rustial-renderer-wgpu 1.0.0

Pure WGPU renderer for the rustial 2.5D map engine
Documentation 
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//! Image overlay render pipeline.

use crate::gpu::depth::DEPTH_FORMAT;
use crate::gpu::image_overlay_vertex::ImageOverlayVertex;
use crate::pipeline::uniforms::ViewProjUniform;

/// The image overlay rendering pipeline and associated bind group layouts.
pub struct ImageOverlayPipeline {
    /// Render pipeline for image overlay quad drawing.
    pub pipeline: wgpu::RenderPipeline,
    /// Bind group layout for frame-global view-projection uniforms.
    pub uniform_bind_group_layout: wgpu::BindGroupLayout,
    /// Bind group layout for per-overlay texture + sampler.
    pub texture_bind_group_layout: wgpu::BindGroupLayout,
}

impl ImageOverlayPipeline {
    /// Create the image overlay pipeline.
    pub fn new(device: &wgpu::Device, surface_format: wgpu::TextureFormat) -> Self {
        let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
            label: Some("image_overlay_shader"),
            source: wgpu::ShaderSource::Wgsl(
                include_str!("../shaders/image_overlay.wgsl").into(),
            ),
        });

        // Bind group 0: view-projection uniform.
        let uniform_bind_group_layout =
            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
                label: Some("image_overlay_uniform_bgl"),
                entries: &[wgpu::BindGroupLayoutEntry {
                    binding: 0,
                    visibility: wgpu::ShaderStages::VERTEX_FRAGMENT,
                    ty: wgpu::BindingType::Buffer {
                        ty: wgpu::BufferBindingType::Uniform,
                        has_dynamic_offset: false,
                        min_binding_size: wgpu::BufferSize::new(
                            std::mem::size_of::<ViewProjUniform>() as u64,
                        ),
                    },
                    count: None,
                }],
            });

        // Bind group 1: texture + sampler.
        let texture_bind_group_layout =
            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
                label: Some("image_overlay_texture_bgl"),
                entries: &[
                    wgpu::BindGroupLayoutEntry {
                        binding: 0,
                        visibility: wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Texture {
                            multisampled: false,
                            view_dimension: wgpu::TextureViewDimension::D2,
                            sample_type: wgpu::TextureSampleType::Float { filterable: true },
                        },
                        count: None,
                    },
                    wgpu::BindGroupLayoutEntry {
                        binding: 1,
                        visibility: wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
                        count: None,
                    },
                ],
            });

        let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
            label: Some("image_overlay_pipeline_layout"),
            bind_group_layouts: &[&uniform_bind_group_layout, &texture_bind_group_layout],
            push_constant_ranges: &[],
        });

        let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
            label: Some("image_overlay_pipeline"),
            layout: Some(&pipeline_layout),
            vertex: wgpu::VertexState {
                module: &shader,
                entry_point: Some("vs_main"),
                buffers: &[ImageOverlayVertex::layout()],
                compilation_options: wgpu::PipelineCompilationOptions::default(),
            },
            fragment: Some(wgpu::FragmentState {
                module: &shader,
                entry_point: Some("fs_main"),
                targets: &[Some(wgpu::ColorTargetState {
                    format: surface_format,
                    blend: Some(wgpu::BlendState::ALPHA_BLENDING),
                    write_mask: wgpu::ColorWrites::ALL,
                })],
                compilation_options: wgpu::PipelineCompilationOptions::default(),
            }),
            primitive: wgpu::PrimitiveState {
                topology: wgpu::PrimitiveTopology::TriangleList,
                front_face: wgpu::FrontFace::Ccw,
                cull_mode: None, // No culling — overlays can face either way.
                ..Default::default()
            },
            depth_stencil: Some(wgpu::DepthStencilState {
                format: DEPTH_FORMAT,
                depth_write_enabled: false, // Translucent overlay.
                depth_compare: wgpu::CompareFunction::LessEqual,
                stencil: wgpu::StencilState::default(),
                bias: wgpu::DepthBiasState::default(),
            }),
            multisample: wgpu::MultisampleState::default(),
            multiview: None,
            cache: None,
        });

        Self {
            pipeline,
            uniform_bind_group_layout,
            texture_bind_group_layout,
        }
    }
}