/*
 * 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 <assert.h>
#include <stdbool.h>

#include "radv_meta.h"
#include "radv_private.h"
#include "nir/nir_builder.h"
#include "sid.h"
/**
 * Vertex attributes used by all pipelines.
 */
struct vertex_attrs {
	float position[2]; /**< 3DPRIM_RECTLIST */
};

/* passthrough vertex shader */
static nir_shader *
build_nir_vs(void)
{
	const struct glsl_type *vec4 = glsl_vec4_type();

	nir_builder b;
	nir_variable *a_position;
	nir_variable *v_position;

	nir_builder_init_simple_shader(&b, NULL, MESA_SHADER_VERTEX, NULL);
	b.shader->info.name = ralloc_strdup(b.shader, "meta_depth_decomp_vs");

	a_position = nir_variable_create(b.shader, nir_var_shader_in, vec4,
					 "a_position");
	a_position->data.location = VERT_ATTRIB_GENERIC0;

	v_position = nir_variable_create(b.shader, nir_var_shader_out, vec4,
					 "gl_Position");
	v_position->data.location = VARYING_SLOT_POS;

	nir_copy_var(&b, v_position, a_position);

	return b.shader;
}

/* simple passthrough shader */
static nir_shader *
build_nir_fs(void)
{
	nir_builder b;

	nir_builder_init_simple_shader(&b, NULL, MESA_SHADER_FRAGMENT, NULL);
	b.shader->info.name = ralloc_asprintf(b.shader,
					      "meta_depth_decomp_noop_fs");

	return b.shader;
}

static VkResult
create_pass(struct radv_device *device)
{
	VkResult result;
	VkDevice device_h = radv_device_to_handle(device);
	const VkAllocationCallbacks *alloc = &device->meta_state.alloc;
	VkAttachmentDescription attachment;

	attachment.format = VK_FORMAT_UNDEFINED;
	attachment.samples = 1;
	attachment.loadOp = VK_ATTACHMENT_LOAD_OP_LOAD;
	attachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
	attachment.initialLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
	attachment.finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;

	result = radv_CreateRenderPass(device_h,
				       &(VkRenderPassCreateInfo) {
					       .sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
						       .attachmentCount = 1,
						       .pAttachments = &attachment,
						       .subpassCount = 1,
							.pSubpasses = &(VkSubpassDescription) {
						       .pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS,
						       .inputAttachmentCount = 0,
						       .colorAttachmentCount = 0,
						       .pColorAttachments = NULL,
						       .pResolveAttachments = NULL,
						       .pDepthStencilAttachment = &(VkAttachmentReference) {
							       .attachment = 0,
							       .layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL,
						       },
						       .preserveAttachmentCount = 0,
						       .pPreserveAttachments = NULL,
					       },
								.dependencyCount = 0,
								   },
				       alloc,
				       &device->meta_state.depth_decomp.pass);

	return result;
}

static VkResult
create_pipeline(struct radv_device *device,
                VkShaderModule vs_module_h)
{
	VkResult result;
	VkDevice device_h = radv_device_to_handle(device);

	struct radv_shader_module fs_module = {
		.nir = build_nir_fs(),
	};

	if (!fs_module.nir) {
		/* XXX: Need more accurate error */
		result = VK_ERROR_OUT_OF_HOST_MEMORY;
		goto cleanup;
	}

	const VkGraphicsPipelineCreateInfo pipeline_create_info = {
		.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
		.stageCount = 2,
		.pStages = (VkPipelineShaderStageCreateInfo[]) {
		       {
				.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
				.stage = VK_SHADER_STAGE_VERTEX_BIT,
				.module = vs_module_h,
				.pName = "main",
			},
			{
				.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
				.stage = VK_SHADER_STAGE_FRAGMENT_BIT,
				.module = radv_shader_module_to_handle(&fs_module),
				.pName = "main",
			},
		},
		.pVertexInputState = &(VkPipelineVertexInputStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
			.vertexBindingDescriptionCount = 1,
			.pVertexBindingDescriptions = (VkVertexInputBindingDescription[]) {
				{
					.binding = 0,
					.stride = sizeof(struct vertex_attrs),
					.inputRate = VK_VERTEX_INPUT_RATE_VERTEX
				},
			},
			.vertexAttributeDescriptionCount = 1,
			.pVertexAttributeDescriptions = (VkVertexInputAttributeDescription[]) {
				{
					/* Position */
					.location = 0,
					.binding = 0,
					.format = VK_FORMAT_R32G32_SFLOAT,
					.offset = offsetof(struct vertex_attrs, position),
				},
			},
		},
		.pInputAssemblyState = &(VkPipelineInputAssemblyStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,
			.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP,
			.primitiveRestartEnable = false,
		},
		.pViewportState = &(VkPipelineViewportStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
			.viewportCount = 0,
			.scissorCount = 0,
		},
		.pRasterizationState = &(VkPipelineRasterizationStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
			.depthClampEnable = false,
			.rasterizerDiscardEnable = false,
			.polygonMode = VK_POLYGON_MODE_FILL,
			.cullMode = VK_CULL_MODE_NONE,
			.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE,
		},
		.pMultisampleState = &(VkPipelineMultisampleStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
			.rasterizationSamples = 1,
			.sampleShadingEnable = false,
			.pSampleMask = NULL,
			.alphaToCoverageEnable = false,
			.alphaToOneEnable = false,
		},
		.pColorBlendState = &(VkPipelineColorBlendStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
			.logicOpEnable = false,
			.attachmentCount = 0,
			.pAttachments = NULL,
		},
		.pDepthStencilState = &(VkPipelineDepthStencilStateCreateInfo) {
			.sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,
			.depthTestEnable = false,
			.depthWriteEnable = false,
			.depthBoundsTestEnable = false,
			.stencilTestEnable = false,
		},
		.pDynamicState = NULL,
		.renderPass = device->meta_state.depth_decomp.pass,
		.subpass = 0,
	};

