dacho 0.2.0

ECS Game Engine
Documentation 
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// dacho/src/renderer/rendering/geometry.rs

// core
use core::mem::size_of;

// std
use std::collections::HashMap;

// crates
use {
    anyhow::{Context, Result},
    ash::vk
};

// super
use super::shader_input_types;

// crate
use crate::{
    ecs::world::Id,
    renderer::{
        buffers::{Buffer, IndexBuffer, VertexBuffer},
        commands::{Command, CommandPool},
        devices::{Device, PhysicalDevice},
        setup::Instance,
        VulkanDrop
    },
    shader::{ShaderInfo, size_of_types}
};

#[derive(Clone)]
pub struct GeometryData {
    pub shader:       String,
    pub id:           Id,
    pub cull_mode:    u32,
    pub polygon_mode: i32,
    pub vertices:     Vec<f32>,
    pub instances:    Vec<f32>,
        indices:      Vec<u32>
}

impl GeometryData {
    pub const fn new(
        shader:       String,
        id:           Id,
        cull_mode:    vk::CullModeFlags,
        polygon_mode: vk::PolygonMode,
        vertices:     Vec<f32>,
        instances:    Vec<f32>,
        indices:      Vec<u32>
    ) -> Self {
        Self {
            shader,
            id,
            cull_mode:    cull_mode.as_raw(),
            polygon_mode: polygon_mode.as_raw(),
            vertices,
            instances,
            indices
        }
    }
}

#[derive(Hash)]
pub struct Geometry {
    pub shader:          String,
    pub id:              Id,
    pub vertex_buffer:   Buffer,
    pub instance_buffer: Buffer,
    pub index_buffer:    Buffer,
    pub index_count:     u32,
    pub instance_count:  u32
}

impl Geometry {
    pub fn new(
        instance:          &Instance,
        physical_device:   &PhysicalDevice,
        device:            &Device,
        command_pool:      &CommandPool,
        data:              &GeometryData,
        shader_info_cache: &mut HashMap<String, ShaderInfo>
    ) -> Result<Self> {
        let shader      = data.shader.clone();
        let id          = data.id;
        let index_count = u32::try_from(data.indices.len())?;

        if shader_info_cache.get(&data.shader).is_none() {
            let name                         = data.shader.clone();
            let cull_mode                    = vk::CullModeFlags::from_raw(data.cull_mode);
            let polygon_mode                 = vk::PolygonMode::from_raw(data.polygon_mode);
            let (vertex_info, instance_info) = shader_input_types(&data.shader)?;
            let instance_size                = size_of_types(&instance_info) / size_of::<f32>();

            shader_info_cache.insert(
                data.shader.clone(),
                ShaderInfo {
                    name,
                    cull_mode,
                    polygon_mode,
                    vertex_info,
                    instance_info,
                    instance_size
                }
            );
        }

        let instance_count = u32::try_from(
            data.instances.len()
            / shader_info_cache.get(&data.shader)
                .context("Shader instance size cache HashMap error")?
                .instance_size
        )?;

        let   vertex_buffer = VertexBuffer::new_buffer(instance, physical_device, device, command_pool, &data.vertices )?;
        let instance_buffer = VertexBuffer::new_buffer(instance, physical_device, device, command_pool, &data.instances)?;
        let    index_buffer =  IndexBuffer::new_buffer(instance, physical_device, device, command_pool, &data.indices  )?;

        Ok(Self { shader, id, vertex_buffer, instance_buffer, index_buffer, index_count, instance_count })
    }

    pub fn draw(&self) -> Vec<Command> {
        vec![
            Command::BindVertexBuffers(self.vertex_buffer.raw, self.instance_buffer.raw),
            Command::BindIndexBuffer(self.index_buffer.raw),
            Command::DrawIndexed(self.index_count, self.instance_count)
        ]
    }
}

impl VulkanDrop for Geometry {
    fn drop(&self, device: &Device) {
        self.   vertex_buffer.drop(device);
        self. instance_buffer.drop(device);
        self.    index_buffer.drop(device);
    }
}