monado/src/xrt/compositor/render/render_gfx.c

// Copyright 2019-2022, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  The NEW compositor rendering code header.
 * @author Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @ingroup comp_render
 */

#include "render/render_interfaces.h"

#include <stdio.h>


/*
 *
 * Common helpers
 *
 */

#define C(c)                                                                                                           \
	do {                                                                                                           \
		VkResult ret = c;                                                                                      \
		if (ret != VK_SUCCESS) {                                                                               \
			return false;                                                                                  \
		}                                                                                                      \
	} while (false)

#define D(TYPE, thing)                                                                                                 \
	if (thing != VK_NULL_HANDLE) {                                                                                 \
		vk->vkDestroy##TYPE(vk->device, thing, NULL);                                                          \
		thing = VK_NULL_HANDLE;                                                                                \
	}

#define DD(pool, thing)                                                                                                \
	if (thing != VK_NULL_HANDLE) {                                                                                 \
		free_descriptor_set(vk, pool, thing);                                                                  \
		thing = VK_NULL_HANDLE;                                                                                \
	}

/*!
 * Get the @ref vk_bundle from @ref render_gfx_target_resources.
 */
static inline struct vk_bundle *
vk_from_rtr(struct render_gfx_target_resources *rtr)
{
	return rtr->r->vk;
}

/*!
 * Get the @ref vk_bundle from @ref render_gfx.
 */
static inline struct vk_bundle *
vk_from_rr(struct render_gfx *rr)
{
	return rr->r->vk;
}

static VkResult
create_external_render_pass(struct vk_bundle *vk, VkFormat format, VkRenderPass *out_render_pass)
{
	VkResult ret;

	VkAttachmentDescription attachments[1] = {
	    {
	        .format = format,
	        .samples = VK_SAMPLE_COUNT_1_BIT,
	        .loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR,
	        .storeOp = VK_ATTACHMENT_STORE_OP_STORE,
	        .stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE,
	        .stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE,
	        .initialLayout = VK_IMAGE_LAYOUT_UNDEFINED,
	        .finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,
	    },
	};

	VkAttachmentReference color_reference = {
	    .attachment = 0,
	    .layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
	};

	VkSubpassDescription subpasses[1] = {
	    {
	        .pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS,
	        .inputAttachmentCount = 0,
	        .pInputAttachments = NULL,
	        .colorAttachmentCount = 1,
	        .pColorAttachments = &color_reference,
	        .pResolveAttachments = NULL,
	        .pDepthStencilAttachment = NULL,
	        .preserveAttachmentCount = 0,
	        .pPreserveAttachments = NULL,
	    },
	};

	VkSubpassDependency dependencies[1] = {
	    {
	        .srcSubpass = VK_SUBPASS_EXTERNAL,
	        .dstSubpass = 0,
	        .srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT,
	        .dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT,
	        .srcAccessMask = 0,
	        .dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,
	    },
	};

	VkRenderPassCreateInfo render_pass_info = {
	    .sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
	    .attachmentCount = ARRAY_SIZE(attachments),
	    .pAttachments = attachments,
	    .subpassCount = ARRAY_SIZE(subpasses),
	    .pSubpasses = subpasses,
	    .dependencyCount = ARRAY_SIZE(dependencies),
	    .pDependencies = dependencies,
	};

	VkRenderPass render_pass = VK_NULL_HANDLE;
	ret = vk->vkCreateRenderPass(vk->device,        //
	                             &render_pass_info, //
	                             NULL,              //
	                             &render_pass);     //
	if (ret != VK_SUCCESS) {
		VK_ERROR(vk, "vkCreateRenderPass failed: %s", vk_result_string(ret));
		return ret;
	}

	*out_render_pass = render_pass;

	return VK_SUCCESS;
}

static VkResult
create_framebuffer(struct vk_bundle *vk,
                   VkImageView image_view,
                   VkRenderPass render_pass,
                   uint32_t width,
                   uint32_t height,
                   VkFramebuffer *out_external_framebuffer)
{
	VkResult ret;

