Crafter.Graphics/examples/VulkanTriangle/main.cpp

#include <vulkan/vulkan.h>

import Crafter.Graphics;
using namespace Crafter;
import std;
import Crafter.Event;
import Crafter.Math;

typedef VulkanShader<"raygen.spv", "main", VK_SHADER_STAGE_RAYGEN_BIT_KHR, 2, {{{VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, 0}, {VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1}}}> Raygenspv;
typedef VulkanShader<"closesthit.spv", "main", VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR, 0, {{}}> Closesthitspv;
typedef VulkanShader<"miss.spv", "main", VK_SHADER_STAGE_MISS_BIT_KHR, 0, {{}}> Misspv;

int main() {
    /*
        This sets up all necessary things and creates the vulkan device.
        This must be called before any vulkan related things.
        Things like VkDevice are static members of the VulkanDevice class.
    */
    VulkanDevice::CreateDevice();
    Raygenspv::CreateShader();
    Closesthitspv::CreateShader();
    Misspv::CreateShader();
    std::array<VkDescriptorSetLayout, 1> layouts {{Raygenspv::layout}};
    PipelineRTVulkan<Raygenspv, Closesthitspv, Misspv, Raygenspv, Closesthitspv, Misspv>::Init(layouts);
    DescriptorPool pool;
    pool.sets.resize(1);
    pool.BuildPool(DescriptorPool::GetPoolSizes<Raygenspv, Closesthitspv, Misspv>(), layouts);

    WindowVulkan window(1280, 720, "HelloVulkan");

    /*
        StartInit gives you a VkCommandBuffer to use before the event loop starts
        Use this for inititializing things like textures.
    */
    VkCommandBuffer cmd = window.StartInit();

    Mesh triangleMesh;
    std::array<Vertex, 3> verts {{{-150, -150, 100}, {0, 150, 100}, {150, -150, 100}}};
    std::array<std::uint32_t, 3> index {{2,1,0}};
    triangleMesh.Build(verts, index, cmd);
    RenderingElement3DVulkan& el = RenderingElement3DVulkan::elements.emplace_back(triangleMesh);
    MatrixRowMajor<float, 4, 3, 1> transform = MatrixRowMajor<float, 4, 3, 1>::Identity();
    std::memcpy(el.instance.transform.matrix, transform.m, sizeof(transform.m));
    RenderingElement3DVulkan::tlases.resize(1);
    RenderingElement3DVulkan::BuildTLAS(cmd, 0);

    VkDescriptorImageInfo imageInfo = {
        .imageView = window.imageViews[0],
        .imageLayout = VK_IMAGE_LAYOUT_GENERAL
    };

    VkWriteDescriptorSetAccelerationStructureKHR writeDescriptorSetAccelerationStructure {
        .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET_ACCELERATION_STRUCTURE_KHR,
        .accelerationStructureCount = 1,
        .pAccelerationStructures = &RenderingElement3DVulkan::tlases[0].accelerationStructure
    };

    VkWriteDescriptorSet write[2] = {
        {
            .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
            .pNext = &writeDescriptorSetAccelerationStructure,
            .dstSet = pool.sets[0],
            .dstBinding = 0,
            .dstArrayElement = 0,
            .descriptorCount = 1,
            .descriptorType = VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR,
        },
        {
            .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
            .dstSet = pool.sets[0],
            .dstBinding = 1,
            .dstArrayElement = 0,
            .descriptorCount = 1,
            .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
            .pImageInfo = &imageInfo
        }
    };
    vkUpdateDescriptorSets(VulkanDevice::device, 2, write, 0, nullptr);


    /*
        FinishInit executes all commands recorded to StartInit.
        This must be called before the the event loops starts if you called StartInit before.
    */
    window.FinishInit();

    window.SetPipelineRT<Raygenspv, Closesthitspv, Misspv, Raygenspv, Closesthitspv, Misspv>();
    window.descriptorsRt = pool.sets;

    
    window.Render();
    window.StartSync();
}