	result = radv_graphics_pipeline_create(device_h,
					       radv_pipeline_cache_to_handle(&device->meta_state.cache),
					       &pipeline_create_info,
					       &(struct radv_graphics_pipeline_create_info) {
							.use_rectlist = true,
							.db_flush_depth_inplace = true,
							.db_flush_stencil_inplace = true,
					       },
					       &device->meta_state.alloc,
					       &device->meta_state.depth_decomp.decompress_pipeline);
	if (result != VK_SUCCESS)
		goto cleanup;

	result = radv_graphics_pipeline_create(device_h,
					       radv_pipeline_cache_to_handle(&device->meta_state.cache),
					       &pipeline_create_info,
					       &(struct radv_graphics_pipeline_create_info) {
							.use_rectlist = true,
							.db_flush_depth_inplace = true,
							.db_flush_stencil_inplace = true,
							.db_resummarize = true,
					       },
					       &device->meta_state.alloc,
					       &device->meta_state.depth_decomp.resummarize_pipeline);
	if (result != VK_SUCCESS)
		goto cleanup;

	goto cleanup;

cleanup:
	ralloc_free(fs_module.nir);
	return result;
}

void
radv_device_finish_meta_depth_decomp_state(struct radv_device *device)
{
	struct radv_meta_state *state = &device->meta_state;
	VkDevice device_h = radv_device_to_handle(device);
	VkRenderPass pass_h = device->meta_state.depth_decomp.pass;
	const VkAllocationCallbacks *alloc = &device->meta_state.alloc;

	if (pass_h)
		radv_DestroyRenderPass(device_h, pass_h,
					     &device->meta_state.alloc);

	VkPipeline pipeline_h = state->depth_decomp.decompress_pipeline;
	if (pipeline_h) {
		radv_DestroyPipeline(device_h, pipeline_h, alloc);
	}
	pipeline_h = state->depth_decomp.resummarize_pipeline;
	if (pipeline_h) {
		radv_DestroyPipeline(device_h, pipeline_h, alloc);
	}
}

VkResult
radv_device_init_meta_depth_decomp_state(struct radv_device *device)
{
	VkResult res = VK_SUCCESS;

	zero(device->meta_state.depth_decomp);

	struct radv_shader_module vs_module = { .nir = build_nir_vs() };
	if (!vs_module.nir) {
		/* XXX: Need more accurate error */
		res = VK_ERROR_OUT_OF_HOST_MEMORY;
		goto fail;
	}

	res = create_pass(device);
	if (res != VK_SUCCESS)
		goto fail;

	VkShaderModule vs_module_h = radv_shader_module_to_handle(&vs_module);
	res = create_pipeline(device, vs_module_h);
	if (res != VK_SUCCESS)
		goto fail;

	goto cleanup;

fail:
	radv_device_finish_meta_depth_decomp_state(device);

cleanup:
	ralloc_free(vs_module.nir);

	return res;
}

static void
emit_depth_decomp(struct radv_cmd_buffer *cmd_buffer,
		  const VkOffset2D *dest_offset,
		  const VkExtent2D *depth_decomp_extent,
		  VkPipeline pipeline_h)
{
	struct radv_device *device = cmd_buffer->device;
	VkCommandBuffer cmd_buffer_h = radv_cmd_buffer_to_handle(cmd_buffer);
	uint32_t offset;
	const struct vertex_attrs vertex_data[3] = {
		{
			.position = {
				dest_offset->x,
				dest_offset->y,
			},
		},
		{
			.position = {
				dest_offset->x,
				dest_offset->y + depth_decomp_extent->height,
			},
		},
		{
			.position = {
				dest_offset->x + depth_decomp_extent->width,
				dest_offset->y,
			},
		},
	};

	radv_cmd_buffer_upload_data(cmd_buffer, sizeof(vertex_data), 16, vertex_data, &offset);
	struct radv_buffer vertex_buffer = {
		.device = device,
		.size = sizeof(vertex_data),
		.bo = cmd_buffer->upload.upload_bo,
		.offset = offset,
	};