	VkImageView attachments[1] = {image_view};

	VkFramebufferCreateInfo frame_buffer_info = {
	    .sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
	    .renderPass = render_pass,
	    .attachmentCount = ARRAY_SIZE(attachments),
	    .pAttachments = attachments,
	    .width = width,
	    .height = height,
	    .layers = 1,
	};

	VkFramebuffer framebuffer = VK_NULL_HANDLE;
	ret = vk->vkCreateFramebuffer(vk->device,         //
	                              &frame_buffer_info, //
	                              NULL,               //
	                              &framebuffer);      //
	if (ret != VK_SUCCESS) {
		VK_ERROR(vk, "vkCreateFramebuffer failed: %s", vk_result_string(ret));
		return ret;
	}

	*out_external_framebuffer = framebuffer;

	return VK_SUCCESS;
}

static void
begin_render_pass(struct vk_bundle *vk,
                  VkCommandBuffer command_buffer,
                  VkRenderPass render_pass,
                  VkFramebuffer framebuffer,
                  uint32_t width,
                  uint32_t height)
{
	VkClearValue clear_color[1] = {{
	    .color = {.float32 = {0.0f, 0.0f, 0.0f, 0.0f}},
	}};

	VkRenderPassBeginInfo render_pass_begin_info = {
	    .sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,
	    .renderPass = render_pass,
	    .framebuffer = framebuffer,
	    .renderArea =
	        {
	            .offset =
	                {
	                    .x = 0,
	                    .y = 0,
	                },
	            .extent =
	                {
	                    .width = width,
	                    .height = height,
	                },
	        },
	    .clearValueCount = ARRAY_SIZE(clear_color),
	    .pClearValues = clear_color,
	};

	vk->vkCmdBeginRenderPass(command_buffer, &render_pass_begin_info, VK_SUBPASS_CONTENTS_INLINE);
}


/*
 *
 * Mesh
 *
 */

static VkResult
create_mesh_pipeline(struct vk_bundle *vk,
                     VkRenderPass render_pass,
                     VkPipelineLayout pipeline_layout,
                     VkPipelineCache pipeline_cache,
                     uint32_t src_binding,
                     uint32_t mesh_index_count_total,
                     uint32_t mesh_stride,
                     VkShaderModule mesh_vert,
                     VkShaderModule mesh_frag,
                     VkPipeline *out_mesh_pipeline)
{
	VkResult ret;

	// Might be changed to line for debugging.
	VkPolygonMode polygonMode = VK_POLYGON_MODE_FILL;

	// Do we use triangle strips or triangles with indices.
	VkPrimitiveTopology topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
	if (mesh_index_count_total > 0) {
		topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP;
	}

	VkPipelineInputAssemblyStateCreateInfo input_assembly_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,
	    .topology = topology,
	    .primitiveRestartEnable = VK_FALSE,
	};

	VkPipelineRasterizationStateCreateInfo rasterization_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
	    .depthClampEnable = VK_FALSE,
	    .rasterizerDiscardEnable = VK_FALSE,
	    .polygonMode = polygonMode,
	    .cullMode = VK_CULL_MODE_BACK_BIT,
	    .frontFace = VK_FRONT_FACE_CLOCKWISE,
	    .lineWidth = 1.0f,
	};

	VkPipelineColorBlendAttachmentState blend_attachment_state = {
	    .blendEnable = VK_FALSE,
	    .colorWriteMask = 0xf,
	};

	VkPipelineColorBlendStateCreateInfo color_blend_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
	    .attachmentCount = 1,
	    .pAttachments = &blend_attachment_state,
	};

