/*
 * Copyright (C) 2017 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.
 *
 * Authors:
 *    Rob Clark <robclark@freedesktop.org>
 */

#include "freedreno_blitter.h"
#include "freedreno_resource.h"

#include "fd5_blitter.h"
#include "fd5_format.h"
#include "fd5_emit.h"

/* Make sure none of the requested dimensions extend beyond the size of the
 * resource.  Not entirely sure why this happens, but sometimes it does, and
 * w/ 2d blt doesn't have wrap modes like a sampler, so force those cases
 * back to u_blitter
 */
static bool
ok_dims(const struct pipe_resource *r, const struct pipe_box *b, int lvl)
{
	return (b->x >= 0) && (b->x + b->width <= u_minify(r->width0, lvl)) &&
		(b->y >= 0) && (b->y + b->height <= u_minify(r->height0, lvl)) &&
		(b->z >= 0) && (b->z + b->depth <= u_minify(r->depth0, lvl));
}

/* Not sure if format restrictions differ for src and dst, or if
 * they only matter when src fmt != dst fmt..  but there appear to
 * be *some* limitations so let's just start rejecting stuff that
 * piglit complains about
 */
static bool
ok_format(enum pipe_format fmt)
{
	if (util_format_is_compressed(fmt))
		return false;

	switch (fmt) {
	case PIPE_FORMAT_R10G10B10A2_SSCALED:
	case PIPE_FORMAT_R10G10B10A2_SNORM:
	case PIPE_FORMAT_B10G10R10A2_USCALED:
	case PIPE_FORMAT_B10G10R10A2_SSCALED:
	case PIPE_FORMAT_B10G10R10A2_SNORM:
	case PIPE_FORMAT_R10G10B10A2_UNORM:
	case PIPE_FORMAT_R10G10B10A2_USCALED:
	case PIPE_FORMAT_B10G10R10A2_UNORM:
	case PIPE_FORMAT_R10SG10SB10SA2U_NORM:
	case PIPE_FORMAT_B10G10R10A2_UINT:
	case PIPE_FORMAT_R10G10B10A2_UINT:
		return false;
	default:
		break;
	}

	if (fd5_pipe2color(fmt) == RB5_NONE)
		return false;

	return true;
}

static bool
can_do_blit(const struct pipe_blit_info *info)
{
	/* I think we can do scaling, but not in z dimension since that would
	 * require blending..
	 */
	if (info->dst.box.depth != info->src.box.depth)
		return false;

	if (!ok_format(info->dst.format))
		return false;

	if (!ok_format(info->src.format))
		return false;

	/* hw ignores {SRC,DST}_INFO.COLOR_SWAP if {SRC,DST}_INFO.TILE_MODE
	 * is set (not linear).  We can kind of get around that when tiling/
	 * untiling by setting both src and dst COLOR_SWAP=WZYX, but that
	 * means the formats must match:
	 */
	if ((fd_resource(info->dst.resource)->layout.tile_mode ||
				fd_resource(info->src.resource)->layout.tile_mode) &&
			info->dst.format != info->src.format)
		return false;

	/* until we figure out a few more registers: */
	if ((info->dst.box.width != info->src.box.width) ||
			(info->dst.box.height != info->src.box.height))
		return false;

	/* src box can be inverted, which we don't support.. dst box cannot: */
	if ((info->src.box.width < 0) || (info->src.box.height < 0))
		return false;

	if (!ok_dims(info->src.resource, &info->src.box, info->src.level))
		return false;

	if (!ok_dims(info->dst.resource, &info->dst.box, info->dst.level))
		return false;

	debug_assert(info->dst.box.width >= 0);
	debug_assert(info->dst.box.height >= 0);
	debug_assert(info->dst.box.depth >= 0);

	if ((info->dst.resource->nr_samples > 1) ||
			(info->src.resource->nr_samples > 1))
		return false;

	if (info->scissor_enable)
		return false;

	if (info->window_rectangle_include)
		return false;

	if (info->render_condition_enable)
		return false;

	if (info->alpha_blend)
		return false;

	if (info->filter != PIPE_TEX_FILTER_NEAREST)
		return false;

	if (info->mask != util_format_get_mask(info->src.format))
		return false;

	if (info->mask != util_format_get_mask(info->dst.format))
		return false;

	return true;
}

static void
emit_setup(struct fd_ringbuffer *ring)
{
	OUT_PKT4(ring, REG_A5XX_RB_RENDER_CNTL, 1);
	OUT_RING(ring, 0x00000008);

