/* Copyright (c) 2019-2025, Sascha Willems * * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 the "License"; * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * Runtime mip map generation */ #include "texture_mipmap_generation.h" TextureMipMapGeneration::TextureMipMapGeneration() { zoom = -2.5f; rotation = {0.0f, 15.0f, 0.0f}; title = "Texture MipMap generation"; } TextureMipMapGeneration::~TextureMipMapGeneration() { if (has_device()) { vkDestroyPipeline(get_device().get_handle(), pipeline, nullptr); vkDestroyPipelineLayout(get_device().get_handle(), pipeline_layout, nullptr); vkDestroyDescriptorSetLayout(get_device().get_handle(), descriptor_set_layout, nullptr); for (auto sampler : samplers) { vkDestroySampler(get_device().get_handle(), sampler, nullptr); } } destroy_texture(texture); uniform_buffer.reset(); } // Enable physical device features required for this example void TextureMipMapGeneration::request_gpu_features(vkb::PhysicalDevice &gpu) { // Enable anisotropic filtering if supported if (gpu.get_features().samplerAnisotropy) { gpu.get_mutable_requested_features().samplerAnisotropy = VK_TRUE; } } /* Load the base texture containing only the first mip level and generate the whole mip-chain at runtime */ void TextureMipMapGeneration::load_texture_generate_mipmaps(std::string file_name) { // ktx1 doesn't know whether the content is sRGB or linear, but most tools save in sRGB, so assume that. VkFormat format = VK_FORMAT_R8G8B8A8_SRGB; ktxTexture *ktx_texture; KTX_error_code result; result = ktxTexture_CreateFromNamedFile(file_name.c_str(), KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT, &ktx_texture); // @todo: get format from libktx if (ktx_texture == nullptr) { throw std::runtime_error("Couldn't load texture"); } texture.width = ktx_texture->baseWidth; texture.height = ktx_texture->baseHeight; // Calculate number of mip levels as per Vulkan specs: // numLevels = 1 + floor(log2(max(w, h, d))) texture.mip_levels = static_cast(floor(log2(std::max(texture.width, texture.height))) + 1); // Get device properties for the requested texture format // Check if the selected format supports blit source and destination, which is required for generating the mip levels // If this is not supported you could implement a fallback via compute shader image writes and stores VkFormatProperties formatProperties; vkGetPhysicalDeviceFormatProperties(get_device().get_gpu().get_handle(), format, &formatProperties); if (!(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_BLIT_SRC_BIT) || !(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_BLIT_DST_BIT)) { throw std::runtime_error("Selected image format does not support blit source and destination"); } VkMemoryAllocateInfo memory_allocate_info = vkb::initializers::memory_allocate_info(); VkMemoryRequirements memory_requirements = {}; ktx_uint8_t *ktx_image_data = ktx_texture->pData; ktx_size_t ktx_texture_size = ktx_texture->dataSize; // Create a host-visible staging buffer that contains the raw image data VkBuffer staging_buffer; VkDeviceMemory staging_memory; VkBufferCreateInfo buffer_create_info = vkb::initializers::buffer_create_info(); buffer_create_info.size = ktx_texture_size; // This buffer is used as a transfer source for the buffer copy buffer_create_info.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT; buffer_create_info.sharingMode = VK_SHARING_MODE_EXCLUSIVE; VK_CHECK(vkCreateBuffer(get_device().get_handle(), &buffer_create_info, nullptr, &staging_buffer)); // Get memory requirements for the staging buffer (alignment, memory type bits) vkGetBufferMemoryRequirements(get_device().get_handle(), staging_buffer, &memory_requirements); memory_allocate_info.allocationSize = memory_requirements.size; // Get memory type index for a host visible buffer memory_allocate_info.memoryTypeIndex = get_device().get_gpu().get_memory_type(memory_requirements.