	VkPipelineDepthStencilStateCreateInfo depth_stencil_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,
	    .depthTestEnable = VK_TRUE,
	    .depthWriteEnable = VK_TRUE,
	    .depthCompareOp = VK_COMPARE_OP_LESS_OR_EQUAL,
	    .front =
	        {
	            .compareOp = VK_COMPARE_OP_ALWAYS,
	        },
	    .back =
	        {
	            .compareOp = VK_COMPARE_OP_ALWAYS,
	        },
	};

	VkPipelineViewportStateCreateInfo viewport_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
	    .viewportCount = 1,
	    .scissorCount = 1,
	};

	VkPipelineMultisampleStateCreateInfo multisample_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
	    .rasterizationSamples = VK_SAMPLE_COUNT_1_BIT,
	};

	VkDynamicState dynamic_states[] = {
	    VK_DYNAMIC_STATE_VIEWPORT,
	    VK_DYNAMIC_STATE_SCISSOR,
	};

	VkPipelineDynamicStateCreateInfo dynamic_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO,
	    .dynamicStateCount = ARRAY_SIZE(dynamic_states),
	    .pDynamicStates = dynamic_states,
	};

	// clang-format off
	VkVertexInputAttributeDescription vertex_input_attribute_descriptions[2] = {
	    {
	        .binding = src_binding,
	        .location = 0,
	        .format = VK_FORMAT_R32G32B32A32_SFLOAT,
	        .offset = 0,
	    },
	    {
	        .binding = src_binding,
	        .location = 1,
	        .format = VK_FORMAT_R32G32B32A32_SFLOAT,
	        .offset = 16,
	    },
	};

	VkVertexInputBindingDescription vertex_input_binding_description[1] = {
	    {
	        .binding = src_binding,
	        .inputRate = VK_VERTEX_INPUT_RATE_VERTEX,
	        .stride = mesh_stride,
	    },
	};

	VkPipelineVertexInputStateCreateInfo vertex_input_state = {
	    .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
	    .vertexAttributeDescriptionCount = ARRAY_SIZE(vertex_input_attribute_descriptions),
	    .pVertexAttributeDescriptions = vertex_input_attribute_descriptions,
	    .vertexBindingDescriptionCount = ARRAY_SIZE(vertex_input_binding_description),
	    .pVertexBindingDescriptions = vertex_input_binding_description,
	};
	// clang-format on

	VkPipelineShaderStageCreateInfo shader_stages[2] = {
	    {
	        .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
	        .stage = VK_SHADER_STAGE_VERTEX_BIT,
	        .module = mesh_vert,
	        .pName = "main",
	    },
	    {
	        .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
	        .stage = VK_SHADER_STAGE_FRAGMENT_BIT,
	        .module = mesh_frag,
	        .pName = "main",
	    },
	};

	VkGraphicsPipelineCreateInfo pipeline_info = {
	    .sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
	    .stageCount = ARRAY_SIZE(shader_stages),
	    .pStages = shader_stages,
	    .pVertexInputState = &vertex_input_state,
	    .pInputAssemblyState = &input_assembly_state,
	    .pViewportState = &viewport_state,
	    .pRasterizationState = &rasterization_state,
	    .pMultisampleState = &multisample_state,
	    .pDepthStencilState = &depth_stencil_state,
	    .pColorBlendState = &color_blend_state,
	    .pDynamicState = &dynamic_state,
	    .layout = pipeline_layout,
	    .renderPass = render_pass,
	    .basePipelineHandle = VK_NULL_HANDLE,
	    .basePipelineIndex = -1,
	};

	VkPipeline pipeline = VK_NULL_HANDLE;
	ret = vk->vkCreateGraphicsPipelines(vk->device,     //
	                                    pipeline_cache, //
	                                    1,              //
	                                    &pipeline_info, //
	                                    NULL,           //
	                                    &pipeline);     //
	if (ret != VK_SUCCESS) {
		VK_DEBUG(vk, "vkCreateGraphicsPipelines failed: %s", vk_result_string(ret));
		return ret;
	}