	OUT_PKT4(ring, REG_A5XX_UNKNOWN_2100, 1);
	OUT_RING(ring, 0x86000000);   /* UNKNOWN_2100 */

	OUT_PKT4(ring, REG_A5XX_UNKNOWN_2180, 1);
	OUT_RING(ring, 0x86000000);   /* UNKNOWN_2180 */

	OUT_PKT4(ring, REG_A5XX_UNKNOWN_2184, 1);
	OUT_RING(ring, 0x00000009);   /* UNKNOWN_2184 */

	OUT_PKT4(ring, REG_A5XX_RB_CNTL, 1);
	OUT_RING(ring, A5XX_RB_CNTL_BYPASS);

	OUT_PKT4(ring, REG_A5XX_RB_MODE_CNTL, 1);
	OUT_RING(ring, 0x00000004);   /* RB_MODE_CNTL */

	OUT_PKT4(ring, REG_A5XX_SP_MODE_CNTL, 1);
	OUT_RING(ring, 0x0000000c);   /* SP_MODE_CNTL */

	OUT_PKT4(ring, REG_A5XX_TPL1_MODE_CNTL, 1);
	OUT_RING(ring, 0x00000344);   /* TPL1_MODE_CNTL */

	OUT_PKT4(ring, REG_A5XX_HLSQ_MODE_CNTL, 1);
	OUT_RING(ring, 0x00000002);   /* HLSQ_MODE_CNTL */

	OUT_PKT4(ring, REG_A5XX_GRAS_CL_CNTL, 1);
	OUT_RING(ring, 0x00000181);   /* GRAS_CL_CNTL */
}

/* buffers need to be handled specially since x/width can exceed the bounds
 * supported by hw.. if necessary decompose into (potentially) two 2D blits
 */
static void
emit_blit_buffer(struct fd_ringbuffer *ring, const struct pipe_blit_info *info)
{
	const struct pipe_box *sbox = &info->src.box;
	const struct pipe_box *dbox = &info->dst.box;
	struct fd_resource *src, *dst;
	unsigned sshift, dshift;

	src = fd_resource(info->src.resource);
	dst = fd_resource(info->dst.resource);

	debug_assert(src->layout.cpp == 1);
	debug_assert(dst->layout.cpp == 1);
	debug_assert(info->src.resource->format == info->dst.resource->format);
	debug_assert((sbox->y == 0) && (sbox->height == 1));
	debug_assert((dbox->y == 0) && (dbox->height == 1));
	debug_assert((sbox->z == 0) && (sbox->depth == 1));
	debug_assert((dbox->z == 0) && (dbox->depth == 1));
	debug_assert(sbox->width == dbox->width);
	debug_assert(info->src.level == 0);
	debug_assert(info->dst.level == 0);

	/*
	 * Buffers can have dimensions bigger than max width, remap into
	 * multiple 1d blits to fit within max dimension
	 *
	 * Note that blob uses .ARRAY_PITCH=128 for blitting buffers, which
	 * seems to prevent overfetch related faults.  Not quite sure what
	 * the deal is there.
	 *
	 * Low 6 bits of SRC/DST addresses need to be zero (ie. address
	 * aligned to 64) so we need to shift src/dst x1/x2 to make up the
	 * difference.  On top of already splitting up the blit so width
	 * isn't > 16k.
	 *
	 * We perhaps could do a bit better, if src and dst are aligned but
	 * in the worst case this means we have to split the copy up into
	 * 16k (0x4000) minus 64 (0x40).
	 */

