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/*
* Copyright (c) 2012-2013 Luc Verhaegen <libv@skynet.be>
* Copyright (c) 2018 Alyssa Rosenzweig <alyssa@rosenzweig.io>
*
* 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 <stdio.h>
#include "pan_swizzle.h"
#include "pan_allocate.h"
/* Space a group of 4-bits out. For instance, 0x7 -- that is, 0b111 -- would
* become 0b10101 */
static inline int
space_bits_4(int i)
{
return ((i & 0x8) << 3) |
((i & 0x4) << 2) |
((i & 0x2) << 1) |
((i & 0x1) << 0);
}
/* Generate lookup table for the space filler curve. Note this is a 1:1
* mapping, just with bits twiddled around. */
uint32_t space_filler[16][16];
uint32_t space_filler_packed4[16][4];
void
panfrost_generate_space_filler_indices()
{
for (int y = 0; y < 16; ++y) {
for (int x = 0; x < 16; ++x) {
space_filler[y][x] =
space_bits_4(y ^ x) | (space_bits_4(y) << 1);
}
for (int q = 0; q < 4; ++q) {
space_filler_packed4[y][q] =
(space_filler[y][(q * 4) + 0] << 0) |
(space_filler[y][(q * 4) + 1] << 8) |
(space_filler[y][(q * 4) + 2] << 16) |
(space_filler[y][(q * 4) + 3] << 24);
}
}
}
static void
swizzle_bpp1_align16(int width, int height, int source_stride, int block_pitch,
const uint8_t *pixels,
uint8_t *ldest)
{
for (int y = 0; y < height; ++y) {
{
int block_y = y & ~(0x0f);
int rem_y = y & 0x0f;
uint8_t *block_start_s = ldest + (block_y * block_pitch);
const uint8_t *source_start = pixels + (y * source_stride);
const uint8_t *source_end = source_start + width;
/* Operate on blocks of 16 pixels to minimise bookkeeping */
for (; source_start < source_end; block_start_s += 16 * 16, source_start += 16) {
const uint32_t *src_32 = (const uint32_t *) source_start;
for (int q = 0; q < 4; ++q) {
uint32_t src = src_32[q];
uint32_t spaced = space_filler_packed4[rem_y][q];
uint16_t *bs = (uint16_t *) block_start_s;
int spacedA = (spaced >> 0) & 0xFF;
int spacedB = (spaced >> 16) & 0xFF;
bs[spacedA >> 1] = (src >> 0) & 0xFFFF;
bs[spacedB >> 1] = (src >> 16) & 0xFFFF;
}
}
}
++y;
if (y >= height)
break;
{
int block_y = y & ~(0x0f);
int rem_y = y & 0x0f;
uint8_t *block_start_s = ldest + (block_y * block_pitch);
const uint8_t *source_start = pixels + (y * source_stride);
const uint8_t *source_end = source_start + width;
/* Operate on blocks of 16 pixels to minimise bookkeeping */
for (; source_start < source_end; block_start_s += 16 * 16, source_start += 16) {
const uint32_t *src_32 = (const uint32_t *) source_start;
for (int q = 0; q < 4; ++q) {
uint32_t src = src_32[q];
uint32_t spaced = space_filler_packed4[rem_y][q];
block_start_s[(spaced >> 0) & 0xFF] = (src >> 0) & 0xFF;
block_start_s[(spaced >> 8) & 0xFF] = (src >> 8) & 0xFF;
block_start_s[(spaced >> 16) & 0xFF] = (src >> 16) & 0xFF;
block_start_s[(spaced >> 24) & 0xFF] = (src >> 24) & 0xFF;
}
}
}
}
}
static void
swizzle_bpp4_align16(int width, int height, int source_stride, int block_pitch,
const uint32_t *pixels,
uint32_t *ldest)
{
for (int y = 0; y < height; ++y) {
int block_y = y & ~(0x0f);
int rem_y = y & 0x0f;
uint32_t *block_start_s = ldest + (block_y * block_pitch);
const uint32_t *source_start = pixels + (y * source_stride);
const uint32_t *source_end = source_start + width;
/* Operate on blocks of 16 pixels to minimise bookkeeping */
for (; source_start < source_end; block_start_s += 16 * 16, source_start += 16) {
for (int j = 0; j < 16; ++j)
block_start_s[space_filler[rem_y][j]] = source_start[j];
}
}
}
void
panfrost_texture_swizzle(unsigned off_x,
unsigned off_y,
int width, int height, int bytes_per_pixel, int dest_width,
const uint8_t *pixels,
uint8_t *ldest)
{
/* Calculate maximum size, overestimating a bit */
int block_pitch = ALIGN(dest_width, 16) >> 4;
/* Strides must be tight, since we're only ever called indirectly */
int source_stride = width * bytes_per_pixel;
/* Use fast path if available */
if (!(off_x || off_y) && (width == dest_width)) {
if (bytes_per_pixel == 4 && (ALIGN(width, 16) == width)) {
swizzle_bpp4_align16(width, height, source_stride >> 2, (block_pitch * 256 >> 4), (const uint32_t *) pixels, (uint32_t *) ldest);
return;
} else if (bytes_per_pixel == 1 && (ALIGN(width, 16) == width)) {
swizzle_bpp1_align16(width, height, source_stride, (block_pitch * 256 >> 4), pixels, (uint8_t *) ldest);
return;
}
}
/* Otherwise, default back on generic path */
for (int y = 0; y < height; ++y) {
int block_y = (y + off_y) >> 4;
int rem_y = (y + off_y) & 0x0F;
int block_start_s = block_y * block_pitch * 256;
int source_start = y * source_stride;
for (int x = 0; x < width; ++x) {
int block_x_s = ((x + off_x) >> 4) * 256;
int rem_x = (x + off_x) & 0x0F;
int index = space_filler[rem_y][rem_x];
const uint8_t *source = &pixels[source_start + bytes_per_pixel * x];
uint8_t *dest = ldest + bytes_per_pixel * (block_start_s + block_x_s + index);
for (int b = 0; b < bytes_per_pixel; ++b)
dest[b] = source[b];
}
}
}
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