Render colored quads
This commit is contained in:
Héctor Ramón Jiménez
parent
70c17b053b
commit
c9510db551
13 changed files with 396 additions and 6 deletions
269
wgpu/src/quad.rs
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269
wgpu/src/quad.rs
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use crate::Transformation;
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use std::mem;
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pub struct Pipeline {
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pipeline: wgpu::RenderPipeline,
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constants: wgpu::BindGroup,
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transform: wgpu::Buffer,
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vertices: wgpu::Buffer,
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indices: wgpu::Buffer,
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instances: wgpu::Buffer,
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}
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impl Pipeline {
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pub fn new(device: &mut wgpu::Device) -> Pipeline {
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let constant_layout =
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device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
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bindings: &[wgpu::BindGroupLayoutBinding {
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binding: 0,
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visibility: wgpu::ShaderStage::VERTEX,
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ty: wgpu::BindingType::UniformBuffer { dynamic: false },
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}],
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});
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let matrix: [f32; 16] = Transformation::identity().into();
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let transform = device
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.create_buffer_mapped(
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16,
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wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
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)
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.fill_from_slice(&matrix[..]);
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let constants = device.create_bind_group(&wgpu::BindGroupDescriptor {
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layout: &constant_layout,
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bindings: &[wgpu::Binding {
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binding: 0,
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resource: wgpu::BindingResource::Buffer {
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buffer: &transform,
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range: 0..64,
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},
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}],
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});
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let layout =
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device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
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bind_group_layouts: &[&constant_layout],
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});
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let vs = include_bytes!("shader/quad.vert.spv");
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let vs_module = device.create_shader_module(
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&wgpu::read_spirv(std::io::Cursor::new(&vs[..]))
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.expect("Read quad vertex shader as SPIR-V"),
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);
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let fs = include_bytes!("shader/quad.frag.spv");
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let fs_module = device.create_shader_module(
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&wgpu::read_spirv(std::io::Cursor::new(&fs[..]))
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.expect("Read quad fragment shader as SPIR-V"),
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);
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let pipeline =
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device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
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layout: &layout,
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vertex_stage: wgpu::ProgrammableStageDescriptor {
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module: &vs_module,
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entry_point: "main",
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},
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fragment_stage: Some(wgpu::ProgrammableStageDescriptor {
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module: &fs_module,
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entry_point: "main",
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}),
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rasterization_state: Some(wgpu::RasterizationStateDescriptor {
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front_face: wgpu::FrontFace::Cw,
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cull_mode: wgpu::CullMode::None,
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depth_bias: 0,
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depth_bias_slope_scale: 0.0,
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depth_bias_clamp: 0.0,
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}),
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primitive_topology: wgpu::PrimitiveTopology::TriangleList,
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color_states: &[wgpu::ColorStateDescriptor {
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format: wgpu::TextureFormat::Bgra8UnormSrgb,
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color_blend: wgpu::BlendDescriptor {
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src_factor: wgpu::BlendFactor::SrcAlpha,
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dst_factor: wgpu::BlendFactor::OneMinusSrcAlpha,
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operation: wgpu::BlendOperation::Add,
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},
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alpha_blend: wgpu::BlendDescriptor {
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src_factor: wgpu::BlendFactor::One,
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dst_factor: wgpu::BlendFactor::OneMinusSrcAlpha,
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operation: wgpu::BlendOperation::Add,
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},
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write_mask: wgpu::ColorWrite::ALL,
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}],
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depth_stencil_state: None,
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index_format: wgpu::IndexFormat::Uint16,
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vertex_buffers: &[
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wgpu::VertexBufferDescriptor {
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stride: mem::size_of::<Vertex>() as u64,
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step_mode: wgpu::InputStepMode::Vertex,
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attributes: &[wgpu::VertexAttributeDescriptor {
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shader_location: 0,
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format: wgpu::VertexFormat::Float2,
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offset: 0,
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}],
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},
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wgpu::VertexBufferDescriptor {
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stride: mem::size_of::<Quad>() as u64,
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step_mode: wgpu::InputStepMode::Instance,
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attributes: &[
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wgpu::VertexAttributeDescriptor {
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shader_location: 1,
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format: wgpu::VertexFormat::Float2,
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offset: 0,
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},
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wgpu::VertexAttributeDescriptor {
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shader_location: 2,
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format: wgpu::VertexFormat::Float2,
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offset: 4 * 2,
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},
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wgpu::VertexAttributeDescriptor {
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shader_location: 3,
