Method prepare_textures

cube/cube.cpp:2858–2939

}

void Demo::prepare_textures() {
    vk::Format const tex_format = vk::Format::eR8G8B8A8Srgb;
    vk::FormatProperties props;
    gpu.getFormatProperties(tex_format, &props);

    for (uint32_t i = 0; i < texture_count; i++) {
        if ((props.linearTilingFeatures & vk::FormatFeatureFlagBits::eSampledImage) && !use_staging_buffer) {
            /* Device can texture using linear textures */
            prepare_texture_image(tex_files[i], textures[i], vk::ImageTiling::eLinear, vk::ImageUsageFlagBits::eSampled,
                                  vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent);
            // Nothing in the pipeline needs to be complete to start, and don't allow fragment
            // shader to run until layout transition completes
            set_image_layout(textures[i].image, vk::ImageAspectFlagBits::eColor, vk::ImageLayout::ePreinitialized,
                             textures[i].imageLayout, vk::AccessFlagBits(), vk::PipelineStageFlagBits::eTopOfPipe,
                             vk::PipelineStageFlagBits::eFragmentShader);
            staging_texture.image = vk::Image();
        } else if (props.optimalTilingFeatures & vk::FormatFeatureFlagBits::eSampledImage) {
            /* Must use staging buffer to copy linear texture to optimized */

            prepare_texture_buffer(tex_files[i], staging_texture);

            prepare_texture_image(tex_files[i], textures[i], vk::ImageTiling::eOptimal,
                                  vk::ImageUsageFlagBits::eTransferDst | vk::ImageUsageFlagBits::eSampled,
                                  vk::MemoryPropertyFlagBits::eDeviceLocal);

            set_image_layout(textures[i].image, vk::ImageAspectFlagBits::eColor, vk::ImageLayout::ePreinitialized,
                             vk::ImageLayout::eTransferDstOptimal, vk::AccessFlagBits(), vk::PipelineStageFlagBits::eTopOfPipe,
                             vk::PipelineStageFlagBits::eTransfer);

            auto const subresource = vk::ImageSubresourceLayers()
                                         .setAspectMask(vk::ImageAspectFlagBits::eColor)
                                         .setMipLevel(0)
                                         .setBaseArrayLayer(0)
                                         .setLayerCount(1);

            auto const copy_region = vk::BufferImageCopy()
                                         .setBufferOffset(0)
                                         .setBufferRowLength(staging_texture.tex_width)
                                         .setBufferImageHeight(staging_texture.tex_height)
                                         .setImageSubresource(subresource)
                                         .setImageOffset({0, 0, 0})
                                         .setImageExtent({staging_texture.tex_width, staging_texture.tex_height, 1});

            cmd.copyBufferToImage(staging_texture.buffer, textures[i].image, vk::ImageLayout::eTransferDstOptimal, 1, &copy_region);

            set_image_layout(textures[i].image, vk::ImageAspectFlagBits::eColor, vk::ImageLayout::eTransferDstOptimal,
                             textures[i].imageLayout, vk::AccessFlagBits::eTransferWrite, vk::PipelineStageFlagBits::eTransfer,
                             vk::PipelineStageFlagBits::eFragmentShader);
        } else {
            assert(false && "No support for R8G8B8A8_SRGB as texture image format");
        }

        auto const samplerInfo = vk::SamplerCreateInfo()
                                     .setMagFilter(vk::Filter::eNearest)
                                     .setMinFilter(vk::Filter::eNearest)
                                     .setMipmapMode(vk::SamplerMipmapMode::eNearest)
                                     .setAddressModeU(vk::SamplerAddressMode::eClampToEdge)
                                     .setAddressModeV(vk::SamplerAddressMode::eClampToEdge)