		return fd3_pipe2color(format);
	}
}

static inline enum a3xx_tex_swiz
tex_swiz(unsigned swiz)
{
	switch (swiz) {
	default:
	case PIPE_SWIZZLE_X: return A3XX_TEX_X;
	case PIPE_SWIZZLE_Y: return A3XX_TEX_Y;
	case PIPE_SWIZZLE_Z: return A3XX_TEX_Z;
	case PIPE_SWIZZLE_W: return A3XX_TEX_W;
	case PIPE_SWIZZLE_0: return A3XX_TEX_ZERO;
	case PIPE_SWIZZLE_1: return A3XX_TEX_ONE;
	}
}

uint32_t
fd3_tex_swiz(enum pipe_format format, unsigned swizzle_r, unsigned swizzle_g,
		unsigned swizzle_b, unsigned swizzle_a)
{
	const struct util_format_description *desc =
			util_format_description(format);
	unsigned char swiz[4] = {
			swizzle_r, swizzle_g, swizzle_b, swizzle_a,
	}, rswiz[4];

	util_format_compose_swizzles(desc->swizzle, swiz, rswiz);

	return A3XX_TEX_CONST_0_SWIZ_X(tex_swiz(rswiz[0])) |
			A3XX_TEX_CONST_0_SWIZ_Y(tex_swiz(rswiz[1])) |
			A3XX_TEX_CONST_0_SWIZ_Z(tex_swiz(rswiz[2])) |
			A3XX_TEX_CONST_0_SWIZ_W(tex_swiz(rswiz[3]));
}