	sshift = sbox->x & 0x3f;
	dshift = dbox->x & 0x3f;

	for (unsigned off = 0; off < sbox->width; off += (0x4000 - 0x40)) {
		unsigned soff, doff, w, p;

		soff = (sbox->x + off) & ~0x3f;
		doff = (dbox->x + off) & ~0x3f;

		w = MIN2(sbox->width - off, (0x4000 - 0x40));
		p = align(w, 64);

		debug_assert((soff + w) <= fd_bo_size(src->bo));
		debug_assert((doff + w) <= fd_bo_size(dst->bo));

		OUT_PKT7(ring, CP_SET_RENDER_MODE, 1);
		OUT_RING(ring, CP_SET_RENDER_MODE_0_MODE(BLIT2D));

		/*
		 * Emit source:
		 */
		OUT_PKT4(ring, REG_A5XX_RB_2D_SRC_INFO, 9);
		OUT_RING(ring, A5XX_RB_2D_SRC_INFO_COLOR_FORMAT(RB5_R8_UNORM) |
				A5XX_RB_2D_SRC_INFO_TILE_MODE(TILE5_LINEAR) |
				A5XX_RB_2D_SRC_INFO_COLOR_SWAP(WZYX));
		OUT_RELOC(ring, src->bo, soff, 0, 0);    /* RB_2D_SRC_LO/HI */
		OUT_RING(ring, A5XX_RB_2D_SRC_SIZE_PITCH(p) |
				A5XX_RB_2D_SRC_SIZE_ARRAY_PITCH(128));
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);

		OUT_PKT4(ring, REG_A5XX_GRAS_2D_SRC_INFO, 1);
		OUT_RING(ring, A5XX_GRAS_2D_SRC_INFO_COLOR_FORMAT(RB5_R8_UNORM) |
				A5XX_GRAS_2D_SRC_INFO_COLOR_SWAP(WZYX));

		/*
		 * Emit destination:
		 */
		OUT_PKT4(ring, REG_A5XX_RB_2D_DST_INFO, 9);
		OUT_RING(ring, A5XX_RB_2D_DST_INFO_COLOR_FORMAT(RB5_R8_UNORM) |
				A5XX_RB_2D_DST_INFO_TILE_MODE(TILE5_LINEAR) |
				A5XX_RB_2D_DST_INFO_COLOR_SWAP(WZYX));
		OUT_RELOC(ring, dst->bo, doff, 0, 0);   /* RB_2D_DST_LO/HI */
		OUT_RING(ring, A5XX_RB_2D_DST_SIZE_PITCH(p) |
				A5XX_RB_2D_DST_SIZE_ARRAY_PITCH(128));
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);

		OUT_PKT4(ring, REG_A5XX_GRAS_2D_DST_INFO, 1);
		OUT_RING(ring, A5XX_GRAS_2D_DST_INFO_COLOR_FORMAT(RB5_R8_UNORM) |
				A5XX_GRAS_2D_DST_INFO_COLOR_SWAP(WZYX));

		/*
		 * Blit command:
		 */
		OUT_PKT7(ring, CP_BLIT, 5);
		OUT_RING(ring, CP_BLIT_0_OP(BLIT_OP_COPY));
		OUT_RING(ring, CP_BLIT_1_SRC_X1(sshift) | CP_BLIT_1_SRC_Y1(0));
		OUT_RING(ring, CP_BLIT_2_SRC_X2(sshift+w-1) | CP_BLIT_2_SRC_Y2(0));
		OUT_RING(ring, CP_BLIT_3_DST_X1(dshift) | CP_BLIT_3_DST_Y1(0));
		OUT_RING(ring, CP_BLIT_4_DST_X2(dshift+w-1) | CP_BLIT_4_DST_Y2(0));

		OUT_PKT7(ring, CP_SET_RENDER_MODE, 1);
		OUT_RING(ring, CP_SET_RENDER_MODE_0_MODE(END2D));

