/*
 * Copyright © 2016 Intel Corporation
 *
 * 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 "radv_meta.h"
#include "vk_format.h"

static VkExtent3D
meta_image_block_size(const struct radv_image *image)
{
	const struct vk_format_description *desc = vk_format_description(image->vk_format);
	return (VkExtent3D) { desc->block.width, desc->block.height, 1 };
}

/* Returns the user-provided VkBufferImageCopy::imageExtent in units of
 * elements rather than texels. One element equals one texel or one block
 * if Image is uncompressed or compressed, respectively.
 */
static struct VkExtent3D
meta_region_extent_el(const struct radv_image *image,
                      const struct VkExtent3D *extent)
{
	const VkExtent3D block = meta_image_block_size(image);
	return radv_sanitize_image_extent(image->type, (VkExtent3D) {
			.width  = DIV_ROUND_UP(extent->width , block.width),
				.height = DIV_ROUND_UP(extent->height, block.height),
				.depth  = DIV_ROUND_UP(extent->depth , block.depth),
				});
}

/* Returns the user-provided VkBufferImageCopy::imageOffset in units of
 * elements rather than texels. One element equals one texel or one block
 * if Image is uncompressed or compressed, respectively.
 */
static struct VkOffset3D
meta_region_offset_el(const struct radv_image *image,
                      const struct VkOffset3D *offset)
{
	const VkExtent3D block = meta_image_block_size(image);
	return radv_sanitize_image_offset(image->type, (VkOffset3D) {
			.x = offset->x / block.width,
				.y = offset->y / block.height,
				.z = offset->z / block.depth,
				});
}

static VkFormat
vk_format_for_size(int bs)
{
	switch (bs) {
	case 1: return VK_FORMAT_R8_UINT;
	case 2: return VK_FORMAT_R8G8_UINT;
	case 4: return VK_FORMAT_R8G8B8A8_UINT;
	case 8: return VK_FORMAT_R16G16B16A16_UINT;
	case 16: return VK_FORMAT_R32G32B32A32_UINT;
	default:
		unreachable("Invalid format block size");
	}
}

static struct radv_meta_blit2d_surf
blit_surf_for_image_level_layer(struct radv_image* image, VkImageAspectFlags aspectMask,
				int level, int layer)
{
	VkFormat format = image->vk_format;
	if (aspectMask & VK_IMAGE_ASPECT_DEPTH_BIT)
		format = vk_format_depth_only(format);
	else if (aspectMask & VK_IMAGE_ASPECT_STENCIL_BIT)
		format = vk_format_stencil_only(format);

	if (!image->surface.dcc_size)
		format = vk_format_for_size(vk_format_get_blocksize(format));

	return (struct radv_meta_blit2d_surf) {
		.format = format,
		.bs = vk_format_get_blocksize(format),
		.level = level,
		.layer = layer,
		.image = image,
		.aspect_mask = aspectMask,
	};
}

static void
meta_copy_buffer_to_image(struct radv_cmd_buffer *cmd_buffer,
                          struct radv_buffer* buffer,
                          struct radv_image* image,
                          uint32_t regionCount,
                          const VkBufferImageCopy* pRegions)
{
	struct radv_meta_saved_state saved_state;

	/* The Vulkan 1.0 spec says "dstImage must have a sample count equal to
	 * VK_SAMPLE_COUNT_1_BIT."
	 */
	assert(image->samples == 1);

	radv_meta_save_graphics_reset_vport_scissor(&saved_state, cmd_buffer);

	for (unsigned r = 0; r < regionCount; r++) {

		/**
		 * From the Vulkan 1.0.6 spec: 18.3 Copying Data Between Images
		 *    extent is the size in texels of the source image to copy in width,
		 *    height and depth. 1D images use only x and width. 2D images use x, y,
		 *    width and height. 3D images use x, y, z, width, height and depth.
		 *
		 *
		 * Also, convert the offsets and extent from units of texels to units of
		 * blocks - which is the highest resolution accessible in this command.
		 */
		const VkOffset3D img_offset_el =
			meta_region_offset_el(image, &pRegions[r].imageOffset);
		const VkExtent3D bufferExtent = {
			.width  = pRegions[r].bufferRowLength ?
			pRegions[r].bufferRowLength : pRegions[r].imageExtent.width,
			.height = pRegions[r].bufferImageHeight ?
			pRegions[r].bufferImageHeight : pRegions[r].imageExtent.height,
		};
		const VkExtent3D buf_extent_el =
			meta_region_extent_el(image, &bufferExtent);

		/* Start creating blit rect */
		const VkExtent3D img_extent_el =
			meta_region_extent_el(image, &pRegions[r].imageExtent);
		struct radv_meta_blit2d_rect rect = {
			.width = img_extent_el.width,
			.height =  img_extent_el.height,
		};