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT); VK_CHECK(vkAllocateMemory(get_device().get_handle(), &memory_allocate_info, nullptr, &staging_memory)); VK_CHECK(vkBindBufferMemory(get_device().get_handle(), staging_buffer, staging_memory, 0)); // Copy ktx image data into host local staging buffer uint8_t *data; VK_CHECK(vkMapMemory(get_device().get_handle(), staging_memory, 0, memory_requirements.size, 0, (void **) &data)); memcpy(data, ktx_image_data, ktx_texture_size); vkUnmapMemory(get_device().get_handle(), staging_memory); // now, the ktx_texture can be destroyed ktxTexture_Destroy(ktx_texture); // Create optimal tiled target image on the device VkImageCreateInfo image_create_info = vkb::initializers::image_create_info(); image_create_info.imageType = VK_IMAGE_TYPE_2D; image_create_info.format = format; image_create_info.mipLevels = texture.mip_levels; image_create_info.arrayLayers = 1; image_create_info.samples = VK_SAMPLE_COUNT_1_BIT; image_create_info.tiling = VK_IMAGE_TILING_OPTIMAL; image_create_info.sharingMode = VK_SHARING_MODE_EXCLUSIVE; image_create_info.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED; image_create_info.extent = {texture.width, texture.height, 1}; image_create_info.usage = VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_SAMPLED_BIT; VK_CHECK(vkCreateImage(get_device().get_handle(), &image_create_info, nullptr, &texture.image)); vkGetImageMemoryRequirements(get_device().get_handle(), texture.image, &memory_requirements); memory_allocate_info.allocationSize = memory_requirements.size; memory_allocate_info.memoryTypeIndex = get_device().get_gpu().get_memory_type(memory_requirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT); VK_CHECK(vkAllocateMemory(get_device().get_handle(), &memory_allocate_info, nullptr, &texture.device_memory)); VK_CHECK(vkBindImageMemory(get_device().get_handle(), texture.image, texture.device_memory, 0)); VkCommandBuffer copy_command = get_device().create_command_buffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true); // Optimal image will be used as destination for the copy, so we must transfer from our initial undefined image layout to the transfer destination layout vkb::image_layout_transition(copy_command, texture.image, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL); // Copy the first mip of the chain, remaining mips will be generated VkBufferImageCopy buffer_copy_region = {}; buffer_copy_region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT; buffer_copy_region.imageSubresource.mipLevel = 0; buffer_copy_region.imageSubresource.baseArrayLayer = 0; buffer_copy_region.imageSubresource.layerCount = 1; buffer_copy_region.imageExtent.width = texture.width; buffer_copy_region.imageExtent.height = texture.height; buffer_copy_region.imageExtent.depth = 1; vkCmdCopyBufferToImage(copy_command, staging_buffer, texture.image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &buffer_copy_region); // Transition first mip level to transfer source so we can blit(read) from it vkb::image_layout_transition(copy_command, texture.image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL); get_device().flush_command_buffer(copy_command, queue, true); // Clean up staging resources vkDestroyBuffer(get_device().get_handle(), staging_buffer, nullptr); vkFreeMemory(get_device().get_handle(), staging_memory, nullptr); // Generate the mip chain // --------------------------------------------------------------- // We copy down the whole mip chain doing a blit from mip-1 to mip // An alternative way would be to always blit from the first mip level and sample that one down VkCommandBuffer blit_command = get_device().create_command_buffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true); // Copy down mips from n-1 to n for (uint32_t i = 1; i < texture.mip_levels; i++) { VkImageBlit image_blit{}; // Source