	*out_mesh_pipeline = pipeline;

	return VK_SUCCESS;
}

static void
update_mesh_discriptor_set(struct vk_bundle *vk,
                           uint32_t src_binding,
                           VkSampler sampler,
                           VkImageView image_view,
                           uint32_t ubo_binding,
                           VkBuffer buffer,
                           VkDeviceSize size,
                           VkDescriptorSet descriptor_set)
{
	VkDescriptorImageInfo image_info = {
	    .sampler = sampler,
	    .imageView = image_view,
	    .imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
	};

	VkDescriptorBufferInfo buffer_info = {
	    .buffer = buffer,
	    .offset = 0,
	    .range = size,
	};

	VkWriteDescriptorSet write_descriptor_sets[2] = {
	    {
	        .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
	        .dstSet = descriptor_set,
	        .dstBinding = src_binding,
	        .descriptorCount = 1,
	        .descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
	        .pImageInfo = &image_info,
	    },
	    {
	        .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
	        .dstSet = descriptor_set,
	        .dstBinding = ubo_binding,
	        .descriptorCount = 1,
	        .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
	        .pBufferInfo = &buffer_info,
	    },
	};

	vk->vkUpdateDescriptorSets(vk->device,                        //
	                           ARRAY_SIZE(write_descriptor_sets), // descriptorWriteCount
	                           write_descriptor_sets,             // pDescriptorWrites
	                           0,                                 // descriptorCopyCount
	                           NULL);                             // pDescriptorCopies
}


/*
 *
 * 'Exported' target resourecs functions.
 *
 */

bool
render_gfx_target_resources_init(struct render_gfx_target_resources *rtr,
                                 struct render_resources *r,
                                 VkImageView target,
                                 struct render_gfx_target_data *data)
{
	struct vk_bundle *vk = r->vk;
	rtr->r = r;

	assert(data->is_external);

	rtr->data = *data;

	C(create_external_render_pass( //
	    vk,                        // vk_bundle
	    data->format,              // target_format
	    &rtr->render_pass));       // out_render_pass

	C(create_mesh_pipeline(vk,                        // vk_bundle
	                       rtr->render_pass,          // render_pass
	                       r->mesh.pipeline_layout,   // pipeline_layout
	                       r->pipeline_cache,         // pipeline_cache
	                       r->mesh.src_binding,       // src_binding
	                       r->mesh.index_count_total, // mesh_index_count_total
	                       r->mesh.stride,            // mesh_stride
	                       r->shaders->mesh_vert,     // mesh_vert
	                       r->shaders->mesh_frag,     // mesh_frag
	                       &rtr->mesh.pipeline));     // out_mesh_pipeline

	C(create_framebuffer(vk,                  // vk_bundle,
	                     target,              // image_view,
	                     rtr->render_pass,    // render_pass,
	                     data->width,         // width,
	                     data->height,        // height,
	                     &rtr->framebuffer)); // out_external_framebuffer

	return true;
}

void
render_gfx_target_resources_close(struct render_gfx_target_resources *rtr)
{
	struct vk_bundle *vk = vk_from_rtr(rtr);

	D(RenderPass, rtr->render_pass);
	D(Pipeline, rtr->mesh.pipeline);
	D(Framebuffer, rtr->framebuffer);
}


/*
 *
 * 'Exported' rendering functions.
 *
 */

bool
render_gfx_init(struct render_gfx *rr, struct render_resources *r)
{
	struct vk_bundle *vk = r->vk;
	rr->r = r;


	/*
	 * Per rendering.
	 */

	C(vk_create_command_buffer(vk, &rr->cmd));

	/*
	 * Mesh per view
	 */

	C(vk_create_descriptor_set(              //
	    vk,                                  // vk_bundle
	    r->mesh.descriptor_pool,             // descriptor_pool
	    r->mesh.descriptor_set_layout,       // descriptor_set_layout
	    &rr->views[0].mesh.descriptor_set)); // descriptor_set

