sprite.pipeline.cpp

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#include <planet/vk/engine/renderer.hpp>
#include <planet/vk/engine/sprite.pipeline.hpp>

planet::vk::engine::pipeline::sprite

 
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namespace {


    constexpr auto binding_description{[]() {
        VkVertexInputBindingDescription description{};

        description.binding = 0;
        description.stride =
                sizeof(planet::vk::engine::pipeline::sprite::vertex);
        description.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;

        return std::array{description};
    }()};
    constexpr auto attribute_description{[]() {
        std::array<VkVertexInputAttributeDescription, 3> attrs{};

        attrs[0].binding = 0;
        attrs[0].location = 0;
        attrs[0].format = VK_FORMAT_R32G32B32A32_SFLOAT;
        attrs[0].offset =
                offsetof(planet::vk::engine::pipeline::sprite::vertex, p);

        attrs[1].binding = 0;
        attrs[1].location = 1;
        attrs[1].format = VK_FORMAT_R32G32B32A32_SFLOAT;
        attrs[1].offset =
                offsetof(planet::vk::engine::pipeline::sprite::vertex, col);

        attrs[2].binding = 0;
        attrs[2].location = 2;
        attrs[2].format = VK_FORMAT_R32G32_SFLOAT;
        attrs[2].offset =
                offsetof(planet::vk::engine::pipeline::sprite::vertex, uv);

        return attrs;
    }()};


}


planet::vk::engine::pipeline::sprite::sprite(
        std::string_view const n,
        engine::renderer &r,
        std::string_view const vs,
        std::uint32_t const mtpf,
        id::suffix const suffix)
: id{n, suffix},
  texture_layout{[&]() {
      VkDescriptorSetLayoutBinding binding{};
      binding.binding = 0;
      binding.descriptorCount = 1;
      binding.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
      binding.pImmutableSamplers = nullptr;
      binding.stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
      return vk::descriptor_set_layout{r.app.device, binding};
  }()},
  pipeline{create_pipeline(r, vs)},
  max_textures_per_frame{mtpf},
  texture_pool{
          r.app.device,
          static_cast<std::uint32_t>(
                  max_frames_in_flight * max_textures_per_frame)},
  texture_sets{
          vk::descriptor_sets{
                  texture_pool, texture_layout, max_textures_per_frame},
          vk::descriptor_sets{
                  texture_pool, texture_layout, max_textures_per_frame},
          vk::descriptor_sets{
                  texture_pool, texture_layout, max_textures_per_frame}},
  textures_in_frame{name() + "__textures_in_frame"} {}


planet::vk::graphics_pipeline
        planet::vk::engine::pipeline::sprite::create_pipeline(
                engine::renderer &r, std::string_view const vertex_shader) {
    VkPushConstantRange pc;
    pc.offset = 0;
    pc.size = sizeof(push_constant);
    pc.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
    return planet::vk::engine::create_graphics_pipeline(
            {.app = r.app,
             .renderer = r,
             .vertex_shader = vertex_shader,
             .fragment_shader = "planet-vk-engine/sprite.frag.spirv",
             .binding_descriptions = binding_description,
             .attribute_descriptions = attribute_description,
             .pipeline_layout = pipeline_layout{
                     r.app.device,
                     std::array{r.ubo_layout.get(), texture_layout.get()},
                     std::array{pc}}});
}


void planet::vk::engine::pipeline::sprite::draw(
        std::pair<vk::texture const &, affine::rectangle2d> texture,
        location const &loc,
        vk::colour const &colour) {
    auto const pos = affine::rectangle2d{
            affine::point2d{0, loc.size.height} - loc.centre,
            affine::extents2d{loc.size.width, -loc.size.height}};
    std::size_t const quad_index = quads.size();

    quads.push_back(
            {{pos.bottom_right().x(), pos.bottom_right().y(), loc.z_height},
             colour,
             {texture.second.bottom_right().x(),
              texture.second.bottom_right().y()}});
    quads.push_back(
            {{pos.bottom_right().x(), pos.top_left.y(), loc.z_height},
             colour,
             {texture.second.bottom_right().x(), texture.second.top_left.y()}});
    quads.push_back(
            {{pos.top_left.x(), pos.top_left.y(), loc.z_height},
             colour,
             {texture.second.top_left.x(), texture.second.top_left.y()}});
    quads.push_back(
            {{pos.top_left.x(), pos.bottom_right().y(), loc.z_height},
             colour,
             {texture.second.top_left.x(), texture.second.bottom_right().y()}});

    indexes.push_back(quad_index);
    indexes.push_back(quad_index + 2);
    indexes.push_back(quad_index + 1);
    indexes.push_back(quad_index);
    indexes.push_back(quad_index + 3);
    indexes.push_back(quad_index + 2);

    textures.emplace_back();
    textures.back().imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
    textures.back().imageView = texture.first.image_view.get();
    textures.back().sampler = texture.first.sampler.get();

    transforms.push_back({planet::affine::matrix3d{
            planet::affine::matrix2d::translate(
                    {loc.offset.xh, loc.offset.yh, loc.offset.h})
            * planet::affine::matrix2d::rotate(loc.rotation)}});
}


void planet::vk::engine::pipeline::sprite::render(render_parameters rp) {
    if (quads.empty()) { return; }

    auto &vertex_buffer = vertex_buffers[rp.current_frame];
    vertex_buffer = {
            rp.renderer.per_frame_memory, quads,
            VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
            VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT
                    | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT};
    auto &index_buffer = index_buffers[rp.current_frame];
    index_buffer = {
            rp.renderer.per_frame_memory, indexes,
            VK_BUFFER_USAGE_INDEX_BUFFER_BIT,
            VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT
                    | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT};

    std::array buffers{vertex_buffer.get()};
    std::array offset{VkDeviceSize{}};

    vkCmdBindVertexBuffers(
            rp.cb.get(), 0, buffers.size(), buffers.data(), offset.data());
    vkCmdBindIndexBuffer(
            rp.cb.get(), index_buffer.get(), 0, VK_INDEX_TYPE_UINT32);

    textures_in_frame.value(textures.size());
    if (textures.size() > max_textures_per_frame) {
        planet::log::error("We will run out of texture slots for this frame");
    }
    for (std::size_t index{}; auto const &tx : textures) {
        VkWriteDescriptorSet wds{};
        wds.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
        wds.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
        wds.dstSet = texture_sets[rp.current_frame][index];
        wds.dstBinding = 0;
        wds.dstArrayElement = 0;
        wds.descriptorCount = 1;
        wds.pImageInfo = &tx;
        vkUpdateDescriptorSets(
                rp.renderer.app.device.get(), 1, &wds, 0, nullptr);

        vkCmdBindDescriptorSets(
                rp.cb.get(), VK_PIPELINE_BIND_POINT_GRAPHICS,
                pipeline.layout.get(), 1, 1,
                &texture_sets[rp.current_frame][index], 0, nullptr);

        vkCmdPushConstants(
                rp.cb.get(), pipeline.layout.get(), VK_SHADER_STAGE_VERTEX_BIT,
                0, sizeof(push_constant), &transforms[index]);

        static constexpr std::uint32_t index_count = 6;
        static constexpr std::uint32_t instance_count = 1;
        static constexpr std::int32_t vertex_offset = 0;
        static constexpr std::uint32_t first_instance = 0;
        vkCmdDrawIndexed(
                rp.cb.get(), index_count, instance_count, index * index_count,
                vertex_offset, first_instance);

        ++index;
    }

    // Clear out data from this frame
    quads.clear();
    indexes.clear();
    textures.clear();
    transforms.clear();
}