		/* Create blit surfaces */
		struct radv_meta_blit2d_surf img_bsurf =
			blit_surf_for_image_level_layer(image,
							pRegions[r].imageSubresource.aspectMask,
							pRegions[r].imageSubresource.mipLevel,
							pRegions[r].imageSubresource.baseArrayLayer);

		struct radv_meta_blit2d_buffer buf_bsurf = {
			.bs = img_bsurf.bs,
			.format = img_bsurf.format,
			.buffer = buffer,
			.offset = pRegions[r].bufferOffset,
			.pitch = buf_extent_el.width,
		};

		/* Loop through each 3D or array slice */
		unsigned num_slices_3d = img_extent_el.depth;
		unsigned num_slices_array = pRegions[r].imageSubresource.layerCount;
		unsigned slice_3d = 0;
		unsigned slice_array = 0;
		while (slice_3d < num_slices_3d && slice_array < num_slices_array) {

			rect.dst_x = img_offset_el.x;
			rect.dst_y = img_offset_el.y;


			/* Perform Blit */
			radv_meta_blit2d(cmd_buffer, NULL, &buf_bsurf, &img_bsurf, 1, &rect);

			/* Once we've done the blit, all of the actual information about
			 * the image is embedded in the command buffer so we can just
			 * increment the offset directly in the image effectively
			 * re-binding it to different backing memory.
			 */
			buf_bsurf.offset += buf_extent_el.width *
			                    buf_extent_el.height * buf_bsurf.bs;
			img_bsurf.layer++;
			if (image->type == VK_IMAGE_TYPE_3D)
				slice_3d++;
			else
				slice_array++;
		}
	}
	radv_meta_restore(&saved_state, cmd_buffer);
}

void radv_CmdCopyBufferToImage(
	VkCommandBuffer                             commandBuffer,
	VkBuffer                                    srcBuffer,
	VkImage                                     destImage,
	VkImageLayout                               destImageLayout,
	uint32_t                                    regionCount,
	const VkBufferImageCopy*                    pRegions)
{
	RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
	RADV_FROM_HANDLE(radv_image, dest_image, destImage);
	RADV_FROM_HANDLE(radv_buffer, src_buffer, srcBuffer);

	meta_copy_buffer_to_image(cmd_buffer, src_buffer, dest_image,
				  regionCount, pRegions);
}

static void
meta_copy_image_to_buffer(struct radv_cmd_buffer *cmd_buffer,
                          struct radv_buffer* buffer,
                          struct radv_image* image,
                          uint32_t regionCount,
                          const VkBufferImageCopy* pRegions)
{
	struct radv_meta_saved_compute_state saved_state;

	radv_meta_begin_bufimage(cmd_buffer, &saved_state);
	for (unsigned r = 0; r < regionCount; r++) {

		/**
		 * From the Vulkan 1.0.6 spec: 18.3 Copying Data Between Images
		 *    extent is the size in texels of the source image to copy in width,
		 *    height and depth. 1D images use only x and width. 2D images use x, y,
		 *    width and height. 3D images use x, y, z, width, height and depth.
		 *
		 *
		 * Also, convert the offsets and extent from units of texels to units of
		 * blocks - which is the highest resolution accessible in this command.
		 */
		const VkOffset3D img_offset_el =
			meta_region_offset_el(image, &pRegions[r].imageOffset);
		const VkExtent3D bufferExtent = {
			.width  = pRegions[r].bufferRowLength ?
			pRegions[r].bufferRowLength : pRegions[r].imageExtent.width,
			.height = pRegions[r].bufferImageHeight ?
			pRegions[r].bufferImageHeight : pRegions[r].imageExtent.height,
		};
		const VkExtent3D buf_extent_el =
			meta_region_extent_el(image, &bufferExtent);

		/* Start creating blit rect */
		const VkExtent3D img_extent_el =
			meta_region_extent_el(image, &pRegions[r].imageExtent);
		struct radv_meta_blit2d_rect rect = {
			.width = img_extent_el.width,
			.height =  img_extent_el.height,
		};

		/* Create blit surfaces */
		struct radv_meta_blit2d_surf img_info =
			blit_surf_for_image_level_layer(image,
							pRegions[r].imageSubresource.aspectMask,
							pRegions[r].imageSubresource.mipLevel,
							pRegions[r].imageSubresource.baseArrayLayer);
		struct radv_meta_blit2d_buffer buf_info = {
			.bs = img_info.bs,
			.format = img_info.format,
			.buffer = buffer,
			.offset = pRegions[r].bufferOffset,
			.pitch = buf_extent_el.width,
		};

		/* Loop through each 3D or array slice */
		unsigned num_slices_3d = img_extent_el.depth;
		unsigned num_slices_array = pRegions[r].imageSubresource.layerCount;
		unsigned slice_3d = 0;
		unsigned slice_array = 0;
		while (slice_3d < num_slices_3d && slice_array < num_slices_array) {

			rect.src_x = img_offset_el.x;
			rect.src_y = img_offset_el.y;