	VkBuffer vertex_buffer_h = radv_buffer_to_handle(&vertex_buffer);

	radv_CmdBindVertexBuffers(cmd_buffer_h,
				  /*firstBinding*/ 0,
				  /*bindingCount*/ 1,
				  (VkBuffer[]) { vertex_buffer_h },
				  (VkDeviceSize[]) { 0 });

	RADV_FROM_HANDLE(radv_pipeline, pipeline, pipeline_h);

	if (cmd_buffer->state.pipeline != pipeline) {
		radv_CmdBindPipeline(cmd_buffer_h, VK_PIPELINE_BIND_POINT_GRAPHICS,
				     pipeline_h);
	}

	radv_CmdDraw(cmd_buffer_h, 3, 1, 0, 0);
}


static void radv_process_depth_image_inplace(struct radv_cmd_buffer *cmd_buffer,
					     struct radv_image *image,
					     VkImageSubresourceRange *subresourceRange,
					     VkPipeline pipeline_h)
{
	struct radv_meta_saved_state saved_state;
	struct radv_meta_saved_pass_state saved_pass_state;
	VkDevice device_h = radv_device_to_handle(cmd_buffer->device);
	VkCommandBuffer cmd_buffer_h = radv_cmd_buffer_to_handle(cmd_buffer);
	uint32_t width = radv_minify(image->extent.width,
				     subresourceRange->baseMipLevel);
	uint32_t height = radv_minify(image->extent.height,
				     subresourceRange->baseMipLevel);

	if (!image->htile.size)
		return;
	radv_meta_save_pass(&saved_pass_state, cmd_buffer);

	radv_meta_save_graphics_reset_vport_scissor(&saved_state, cmd_buffer);

	for (uint32_t layer = 0; layer < subresourceRange->layerCount; layer++) {
		struct radv_image_view iview;

		radv_image_view_init(&iview, cmd_buffer->device,
				     &(VkImageViewCreateInfo) {
					     .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
					     .image = radv_image_to_handle(image),
					     .format = image->vk_format,
					     .subresourceRange = {
						     .aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT,
						     .baseMipLevel = subresourceRange->baseMipLevel,
						     .levelCount = 1,
						     .baseArrayLayer = subresourceRange->baseArrayLayer + layer,
						     .layerCount = 1,
					     },
				     },
				     cmd_buffer, VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT);


		VkFramebuffer fb_h;
		radv_CreateFramebuffer(device_h,
				       &(VkFramebufferCreateInfo) {
					       .sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
					       .attachmentCount = 1,
						       .pAttachments = (VkImageView[]) {
						       radv_image_view_to_handle(&iview)
					       },
					       .width = width,
						.height = height,
					       .layers = 1
				       },
				       &cmd_buffer->pool->alloc,
				       &fb_h);

		radv_CmdBeginRenderPass(cmd_buffer_h,
					      &(VkRenderPassBeginInfo) {
						      .sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,
							      .renderPass = cmd_buffer->device->meta_state.depth_decomp.pass,
							      .framebuffer = fb_h,
							      .renderArea = {
							      .offset = {
								      0,
								      0,
							      },
							      .extent = {
								      width,
								      height,
							      }
						       },
						       .clearValueCount = 0,
						       .pClearValues = NULL,
					   },
					   VK_SUBPASS_CONTENTS_INLINE);

		emit_depth_decomp(cmd_buffer, &(VkOffset2D){0, 0 }, &(VkExtent2D){width, height}, pipeline_h);
		radv_CmdEndRenderPass(cmd_buffer_h);

		radv_DestroyFramebuffer(device_h, fb_h,
					&cmd_buffer->pool->alloc);
	}
	radv_meta_restore(&saved_state, cmd_buffer);
	radv_meta_restore_pass(&saved_pass_state, cmd_buffer);
}

void radv_decompress_depth_image_inplace(struct radv_cmd_buffer *cmd_buffer,
					 struct radv_image *image,
					 VkImageSubresourceRange *subresourceRange)
{
	radv_process_depth_image_inplace(cmd_buffer, image, subresourceRange,
					 cmd_buffer->device->meta_state.depth_decomp.decompress_pipeline);
}

void radv_resummarize_depth_image_inplace(struct radv_cmd_buffer *cmd_buffer,
					 struct radv_image *image,
					 VkImageSubresourceRange *subresourceRange)
{
	radv_process_depth_image_inplace(cmd_buffer, image, subresourceRange,
					 cmd_buffer->device->meta_state.depth_decomp.resummarize_pipeline);
}