image_blit.srcSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT; image_blit.srcSubresource.layerCount = 1; image_blit.srcSubresource.mipLevel = i - 1; image_blit.srcOffsets[1].x = static_cast(texture.width >> (i - 1)); image_blit.srcOffsets[1].y = static_cast(texture.height >> (i - 1)); image_blit.srcOffsets[1].z = 1; // Destination image_blit.dstSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT; image_blit.dstSubresource.layerCount = 1; image_blit.dstSubresource.mipLevel = i; image_blit.dstOffsets[1].x = static_cast(texture.width >> i); image_blit.dstOffsets[1].y = static_cast(texture.height >> i); image_blit.dstOffsets[1].z = 1; // Prepare current mip level as image blit destination vkb::image_layout_transition(blit_command, texture.image, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, {VK_IMAGE_ASPECT_COLOR_BIT, i, 1, 0, 1}); // Blit from previous level vkCmdBlitImage( blit_command, texture.image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, texture.image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &image_blit, VK_FILTER_LINEAR); // Prepare current mip level as image blit source for next level vkb::image_layout_transition(blit_command, texture.image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, {VK_IMAGE_ASPECT_COLOR_BIT, i, 1, 0, 1}); } // After the loop, all mip layers are in TRANSFER_SRC layout, so transition all to SHADER_READ vkb::image_layout_transition(blit_command, texture.image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, {VK_IMAGE_ASPECT_COLOR_BIT, 0, texture.mip_levels, 0, 1}); get_device().flush_command_buffer(blit_command, queue, true); // --------------------------------------------------------------- // Calculate valid filter and mipmap modes VkFilter filter = VK_FILTER_LINEAR; VkSamplerMipmapMode mipmap_mode = VK_SAMPLER_MIPMAP_MODE_LINEAR; vkb::make_filters_valid(get_device().get_gpu().get_handle(), format, &filter, &mipmap_mode); // Create samplers for different mip map demonstration cases samplers.resize(3); VkSamplerCreateInfo sampler = vkb::initializers::sampler_create_info(); sampler.magFilter = filter; sampler.minFilter = filter; sampler.mipmapMode = mipmap_mode; sampler.addressModeU = VK_SAMPLER_ADDRESS_MODE_REPEAT; sampler.addressModeV = VK_SAMPLER_ADDRESS_MODE_REPEAT; sampler.addressModeW = VK_SAMPLER_ADDRESS_MODE_REPEAT; sampler.mipLodBias = 0.0f; sampler.compareOp = VK_COMPARE_OP_NEVER; sampler.minLod = 0.0f; sampler.maxLod = 0.0f; sampler.borderColor = VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE; sampler.maxAnisotropy = 1.0; sampler.anisotropyEnable = VK_FALSE; // Without mip mapping VK_CHECK(vkCreateSampler(get_device().get_handle(), &sampler, nullptr, &samplers[0])); // With mip mapping sampler.maxLod = static_cast(texture.mip_levels); VK_CHECK(vkCreateSampler(get_device().get_handle(), &sampler, nullptr, &samplers[1])); // With mip mapping and anisotropic filtering (when supported) if (get_device().get_gpu().get_features().samplerAnisotropy) { sampler.maxAnisotropy = get_device().get_gpu().get_properties().limits.maxSamplerAnisotropy; sampler.anisotropyEnable = VK_TRUE; } VK_CHECK(vkCreateSampler(get_device().get_handle(), &sampler, nullptr, &samplers[2])); // Create image view VkImageViewCreateInfo view = vkb::initializers::image_view_create_info(); view.image = texture.image; view.viewType = VK_IMAGE_VIEW_TYPE_2D; view.format = format; view.components = {VK_COMPONENT_SWIZZLE_R, VK_COMPONENT_SWIZZLE_G, VK_COMPONENT_SWIZZLE_B, VK_COMPONENT_SWIZZLE_A}; view.