		OUT_WFI5(ring);
	}
}

static void
emit_blit(struct fd_ringbuffer *ring, const struct pipe_blit_info *info)
{
	const struct pipe_box *sbox = &info->src.box;
	const struct pipe_box *dbox = &info->dst.box;
	struct fd_resource *src, *dst;
	struct fdl_slice *sslice, *dslice;
	enum a5xx_color_fmt sfmt, dfmt;
	enum a5xx_tile_mode stile, dtile;
	enum a3xx_color_swap sswap, dswap;
	unsigned ssize, dsize, spitch, dpitch;
	unsigned sx1, sy1, sx2, sy2;
	unsigned dx1, dy1, dx2, dy2;

	src = fd_resource(info->src.resource);
	dst = fd_resource(info->dst.resource);

	sslice = fd_resource_slice(src, info->src.level);
	dslice = fd_resource_slice(dst, info->dst.level);

	sfmt = fd5_pipe2color(info->src.format);
	dfmt = fd5_pipe2color(info->dst.format);

	stile = fd_resource_tile_mode(info->src.resource, info->src.level);
	dtile = fd_resource_tile_mode(info->dst.resource, info->dst.level);

	sswap = fd5_pipe2swap(info->src.format);
	dswap = fd5_pipe2swap(info->dst.format);

	spitch = fd_resource_pitch(src, info->src.level);
	dpitch = fd_resource_pitch(dst, info->dst.level);

	/* if dtile, then dswap ignored by hw, and likewise if stile then sswap
	 * ignored by hw.. but in this case we have already rejected the blit
	 * if src and dst formats differ, so juse use WZYX for both src and
	 * dst swap mode (so we don't change component order)
	 */
	if (stile || dtile) {
		debug_assert(info->src.format == info->dst.format);
		sswap = dswap = WZYX;
	}

	sx1 = sbox->x;
	sy1 = sbox->y;
	sx2 = sbox->x + sbox->width - 1;
	sy2 = sbox->y + sbox->height - 1;

	dx1 = dbox->x;
	dy1 = dbox->y;
	dx2 = dbox->x + dbox->width - 1;
	dy2 = dbox->y + dbox->height - 1;

	if (info->src.resource->target == PIPE_TEXTURE_3D)
		ssize = sslice->size0;
	else
		ssize = src->layout.layer_size;

	if (info->dst.resource->target == PIPE_TEXTURE_3D)
		dsize = dslice->size0;
	else
		dsize = dst->layout.layer_size;

	for (unsigned i = 0; i < info->dst.box.depth; i++) {
		unsigned soff = fd_resource_offset(src, info->src.level, sbox->z + i);
		unsigned doff = fd_resource_offset(dst, info->dst.level, dbox->z + i);

		debug_assert((soff + (sbox->height * spitch)) <= fd_bo_size(src->bo));
		debug_assert((doff + (dbox->height * dpitch)) <= fd_bo_size(dst->bo));

		OUT_PKT7(ring, CP_SET_RENDER_MODE, 1);
		OUT_RING(ring, CP_SET_RENDER_MODE_0_MODE(BLIT2D));

		/*
		 * Emit source:
		 */
		OUT_PKT4(ring, REG_A5XX_RB_2D_SRC_INFO, 9);
		OUT_RING(ring, A5XX_RB_2D_SRC_INFO_COLOR_FORMAT(sfmt) |
				A5XX_RB_2D_SRC_INFO_TILE_MODE(stile) |
				A5XX_RB_2D_SRC_INFO_COLOR_SWAP(sswap));
		OUT_RELOC(ring, src->bo, soff, 0, 0);    /* RB_2D_SRC_LO/HI */
		OUT_RING(ring, A5XX_RB_2D_SRC_SIZE_PITCH(spitch) |
				A5XX_RB_2D_SRC_SIZE_ARRAY_PITCH(ssize));
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);