			/* Perform Blit */
			radv_meta_image_to_buffer(cmd_buffer, &img_info, &buf_info, 1, &rect);

			buf_info.offset += buf_extent_el.width *
			                    buf_extent_el.height * buf_info.bs;
			img_info.layer++;
			if (image->type == VK_IMAGE_TYPE_3D)
				slice_3d++;
			else
				slice_array++;
		}
	}
	radv_meta_end_bufimage(cmd_buffer, &saved_state);
}

void radv_CmdCopyImageToBuffer(
	VkCommandBuffer                             commandBuffer,
	VkImage                                     srcImage,
	VkImageLayout                               srcImageLayout,
	VkBuffer                                    destBuffer,
	uint32_t                                    regionCount,
	const VkBufferImageCopy*                    pRegions)
{
	RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
	RADV_FROM_HANDLE(radv_image, src_image, srcImage);
	RADV_FROM_HANDLE(radv_buffer, dst_buffer, destBuffer);

	meta_copy_image_to_buffer(cmd_buffer, dst_buffer, src_image,
				  regionCount, pRegions);
}

void radv_CmdCopyImage(
	VkCommandBuffer                             commandBuffer,
	VkImage                                     srcImage,
	VkImageLayout                               srcImageLayout,
	VkImage                                     destImage,
	VkImageLayout                               destImageLayout,
	uint32_t                                    regionCount,
	const VkImageCopy*                          pRegions)
{
	RADV_FROM_HANDLE(radv_cmd_buffer, cmd_buffer, commandBuffer);
	RADV_FROM_HANDLE(radv_image, src_image, srcImage);
	RADV_FROM_HANDLE(radv_image, dest_image, destImage);
	struct radv_meta_saved_state saved_state;

	/* From the Vulkan 1.0 spec:
	 *
	 *    vkCmdCopyImage can be used to copy image data between multisample
	 *    images, but both images must have the same number of samples.
	 */
	assert(src_image->samples == dest_image->samples);

	radv_meta_save_graphics_reset_vport_scissor(&saved_state, cmd_buffer);

	for (unsigned r = 0; r < regionCount; r++) {
		assert(pRegions[r].srcSubresource.aspectMask ==
		       pRegions[r].dstSubresource.aspectMask);

		/* Create blit surfaces */
		struct radv_meta_blit2d_surf b_src =
			blit_surf_for_image_level_layer(src_image,
							pRegions[r].srcSubresource.aspectMask,
							pRegions[r].srcSubresource.mipLevel,
							pRegions[r].srcSubresource.baseArrayLayer);
		struct radv_meta_blit2d_surf b_dst =
			blit_surf_for_image_level_layer(dest_image,
							pRegions[r].dstSubresource.aspectMask,
							pRegions[r].dstSubresource.mipLevel,
							pRegions[r].dstSubresource.baseArrayLayer);

		/* for DCC */
		b_src.format = b_dst.format;

		/**
		 * From the Vulkan 1.0.6 spec: 18.4 Copying Data Between Buffers and Images
		 *    imageExtent is the size in texels of the image to copy in width, height
		 *    and depth. 1D images use only x and width. 2D images use x, y, width
		 *    and height. 3D images use x, y, z, width, height and depth.
		 *
		 * Also, convert the offsets and extent from units of texels to units of
		 * blocks - which is the highest resolution accessible in this command.
		 */
		const VkOffset3D dst_offset_el =
			meta_region_offset_el(dest_image, &pRegions[r].dstOffset);
		const VkOffset3D src_offset_el =
			meta_region_offset_el(src_image, &pRegions[r].srcOffset);
		const VkExtent3D img_extent_el =
			meta_region_extent_el(src_image, &pRegions[r].extent);

		/* Start creating blit rect */
		struct radv_meta_blit2d_rect rect = {
			.width = img_extent_el.width,
			.height = img_extent_el.height,
		};

		/* Loop through each 3D or array slice */
		unsigned num_slices_3d = img_extent_el.depth;
		unsigned num_slices_array = pRegions[r].dstSubresource.layerCount;
		unsigned slice_3d = 0;
		unsigned slice_array = 0;
		while (slice_3d < num_slices_3d && slice_array < num_slices_array) {

			/* Finish creating blit rect */
			rect.dst_x = dst_offset_el.x;
			rect.dst_y = dst_offset_el.y;
			rect.src_x = src_offset_el.x;
			rect.src_y = src_offset_el.y;

			/* Perform Blit */
			radv_meta_blit2d(cmd_buffer, &b_src, NULL, &b_dst, 1, &rect);

			b_src.layer++;
			b_dst.layer++;
			if (dest_image->type == VK_IMAGE_TYPE_3D)
				slice_3d++;
			else
				slice_array++;
		}
	}

	radv_meta_restore(&saved_state, cmd_buffer);
}