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/*
* Copyright (c) 2019 Etnaviv Project
* Copyright (C) 2019 Zodiac Inflight Innovations
*
* 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.
*
* Authors:
* Christian Gmeiner <christian.gmeiner@gmail.com>
*/
#include "etnaviv_etc2.h"
#include "etnaviv_resource.h"
#include "etnaviv_screen.h"
#include "hw/common.xml.h"
#include "util/format/u_format.h"
bool
etna_etc2_needs_patching(const struct pipe_resource *prsc)
{
const struct etna_screen *screen = etna_screen(prsc->screen);
if (!util_format_is_etc(prsc->format))
return false;
if (VIV_FEATURE(screen, chipMinorFeatures2, HALTI1))
return false;
switch (prsc->format) {
case PIPE_FORMAT_ETC2_RGB8:
case PIPE_FORMAT_ETC2_SRGB8:
case PIPE_FORMAT_ETC2_RGB8A1:
case PIPE_FORMAT_ETC2_SRGB8A1:
case PIPE_FORMAT_ETC2_RGBA8:
case PIPE_FORMAT_ETC2_SRGBA8:
return true;
break;
default:
return false;
}
}
static inline bool
needs_patching(uint8_t *buffer, bool punchthrough_alpha)
{
/* punchthrough_alpha or etc2 individual mode? */
if (!punchthrough_alpha && !(buffer[3] & 0x2))
return false;
/* etc2 t-mode? */
static const int lookup[8] = { 0, 1, 2, 3, -4, -3, -2, -1 };
const int R_plus_dR = (buffer[0] >> 3) + lookup[buffer[0] & 0x7];
if (R_plus_dR < 0 || R_plus_dR > 31)
return true;
return false;
}
void
etna_etc2_calculate_blocks(uint8_t *buffer, unsigned stride,
unsigned width, unsigned height,
enum pipe_format format,
struct util_dynarray *offsets)
{
const unsigned bw = util_format_get_blockwidth(format);
const unsigned bh = util_format_get_blockheight(format);
const unsigned bs = util_format_get_blocksize(format);
bool punchthrough_alpha = false;
unsigned offset = 0;
const uint8_t *base = buffer;
if (format == PIPE_FORMAT_ETC2_RGB8A1 ||
format == PIPE_FORMAT_ETC2_SRGB8A1)
punchthrough_alpha = true;
if (format == PIPE_FORMAT_ETC2_RGBA8 ||
format == PIPE_FORMAT_ETC2_SRGBA8 ||
format == PIPE_FORMAT_ETC2_SRGB8A1)
offset = 8;
for (unsigned y = 0; y < height; y += bh) {
uint8_t *src = buffer;
for (unsigned x = 0; x < width; x += bw) {
if (needs_patching(src + offset, punchthrough_alpha))
util_dynarray_append(offsets, unsigned, src + offset - base);
src += bs;
}
buffer += stride;
}
}
static inline void
swap_colors(uint8_t *buffer)
{
const uint8_t r1a = (buffer[0] & 0x18) >> 3;
const uint8_t r1b = (buffer[0] & 0x3);
const uint8_t r1 = (r1a << 2) | r1b;
const uint8_t g1 = (buffer[1] & 0xf0) >> 4;
const uint8_t b1 = (buffer[1] & 0x0f);
const uint8_t r2 = (buffer[2] & 0xf0) >> 4;
const uint8_t g2 = buffer[2] & 0x0f;
const uint8_t b2 = (buffer[3] & 0xf0) >> 4;
const uint8_t rest = (buffer[3] & 0x0f);
/* fixup R and dR used for t-mode detection */
static const uint8_t fixup[16] = {
0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0xe0,
0x04, 0x04, 0xe0, 0xe0,
0x04, 0xe0, 0xe0, 0xe0
};
/* swap colors */
buffer[0] = fixup[r2] | ((r2 & 0x0c) << 1) | (r2 & 0x03);
buffer[1] = (g2 << 4) | b2;
buffer[2] = (r1 << 4) | g1;
buffer[3] = (b1 << 4) | rest;
}
void
etna_etc2_patch(uint8_t *buffer, const struct util_dynarray *offsets)
{
util_dynarray_foreach(offsets, unsigned, offset)
swap_colors(buffer + *offset);
}
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