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT; view.subresourceRange.baseMipLevel = 0; view.subresourceRange.baseArrayLayer = 0; view.subresourceRange.layerCount = 1; view.subresourceRange.levelCount = texture.mip_levels; VK_CHECK(vkCreateImageView(get_device().get_handle(), &view, nullptr, &texture.view)); } // Free all Vulkan resources used by a texture object void TextureMipMapGeneration::destroy_texture(Texture texture) { vkDestroyImageView(get_device().get_handle(), texture.view, nullptr); vkDestroyImage(get_device().get_handle(), texture.image, nullptr); vkFreeMemory(get_device().get_handle(), texture.device_memory, nullptr); } void TextureMipMapGeneration::load_assets() { load_texture_generate_mipmaps(vkb::fs::path::get(vkb::fs::path::Assets, "textures/checkerboard_rgba.ktx")); scene = load_model("scenes/tunnel_cylinder.gltf"); } void TextureMipMapGeneration::build_command_buffers() { VkCommandBufferBeginInfo command_buffer_begin_info = vkb::initializers::command_buffer_begin_info(); VkClearValue clear_values[2]; clear_values[0].color = default_clear_color; clear_values[1].depthStencil = {1.0f, 0}; VkRenderPassBeginInfo render_pass_begin_info = vkb::initializers::render_pass_begin_info(); render_pass_begin_info.renderPass = render_pass; render_pass_begin_info.renderArea.offset.x = 0; render_pass_begin_info.renderArea.offset.y = 0; render_pass_begin_info.renderArea.extent.width = width; render_pass_begin_info.renderArea.extent.height = height; render_pass_begin_info.clearValueCount = 2; render_pass_begin_info.pClearValues = clear_values; for (int32_t i = 0; i < draw_cmd_buffers.size(); ++i) { render_pass_begin_info.framebuffer = framebuffers[i]; VK_CHECK(vkBeginCommandBuffer(draw_cmd_buffers[i], &command_buffer_begin_info)); vkCmdBeginRenderPass(draw_cmd_buffers[i], &render_pass_begin_info, VK_SUBPASS_CONTENTS_INLINE); VkViewport viewport = vkb::initializers::viewport(static_cast(width), static_cast(height), 0.0f, 1.0f); vkCmdSetViewport(draw_cmd_buffers[i], 0, 1, &viewport); VkRect2D scissor = vkb::initializers::rect2D(width, height, 0, 0); vkCmdSetScissor(draw_cmd_buffers[i], 0, 1, &scissor); vkCmdBindDescriptorSets(draw_cmd_buffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline_layout, 0, 1, &descriptor_set, 0, NULL); vkCmdBindPipeline(draw_cmd_buffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline); draw_model(scene, draw_cmd_buffers[i]); draw_ui(draw_cmd_buffers[i]); vkCmdEndRenderPass(draw_cmd_buffers[i]); VK_CHECK(vkEndCommandBuffer(draw_cmd_buffers[i])); } } void TextureMipMapGeneration::draw() { ApiVulkanSample::prepare_frame(); // Command buffer to be submitted to the queue submit_info.commandBufferCount = 1; submit_info.pCommandBuffers = &draw_cmd_buffers[current_buffer]; // Submit to queue VK_CHECK(vkQueueSubmit(queue, 1, &submit_info, VK_NULL_HANDLE)); ApiVulkanSample::submit_frame(); } void TextureMipMapGeneration::setup_descriptor_pool() { // Example uses one ubo and one image sampler std::vector pool_sizes = { vkb::initializers::descriptor_pool_size(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1), vkb::initializers::descriptor_pool_size(VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, 1), vkb::initializers::descriptor_pool_size(VK_DESCRIPTOR_TYPE_SAMPLER, 3), }; VkDescriptorPoolCreateInfo descriptor_pool_create_info = vkb::initializers::descriptor_pool_create_info( static_cast(pool_sizes.size()), pool_sizes.data(), 2); VK_CHECK(vkCreateDescriptorPool(get_device().get_handle(), &descriptor_pool_create_info, nullptr, &descriptor_pool)); } void TextureMipMapGeneration::setup_descriptor_set_layout() { std::vector set_layout_bindings = { // Binding 0 : Parameter uniform buffer vkb::initializers::descriptor_set_layout_binding( VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 0), // Binding 1 : Fragment shader image sampler vkb::initializers::descriptor_set_layout_binding( VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, VK_SHADER_STAGE_FRAGMENT_BIT, 1), // Binding 2 : Sampler array (3 descriptors) vkb::initializers::descriptor_set_layout_binding( VK_DESCRIPTOR_TYPE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 2, 3), }; VkDescriptorSetLayoutCreateInfo descriptor_layout = vkb::initializers::descriptor_set_layout_create_info( set_layout_bindings.data(), static_cast(set_layout_bindings.size())); VK_CHECK(vkCreateDescriptorSetLayout(get_device().get_handle(), &descriptor_layout, nullptr, &descriptor_set_layout)); VkPipelineLayoutCreateInfo pipeline_layout_create_info = vkb::initializers::pipeline_layout_create_info( &descriptor_set_layout, 1); VK_CHECK(vkCreatePipelineLayout(get_device().get_handle(), &pipeline_layout_create_info, nullptr, &pipeline_layout)); } void TextureMipMapGeneration::setup_descriptor_set() { VkDescriptorSetAllocateInfo alloc_info = vkb::initializers::descriptor_set_allocate_info( descriptor_pool, &descriptor_set_layout, 1); VK_CHECK(vkAllocateDescriptorSets(get_device().get_handle(), &alloc_info, &descriptor_set)); VkDescriptorBufferInfo buffer_descriptor = create_descriptor(*uniform_buffer); VkDescriptorImageInfo image_descriptor; image_descriptor.imageView = texture.view; image_descriptor.sampler = VK_NULL_HANDLE; image_descriptor.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL; std::vector write_descriptor_sets = { // Binding 0 : Vertex shader uniform buffer vkb::initializers::write_descriptor_set( descriptor_set, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &buffer_descriptor), // Binding 1 : Fragment shader texture sampler vkb::initializers::write_descriptor_set( descriptor_set, VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, 1, &image_descriptor)}; // Binding 2: Sampler array std::vector sampler_descriptors; for (auto i = 0; i < samplers.size(); i++) { sampler_descriptors.push_back({samplers[i], VK_NULL_HANDLE, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL}); } VkWriteDescriptorSet write_descriptor_set{}; write_descriptor_set.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET; write_descriptor_set.dstSet = descriptor_set; write_descriptor_set.descriptorType = VK_DESCRIPTOR_TYPE_SAMPLER; write_descriptor_set.descriptorCount = static_cast(sampler_descriptors.size()); write_descriptor_set.pImageInfo = sampler_descriptors.data(); write_descriptor_set.dstBinding = 2; write_descriptor_set.dstArrayElement = 0; write_descriptor_sets.push_back(write_descriptor_set); vkUpdateDescriptorSets(get_device().get_handle(), static_cast(write_descriptor_sets.size()), write_descriptor_sets.data(), 0, nullptr); } void TextureMipMapGeneration::prepare_pipelines() { VkPipelineInputAssemblyStateCreateInfo input_assembly_state = vkb::initializers::pipeline_input_assembly_state_create_info( VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, 0, VK_FALSE); VkPipelineRasterizationStateCreateInfo rasterization_state = vkb::initializers::pipeline_rasterization_state_create_info( VK_POLYGON_MODE_FILL, VK_CULL_MODE_NONE, VK_FRONT_FACE_COUNTER_CLOCKWISE, 0); VkPipelineColorBlendAttachmentState blend_attachment_state = vkb::initializers::pipeline_color_blend_attachment_state( 0xf, VK_FALSE); VkPipelineColorBlendStateCreateInfo color_blend_state = vkb::initializers::pipeline_color_blend_state_create_info( 1, &blend_attachment_state); VkPipelineDepthStencilStateCreateInfo depth_stencil_state = vkb::initializers::pipeline_depth_stencil_state_create_info( VK_TRUE, VK_TRUE, VK_COMPARE_OP_LESS_OR_EQUAL); VkPipelineViewportStateCreateInfo viewport_state = vkb::initializers::pipeline_viewport_state_create_info(1, 1, 0); VkPipelineMultisampleStateCreateInfo multisample_state = vkb::initializers::pipeline_multisample_state_create_info( VK_SAMPLE_COUNT_1_BIT, 0); std::vector dynamic_state_enables = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR}; VkPipelineDynamicStateCreateInfo dynamic_state = vkb::initializers::pipeline_dynamic_state_create_info( dynamic_state_enables.data(), static_cast(dynamic_state_enables.size()), 0); // Load shaders std::array shader_stages; shader_stages[0] = load_shader("texture_mipmap_generation", "texture.vert.spv", VK_SHADER_STAGE_VERTEX_BIT); shader_stages[1] = load_shader("texture_mipmap_generation", "texture.