	C(vk_create_descriptor_set(              //
	    vk,                                  // vk_bundle
	    r->mesh.descriptor_pool,             // descriptor_pool
	    r->mesh.descriptor_set_layout,       // descriptor_set_layout
	    &rr->views[1].mesh.descriptor_set)); // descriptor_set

	return true;
}

bool
render_gfx_begin(struct render_gfx *rr)
{
	struct vk_bundle *vk = vk_from_rr(rr);

	os_mutex_lock(&vk->cmd_pool_mutex);
	VkResult ret = vk_begin_command_buffer(vk, rr->cmd);
	if (ret != VK_SUCCESS) {
		os_mutex_unlock(&vk->cmd_pool_mutex);
		return false;
	}

	// Yes we leave the mutex locked.
	return true;
}

bool
render_gfx_end(struct render_gfx *rr)
{
	struct vk_bundle *vk = vk_from_rr(rr);

	VkResult ret = vk_end_command_buffer(vk, rr->cmd);
	os_mutex_unlock(&vk->cmd_pool_mutex);
	if (ret != VK_SUCCESS) {
		return false;
	}

	return true;
}

void
render_gfx_close(struct render_gfx *rr)
{
	struct vk_bundle *vk = vk_from_rr(rr);
	struct render_resources *r = rr->r;

	vk_destroy_command_buffer(vk, rr->cmd);
	rr->cmd = VK_NULL_HANDLE;

	// Reclaimed by vkResetDescriptorPool.
	rr->views[0].mesh.descriptor_set = VK_NULL_HANDLE;
	rr->views[1].mesh.descriptor_set = VK_NULL_HANDLE;

	vk->vkResetDescriptorPool(   //
	    vk->device,              //
	    r->mesh.descriptor_pool, //
	    0);                      //

	U_ZERO(rr);
}


/*
 *
 * 'Exported' draw functions.
 *
 */

bool
render_gfx_begin_target(struct render_gfx *rr, struct render_gfx_target_resources *rtr)
{
	struct vk_bundle *vk = vk_from_rr(rr);

	assert(rr->rtr == NULL);
	rr->rtr = rtr;

	// This is shared across both views.
	begin_render_pass(vk,                    //
	                  rr->cmd,               //
	                  rr->rtr->render_pass,  //
	                  rr->rtr->framebuffer,  //
	                  rr->rtr->data.width,   //
	                  rr->rtr->data.height); //

	return true;
}

void
render_gfx_end_target(struct render_gfx *rr)
{
	struct vk_bundle *vk = vk_from_rr(rr);

	assert(rr->rtr != NULL);
	rr->rtr = NULL;

	// Stop the [shared] render pass.
	vk->vkCmdEndRenderPass(rr->cmd);
}

void
render_gfx_begin_view(struct render_gfx *rr, uint32_t view, struct render_viewport_data *viewport_data)
{
	struct vk_bundle *vk = vk_from_rr(rr);

	// We currently only support two views.
	assert(view == 0 || view == 1);
	assert(rr->rtr != NULL);

	rr->current_view = view;


	/*
	 * Viewport
	 */

	VkViewport viewport = {
	    .x = (float)viewport_data->x,
	    .y = (float)viewport_data->y,
	    .width = (float)viewport_data->w,
	    .height = (float)viewport_data->h,
	    .minDepth = 0.0f,
	    .maxDepth = 1.0f,
	};

	vk->vkCmdSetViewport(rr->cmd,    // commandBuffer
	                     0,          // firstViewport
	                     1,          // viewportCount
	                     &viewport); // pViewports

