librashader/librashader-runtime-d3d12/src/draw_quad.rs
2024-02-22 01:16:42 -05:00

122 lines
3.8 KiB
Rust

use crate::buffer::D3D12Buffer;
use crate::error;
use array_concat::concat_arrays;
use bytemuck::offset_of;
use librashader_runtime::quad::{QuadType, VertexInput};
use windows::core::PCSTR;
use windows::Win32::Graphics::Direct3D::D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP;
use windows::Win32::Graphics::Direct3D12::{
ID3D12Device, ID3D12GraphicsCommandList, ID3D12GraphicsCommandList4, ID3D12Resource,
D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, D3D12_INPUT_ELEMENT_DESC, D3D12_VERTEX_BUFFER_VIEW,
};
use windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT_R32G32_FLOAT;
const OFFSCREEN_VBO_DATA: [VertexInput; 4] = [
VertexInput {
position: [-1.0, -1.0, 0.0, 1.0],
texcoord: [0.0, 1.0],
},
VertexInput {
position: [-1.0, 1.0, 0.0, 1.0],
texcoord: [0.0, 0.0],
},
VertexInput {
position: [1.0, -1.0, 0.0, 1.0],
texcoord: [1.0, 1.0],
},
VertexInput {
position: [1.0, 1.0, 0.0, 1.0],
texcoord: [1.0, 0.0],
},
];
const FINAL_VBO_DATA: [VertexInput; 4] = [
VertexInput {
position: [0.0, 0.0, 0.0, 1.0],
texcoord: [0.0, 1.0],
},
VertexInput {
position: [0.0, 1.0, 0.0, 1.0],
texcoord: [0.0, 0.0],
},
VertexInput {
position: [1.0, 0.0, 0.0, 1.0],
texcoord: [1.0, 1.0],
},
VertexInput {
position: [1.0, 1.0, 0.0, 1.0],
texcoord: [1.0, 0.0],
},
];
static VBO_DATA: &[VertexInput; 8] = &concat_arrays!(OFFSCREEN_VBO_DATA, FINAL_VBO_DATA);
pub(crate) struct DrawQuad {
_buffer: ID3D12Resource,
view: D3D12_VERTEX_BUFFER_VIEW,
}
impl DrawQuad {
pub fn new(device: &ID3D12Device) -> error::Result<DrawQuad> {
let stride = std::mem::size_of::<VertexInput>() as u32;
let size = 2 * std::mem::size_of::<[VertexInput; 4]>() as u32;
let mut buffer = D3D12Buffer::new(device, size as usize)?;
buffer
.map(None)?
.slice
.copy_from_slice(bytemuck::cast_slice(VBO_DATA));
let view = D3D12_VERTEX_BUFFER_VIEW {
BufferLocation: buffer.gpu_address(),
SizeInBytes: size,
StrideInBytes: stride,
};
let buffer = buffer.into_raw();
Ok(DrawQuad {
_buffer: buffer,
view,
})
}
pub fn bind_vertices_for_frame(&self, cmd: &ID3D12GraphicsCommandList) {
unsafe {
cmd.IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
cmd.IASetVertexBuffers(0, Some(&[self.view]));
}
}
// frame uses ID3D12GraphicsCommandList4 for renderpasses, don't need to bother with the cast.
pub fn draw_quad(&self, cmd: &ID3D12GraphicsCommandList4, vbo_type: QuadType) {
let offset = match vbo_type {
QuadType::Offscreen => 0,
QuadType::Final => 4,
};
unsafe { cmd.DrawInstanced(4, 1, offset, 0) }
}
pub fn get_spirv_cross_vbo_desc() -> [D3D12_INPUT_ELEMENT_DESC; 2] {
[
D3D12_INPUT_ELEMENT_DESC {
SemanticName: PCSTR(b"TEXCOORD\0".as_ptr()),
SemanticIndex: 0,
Format: DXGI_FORMAT_R32G32_FLOAT,
InputSlot: 0,
AlignedByteOffset: offset_of!(VertexInput, position) as u32,
InputSlotClass: D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA,
InstanceDataStepRate: 0,
},
D3D12_INPUT_ELEMENT_DESC {
SemanticName: PCSTR(b"TEXCOORD\0".as_ptr()),
SemanticIndex: 1,
Format: DXGI_FORMAT_R32G32_FLOAT,
InputSlot: 0,
AlignedByteOffset: offset_of!(VertexInput, texcoord) as u32,
InputSlotClass: D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA,
InstanceDataStepRate: 0,
},
]
}
}