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT); // Vertex bindings and attributes const std::vector vertex_input_bindings = { vkb::initializers::vertex_input_binding_description(0, sizeof(Vertex), VK_VERTEX_INPUT_RATE_VERTEX), }; const std::vector vertex_input_attributes = { vkb::initializers::vertex_input_attribute_description(0, 0, VK_FORMAT_R32G32B32_SFLOAT, 0), // Location 0: Position vkb::initializers::vertex_input_attribute_description(0, 1, VK_FORMAT_R32G32_SFLOAT, sizeof(float) * 6), // Location 1: UV }; VkPipelineVertexInputStateCreateInfo vertex_input_state = vkb::initializers::pipeline_vertex_input_state_create_info(); vertex_input_state.vertexBindingDescriptionCount = static_cast(vertex_input_bindings.size()); vertex_input_state.pVertexBindingDescriptions = vertex_input_bindings.data(); vertex_input_state.vertexAttributeDescriptionCount = static_cast(vertex_input_attributes.size()); vertex_input_state.pVertexAttributeDescriptions = vertex_input_attributes.data(); VkGraphicsPipelineCreateInfo pipeline_create_info = vkb::initializers::pipeline_create_info(pipeline_layout, render_pass, 0); pipeline_create_info.pVertexInputState = &vertex_input_state; pipeline_create_info.pInputAssemblyState = &input_assembly_state; pipeline_create_info.pRasterizationState = &rasterization_state; pipeline_create_info.pColorBlendState = &color_blend_state; pipeline_create_info.pMultisampleState = &multisample_state; pipeline_create_info.pViewportState = &viewport_state; pipeline_create_info.pDepthStencilState = &depth_stencil_state; pipeline_create_info.pDynamicState = &dynamic_state; pipeline_create_info.stageCount = static_cast(shader_stages.size()); pipeline_create_info.pStages = shader_stages.data(); VK_CHECK(vkCreateGraphicsPipelines(get_device().get_handle(), pipeline_cache, 1, &pipeline_create_info, nullptr, &pipeline)); } void TextureMipMapGeneration::prepare_uniform_buffers() { // Shared parameter uniform buffer block uniform_buffer = std::make_unique(get_device(), sizeof(ubo), VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VMA_MEMORY_USAGE_CPU_TO_GPU); update_uniform_buffers(); } void TextureMipMapGeneration::update_uniform_buffers(float delta_time) { ubo.projection = camera.matrices.perspective; ubo.model = camera.matrices.view; ubo.model = glm::rotate(ubo.model, glm::radians(90.0f + timer * 360.0f), glm::vec3(0.0f, 0.0f, 1.0f)); ubo.model = glm::scale(ubo.model, glm::vec3(0.5f)); timer += delta_time * 0.005f; if (timer > 1.0f) { timer -= 1.0f; } uniform_buffer->convert_and_update(ubo); } bool TextureMipMapGeneration::prepare(const vkb::ApplicationOptions &options) { if (!ApiVulkanSample::prepare(options)) { return false; } camera.type = vkb::CameraType::FirstPerson; camera.set_perspective(60.0f, static_cast(width) / static_cast(height), 0.1f, 1024.0f); camera.set_translation(glm::vec3(0.0f, 0.0f, -12.5f)); load_assets(); prepare_uniform_buffers(); setup_descriptor_set_layout(); prepare_pipelines(); setup_descriptor_pool(); setup_descriptor_set(); build_command_buffers(); prepared = true; return true; } void TextureMipMapGeneration::render(float delta_time) { if (!prepared) { return; } draw(); if (rotate_scene) { update_uniform_buffers(delta_time); } } void TextureMipMapGeneration::view_changed() { update_uniform_buffers(); } void TextureMipMapGeneration::on_update_ui_overlay(vkb::Drawer &drawer) { if (drawer.header("Settings")) { drawer.checkbox("Rotate", &rotate_scene); if (drawer.slider_float("LOD bias", &ubo.lod_bias, 0.0f, static_cast(texture.mip_levels))) { update_uniform_buffers(); } if (drawer.combo_box("Sampler type", &ubo.sampler_index, sampler_names)) { update_uniform_buffers(); } } } std::unique_ptr create_texture_mipmap_generation() { return std::make_unique(); }