	/*
	 * Scissor
	 */

	VkRect2D scissor = {
	    .offset =
	        {
	            .x = viewport_data->x,
	            .y = viewport_data->y,
	        },
	    .extent =
	        {
	            .width = viewport_data->w,
	            .height = viewport_data->h,
	        },
	};

	vk->vkCmdSetScissor(rr->cmd,   // commandBuffer
	                    0,         // firstScissor
	                    1,         // scissorCount
	                    &scissor); // pScissors
}

void
render_gfx_end_view(struct render_gfx *rr)
{
	//! Must have a current target.
	assert(rr->rtr != NULL);
}

void
render_gfx_distortion(struct render_gfx *rr)
{
	struct vk_bundle *vk = vk_from_rr(rr);
	struct render_resources *r = rr->r;

	uint32_t view = rr->current_view;
	struct render_gfx_view *v = &rr->views[view];

	/*
	 * Descriptors and pipeline.
	 */

	VkDescriptorSet descriptor_sets[1] = {v->mesh.descriptor_set};
	vk->vkCmdBindDescriptorSets(         //
	    rr->cmd,                         // commandBuffer
	    VK_PIPELINE_BIND_POINT_GRAPHICS, // pipelineBindPoint
	    r->mesh.pipeline_layout,         // layout
	    0,                               // firstSet
	    ARRAY_SIZE(descriptor_sets),     // descriptorSetCount
	    descriptor_sets,                 // pDescriptorSets
	    0,                               // dynamicOffsetCount
	    NULL);                           // pDynamicOffsets

	vk->vkCmdBindPipeline(               //
	    rr->cmd,                         // commandBuffer
	    VK_PIPELINE_BIND_POINT_GRAPHICS, // pipelineBindPoint
	    rr->rtr->mesh.pipeline);         // pipeline


	/*
	 * Vertex buffer.
	 */

	VkBuffer buffers[1] = {r->mesh.vbo.buffer};
	VkDeviceSize offsets[1] = {0};
	assert(ARRAY_SIZE(buffers) == ARRAY_SIZE(offsets));

	vk->vkCmdBindVertexBuffers( //
	    rr->cmd,                // commandBuffer
	    0,                      // firstBinding
	    ARRAY_SIZE(buffers),    // bindingCount
	    buffers,                // pBuffers
	    offsets);               // pOffsets


	/*
	 * Draw with indices or not?
	 */

	if (r->mesh.index_count_total > 0) {
		vk->vkCmdBindIndexBuffer(  //
		    rr->cmd,               // commandBuffer
		    r->mesh.ibo.buffer,    // buffer
		    0,                     // offset
		    VK_INDEX_TYPE_UINT32); // indexType

		vk->vkCmdDrawIndexed(            //
		    rr->cmd,                     // commandBuffer
		    r->mesh.index_counts[view],  // indexCount
		    1,                           // instanceCount
		    r->mesh.index_offsets[view], // firstIndex
		    0,                           // vertexOffset
		    0);                          // firstInstance
	} else {
		vk->vkCmdDraw(            //
		    rr->cmd,              // commandBuffer
		    r->mesh.vertex_count, // vertexCount
		    1,                    // instanceCount
		    0,                    // firstVertex
		    0);                   // firstInstance
	}
}

void
render_gfx_update_distortion(struct render_gfx *rr,
                             uint32_t view_index,
                             VkSampler sampler,
                             VkImageView image_view,
                             struct render_gfx_mesh_ubo_data *data)
{
	struct vk_bundle *vk = vk_from_rr(rr);
	struct render_resources *r = rr->r;
	struct render_gfx_view *v = &rr->views[view_index];

	render_buffer_write(vk, &r->mesh.ubos[view_index], data, sizeof(struct render_gfx_mesh_ubo_data));

	update_mesh_discriptor_set(          //
	    vk,                              // vk_bundle
	    r->mesh.src_binding,             // src_binding
	    sampler,                         // sampler
	    image_view,                      // image_view
	    r->mesh.ubo_binding,             // ubo_binding
	    r->mesh.ubos[view_index].buffer, // buffer
	    VK_WHOLE_SIZE,                   // size
	    v->mesh.descriptor_set);         // descriptor_set
}