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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_tiling.c
+ *
+ * Handles information about the VC4 tiling formats, and loading and storing
+ * from them.
+ *
+ * Texture mipmap levels on VC4 are (with the exception of 32-bit RGBA raster
+ * textures for scanout) stored as groups of microtiles. If the texture is at
+ * least 4x4 microtiles (utiles), then those microtiles are arranged in a sort
+ * of Hilbert-fractal-ish layout (T), otherwise the microtiles are in raster
+ * order (LT).
+ *
+ * Specifically, the T format has:
+ *
+ * - 64b utiles of pixels in a raster-order grid according to cpp. It's 4x4
+ * pixels at 32 bit depth.
+ *
+ * - 1k subtiles made of a 4x4 raster-order grid of 64b utiles (so usually
+ * 16x16 pixels).
+ *
+ * - 4k tiles made of a 2x2 grid of 1k subtiles (so usually 32x32 pixels). On
+ * even 4k tile rows, they're arranged as (BL, TL, TR, BR), and on odd rows
+ * they're (TR, BR, BL, TL), where bottom left is start of memory.
+ *
+ * - an image made of 4k tiles in rows either left-to-right (even rows of 4k
+ * tiles) or right-to-left (odd rows of 4k tiles).
+ */
+
+#include "vc4_screen.h"
+#include "vc4_context.h"
+#include "vc4_tiling.h"
+
+/** Return the width in pixels of a 64-byte microtile. */
+uint32_t
+vc4_utile_width(int cpp)
+{
+ switch (cpp) {
+ case 1:
+ case 2:
+ return 8;
+ case 4:
+ return 4;
+ case 8:
+ return 2;
+ default:
+ fprintf(stderr, "unknown cpp: %d\n", cpp);
+ abort();
+ }
+}
+
+/** Return the height in pixels of a 64-byte microtile. */
+uint32_t
+vc4_utile_height(int cpp)
+{
+ switch (cpp) {
+ case 1:
+ return 8;
+ case 2:
+ case 4:
+ case 8:
+ return 4;
+ default:
+ fprintf(stderr, "unknown cpp: %d\n", cpp);
+ abort();
+ }
+}
+
+/**
+ * The texture unit decides what tiling format a particular miplevel is using
+ * this function, so we lay out our miptrees accordingly.
+ */
+bool
+vc4_size_is_lt(uint32_t width, uint32_t height, int cpp)
+{
+ return (width <= 4 * vc4_utile_width(cpp) ||
+ height <= 4 * vc4_utile_height(cpp));
+}
+
+void
+vc4_load_utile(void *dst, void *src, uint32_t dst_stride, uint32_t cpp)
+{
+ uint32_t utile_h = vc4_utile_height(cpp);
+ uint32_t row_size = 64 / utile_h;
+
+ for (int y = 0; y < utile_h; y++) {
+ memcpy(dst, src, row_size);
+ dst += dst_stride;
+ src += row_size;
+ }
+}
+
+void
+vc4_store_utile(void *dst, void *src, uint32_t src_stride, uint32_t cpp)
+{
+ uint32_t utile_h = vc4_utile_height(cpp);
+ uint32_t row_size = 64 / utile_h;
+
+ for (int y = 0; y < utile_h; y++) {
+ memcpy(dst, src, row_size);
+ dst += row_size;
+ src += src_stride;
+ }
+}
+
+static void
+check_box_utile_alignment(const struct pipe_box *box, int cpp)
+{
+ uint32_t utile_w = vc4_utile_width(cpp);
+ uint32_t utile_h = vc4_utile_height(cpp);
+
+ assert(!(box->x & (utile_w - 1)));
+ assert(!(box->y & (utile_h - 1)));
+ assert(!(box->width & (utile_w - 1)));
+ assert(!(box->height & (utile_h - 1)));
+}
+
+static void
+vc4_load_lt_image(void *dst, uint32_t dst_stride,
+ void *src, uint32_t src_stride,
+ int cpp, const struct pipe_box *box)
+{
+ uint32_t utile_w = vc4_utile_width(cpp);
+ uint32_t utile_h = vc4_utile_height(cpp);
+ uint32_t xstart = box->x / utile_w;
+ uint32_t ystart = box->y / utile_h;
+
+ for (uint32_t y = 0; y < box->height; y += utile_h) {
+ for (int x = 0; x < box->width; x += utile_w) {
+ vc4_load_utile(dst + (dst_stride * y +
+ x * cpp),
+ src + ((ystart + y) * src_stride +
+ (xstart + x) * 64 / utile_w),
+ dst_stride, cpp);
+ }
+ }
+}
+
+static void
+vc4_store_lt_image(void *dst, uint32_t dst_stride,
+ void *src, uint32_t src_stride,
+ int cpp, const struct pipe_box *box)
+{
+ uint32_t utile_w = vc4_utile_width(cpp);
+ uint32_t utile_h = vc4_utile_height(cpp);
+ uint32_t xstart = box->x / utile_w;
+ uint32_t ystart = box->y / utile_h;
+
+ for (uint32_t y = 0; y < box->height; y += utile_h) {
+ for (int x = 0; x < box->width; x += utile_w) {
+ vc4_store_utile(dst + ((ystart + y) * dst_stride +
+ (xstart + x) * 64 / utile_w),
+ src + (src_stride * y +
+ x * cpp),
+ src_stride, cpp);
+ }
+ }
+}
+
+/**
+ * Takes a utile x and y (and the number of utiles of width of the image) and
+ * returns the offset to the utile within a VC4_TILING_FORMAT_TF image.