		OUT_PKT4(ring, REG_A5XX_GRAS_2D_SRC_INFO, 1);
		OUT_RING(ring, A5XX_GRAS_2D_SRC_INFO_COLOR_FORMAT(sfmt) |
				A5XX_GRAS_2D_SRC_INFO_TILE_MODE(stile) |
				A5XX_GRAS_2D_SRC_INFO_COLOR_SWAP(sswap));

		/*
		 * Emit destination:
		 */
		OUT_PKT4(ring, REG_A5XX_RB_2D_DST_INFO, 9);
		OUT_RING(ring, A5XX_RB_2D_DST_INFO_COLOR_FORMAT(dfmt) |
				A5XX_RB_2D_DST_INFO_TILE_MODE(dtile) |
				A5XX_RB_2D_DST_INFO_COLOR_SWAP(dswap));
		OUT_RELOC(ring, dst->bo, doff, 0, 0);   /* RB_2D_DST_LO/HI */
		OUT_RING(ring, A5XX_RB_2D_DST_SIZE_PITCH(dpitch) |
				A5XX_RB_2D_DST_SIZE_ARRAY_PITCH(dsize));
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);
		OUT_RING(ring, 0x00000000);

		OUT_PKT4(ring, REG_A5XX_GRAS_2D_DST_INFO, 1);
		OUT_RING(ring, A5XX_GRAS_2D_DST_INFO_COLOR_FORMAT(dfmt) |
				A5XX_GRAS_2D_DST_INFO_TILE_MODE(dtile) |
				A5XX_GRAS_2D_DST_INFO_COLOR_SWAP(dswap));

		/*
		 * Blit command:
		 */
		OUT_PKT7(ring, CP_BLIT, 5);
		OUT_RING(ring, CP_BLIT_0_OP(BLIT_OP_COPY));
		OUT_RING(ring, CP_BLIT_1_SRC_X1(sx1) | CP_BLIT_1_SRC_Y1(sy1));
		OUT_RING(ring, CP_BLIT_2_SRC_X2(sx2) | CP_BLIT_2_SRC_Y2(sy2));
		OUT_RING(ring, CP_BLIT_3_DST_X1(dx1) | CP_BLIT_3_DST_Y1(dy1));
		OUT_RING(ring, CP_BLIT_4_DST_X2(dx2) | CP_BLIT_4_DST_Y2(dy2));

		OUT_PKT7(ring, CP_SET_RENDER_MODE, 1);
		OUT_RING(ring, CP_SET_RENDER_MODE_0_MODE(END2D));
	}
}

bool
fd5_blitter_blit(struct fd_context *ctx, const struct pipe_blit_info *info)
{
	struct fd_batch *batch;

	if (!can_do_blit(info)) {
		return false;
	}

	batch = fd_bc_alloc_batch(&ctx->screen->batch_cache, ctx, true);

	emit_setup(batch->draw);

	if ((info->src.resource->target == PIPE_BUFFER) &&
			(info->dst.resource->target == PIPE_BUFFER)) {
		assert(fd_resource(info->src.resource)->layout.tile_mode == TILE5_LINEAR);
		assert(fd_resource(info->dst.resource)->layout.tile_mode == TILE5_LINEAR);
		emit_blit_buffer(batch->draw, info);
	} else {
		/* I don't *think* we need to handle blits between buffer <-> !buffer */
		debug_assert(info->src.resource->target != PIPE_BUFFER);
		debug_assert(info->dst.resource->target != PIPE_BUFFER);
		emit_blit(batch->draw, info);
	}

	fd_resource(info->dst.resource)->valid = true;
	batch->needs_flush = true;

	fd_batch_flush(batch);
	fd_batch_reference(&batch, NULL);

	return true;
}

unsigned
fd5_tile_mode(const struct pipe_resource *tmpl)
{
	/* basically just has to be a format we can blit, so uploads/downloads
	 * via linear staging buffer works:
	 */
	if (ok_format(tmpl->format))
		return TILE5_3;

	return TILE5_LINEAR;
}