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format: wgpu::VertexFormat::Float4,
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offset: 4 * (2 + 2),
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},
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],
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},
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],
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sample_count: 1,
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sample_mask: !0,
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alpha_to_coverage_enabled: false,
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});
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let vertices = device
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.create_buffer_mapped(QUAD_VERTS.len(), wgpu::BufferUsage::VERTEX)
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.fill_from_slice(&QUAD_VERTS);
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let indices = device
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.create_buffer_mapped(QUAD_INDICES.len(), wgpu::BufferUsage::INDEX)
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.fill_from_slice(&QUAD_INDICES);
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let instances = device.create_buffer(&wgpu::BufferDescriptor {
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size: mem::size_of::<Quad>() as u64 * Quad::MAX as u64,
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usage: wgpu::BufferUsage::VERTEX | wgpu::BufferUsage::COPY_DST,
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});
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Pipeline {
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pipeline,
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constants,
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transform,
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vertices,
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indices,
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instances,
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}
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}
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pub fn draw(
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&mut self,
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device: &mut wgpu::Device,
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encoder: &mut wgpu::CommandEncoder,
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instances: &[Quad],
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transformation: Transformation,
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target: &wgpu::TextureView,
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) {
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let matrix: [f32; 16] = transformation.into();
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let transform_buffer = device
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.create_buffer_mapped(16, wgpu::BufferUsage::COPY_SRC)
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.fill_from_slice(&matrix[..]);
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encoder.copy_buffer_to_buffer(
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&transform_buffer,
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0,
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&self.transform,
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0,
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16 * 4,
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);
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let mut i = 0;
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let total = instances.len();
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while i < total {
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let end = (i + Quad::MAX).min(total);
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let amount = end - i;
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let instance_buffer = device
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.create_buffer_mapped(amount, wgpu::BufferUsage::COPY_SRC)
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.fill_from_slice(&instances[i..end]);
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encoder.copy_buffer_to_buffer(
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&instance_buffer,
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0,
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&self.instances,
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0,
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(mem::size_of::<Quad>() * amount) as u64,
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);
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{
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let mut render_pass =
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encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
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color_attachments: &[
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wgpu::RenderPassColorAttachmentDescriptor {
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attachment: target,
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resolve_target: None,
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load_op: wgpu::LoadOp::Load,
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store_op: wgpu::StoreOp::Store,
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clear_color: wgpu::Color {
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r: 0.0,
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g: 0.0,
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b: 0.0,
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a: 0.0,
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},
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},
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],
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depth_stencil_attachment: None,
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});
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render_pass.set_pipeline(&self.pipeline);
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render_pass.set_bind_group(0, &self.constants, &[]);
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render_pass.set_index_buffer(&self.indices, 0);
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render_pass.set_vertex_buffers(
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0,
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&[(&self.vertices, 0), (&self.instances, 0)],
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);
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render_pass.draw_indexed(
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0..QUAD_INDICES.len() as u32,
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0,
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0..amount as u32,
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);
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}
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i += Quad::MAX;
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}
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}
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}
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#[derive(Clone, Copy)]
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pub struct Vertex {
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_position: [f32; 2],
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}
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const QUAD_INDICES: [u16; 6] = [0, 1, 2, 0, 2, 3];
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const QUAD_VERTS: [Vertex; 4] = [
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Vertex {
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_position: [0.0, 0.0],
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},
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Vertex {
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_position: [1.0, 0.0],
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},
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Vertex {
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_position: [1.0, 1.0],
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},
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Vertex {
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_position: [0.0, 1.0],
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},
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];
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#[derive(Debug, Clone, Copy)]
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pub struct Quad {
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pub position: [f32; 2],
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pub scale: [f32; 2],
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pub color: [f32; 4],
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}
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impl Quad {
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const MAX: usize = 100_000;
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}
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