+ */
+static uint32_t
+t_utile_address(uint32_t utile_x, uint32_t utile_y,
+ uint32_t utile_stride)
+{
+ /* T images have to be aligned to 8 utiles (4x4 subtiles, which are
+ * 2x2 in a 4k tile).
+ */
+ assert(!(utile_stride & 7));
+ uint32_t tile_stride = utile_stride >> 3;
+ /* 4k tile offsets. */
+ uint32_t tile_x = utile_x >> 3;
+ uint32_t tile_y = utile_y >> 3;
+ bool odd_tile_y = tile_y & 1;
+
+ /* Odd lines of 4k tiles go right-to-left. */
+ if (odd_tile_y)
+ tile_x = tile_stride - tile_x - 1;
+
+ uint32_t tile_offset = 4096 * (tile_y * tile_stride + tile_x);
+
+ uint32_t stile_x = (utile_x >> 2) & 1;
+ uint32_t stile_y = (utile_y >> 2) & 1;
+ uint32_t stile_index = (stile_y << 1) + stile_x;
+ static const uint32_t odd_stile_map[4] = {2, 1, 3, 0};
+ static const uint32_t even_stile_map[4] = {0, 3, 1, 2};
+
+ uint32_t stile_offset = 1024 * (odd_tile_y ?
+ odd_stile_map[stile_index] :
+ even_stile_map[stile_index]);
+
+ uint32_t utile_offset = 64 * ((utile_y & 3) * 4 + (utile_x & 3));
+
+#if 0
+ fprintf(stderr, "utile %d,%d -> %d + %d + %d (stride %d,%d) = %d\n",
+ utile_x, utile_y,
+ tile_offset, stile_offset, utile_offset,
+ utile_stride, tile_stride,
+ tile_offset + stile_offset + utile_offset);
+#endif
+
+ return tile_offset + stile_offset + utile_offset;
+}
+
+static void
+vc4_load_t_image(void *dst, uint32_t dst_stride,
+ void *src, uint32_t src_stride,
+ int cpp, const struct pipe_box *box)
+{
+ uint32_t utile_w = vc4_utile_width(cpp);
+ uint32_t utile_h = vc4_utile_height(cpp);
+ uint32_t utile_stride = src_stride / cpp / utile_w;
+ uint32_t xstart = box->x / utile_w;
+ uint32_t ystart = box->y / utile_h;
+
+ for (uint32_t y = 0; y < box->height / utile_h; y++) {
+ for (int x = 0; x < box->width / utile_w; x++) {
+ vc4_load_utile(dst + (y * utile_h * dst_stride +
+ x * utile_w * cpp),
+ src + t_utile_address(xstart + x,
+ ystart + y,
+ utile_stride),
+ dst_stride, cpp);
+ }
+ }
+}
+
+static void
+vc4_store_t_image(void *dst, uint32_t dst_stride,
+ void *src, uint32_t src_stride,
+ int cpp, const struct pipe_box *box)
+{
+ uint32_t utile_w = vc4_utile_width(cpp);
+ uint32_t utile_h = vc4_utile_height(cpp);
+ uint32_t utile_stride = dst_stride / cpp / utile_w;
+ uint32_t xstart = box->x / utile_w;
+ uint32_t ystart = box->y / utile_h;
+
+ for (uint32_t y = 0; y < box->height / utile_h; y++) {
+ for (int x = 0; x < box->width / utile_w; x++) {
+ vc4_store_utile(dst + t_utile_address(xstart + x,
+ ystart + y,
+ utile_stride),
+ src + (y * utile_h * src_stride +
+ x * utile_w * cpp),
+ src_stride, cpp);
+ }
+ }
+}
+
+/**
+ * Loads pixel data from the start (microtile-aligned) box in @src to the
+ * start of @dst according to the given tiling format.
+ */
+void
+vc4_load_tiled_image(void *dst, uint32_t dst_stride,
+ void *src, uint32_t src_stride,
+ uint8_t tiling_format, int cpp,
+ const struct pipe_box *box)
+{
+ check_box_utile_alignment(box, cpp);
+
+ if (tiling_format == VC4_TILING_FORMAT_LT) {
+ vc4_load_lt_image(dst, dst_stride,
+ src, src_stride,
+ cpp, box);
+ } else {
+ assert(tiling_format == VC4_TILING_FORMAT_T);
+ vc4_load_t_image(dst, dst_stride,
+ src, src_stride,
+ cpp, box);
+ }
+}
+
+/**
+ * Stores pixel data from the start of @src into a (microtile-aligned) box in
+ * @dst according to the given tiling format.
+ */
+void
+vc4_store_tiled_image(void *dst, uint32_t dst_stride,
+ void *src, uint32_t src_stride,
+ uint8_t tiling_format, int cpp,
+ const struct pipe_box *box)
+{
+ check_box_utile_alignment(box, cpp);
+
+ if (tiling_format == VC4_TILING_FORMAT_LT) {
+ vc4_store_lt_image(dst, dst_stride,
+ src, src_stride,
+ cpp, box);
+ } else {
+ assert(tiling_format == VC4_TILING_FORMAT_T);
+ vc4_store_t_image(dst, dst_stride,
+ src, src_stride,
+ cpp, box);
+ }
+}
+
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