concinnity_render/uniforms/
geometry.rs

1//! The passes that draw their own geometry into the main target: projected
2//! decals, world-space lines, and the GPU particle system.
3
4/// Per-frame view inputs to the projected-decal pass. Matches `DecalView` in
5/// `shaders/decal.slang`. 144 bytes.
6#[derive(Copy, Clone, bytemuck::NoUninit)]
7#[repr(C)]
8pub struct DecalView {
9    /// View-projection matrix used by the main pass (jittered when TAA is on).
10    pub vp: [[f32; 4]; 4],
11    /// Inverse of `vp`. The fragment shader uses it to reconstruct world space
12    /// from the depth attachment at each pixel.
13    pub inv_vp: [[f32; 4]; 4],
14    /// HDR target dimensions in pixels: drives the screen->NDC conversion.
15    pub viewport: [f32; 2],
16    /// Padding so the field layout matches the shader-side struct.
17    pub _pad: [f32; 2],
18}
19
20/// Per-decal uniforms uploaded before each draw. Matches `DecalParams` in
21/// `shaders/decal.slang`. 160 bytes (two float4x4s, a float4 tint, four scalars).
22#[derive(Copy, Clone, bytemuck::NoUninit)]
23#[repr(C)]
24pub struct DecalParams {
25    /// Model matrix, column-major.
26    pub model: [[f32; 4]; 4],
27    /// Inverse model matrix, column-major.
28    pub inv_model: [[f32; 4]; 4],
29    /// Linear RGBA tint multiplied into the sampled image.
30    pub tint: [f32; 4],
31    /// Exponent of the edge fade curve.
32    pub fade_pow: f32,
33    /// Padding so the field layout matches the shader-side struct.
34    pub _pad0: f32,
35    /// Padding so the field layout matches the shader-side struct.
36    pub _pad1: f32,
37    /// Padding so the field layout matches the shader-side struct.
38    pub _pad2: f32,
39}
40
41/// Per-frame view inputs to the line pass. Matches `LineView` in
42/// `shaders/line.slang`. 80 bytes.
43#[derive(Copy, Clone, bytemuck::NoUninit)]
44#[repr(C)]
45pub struct LineView {
46    /// View-projection matrix used by the main pass (jittered when TAA is on),
47    /// so a line lands on the same pixel the geometry it sits on did.
48    pub vp: [[f32; 4]; 4],
49    /// Alpha multiplier applied where a line falls behind scene geometry.
50    pub occluded_alpha: f32,
51    /// Padding so the field layout matches the shader-side struct.
52    pub _pad: [f32; 3],
53}
54
55/// Per-frame view inputs to the particle render pass. Matches `ParticleView` in
56/// `shaders/particle.slang`. 96 bytes.
57#[derive(Copy, Clone, bytemuck::NoUninit)]
58#[repr(C)]
59pub struct ParticleView {
60    /// View-projection matrix used by the main pass.
61    pub vp: [[f32; 4]; 4],
62    /// World-space camera right vector: drives the first billboard axis. The
63    /// shader reads a float4 whose trailing component is unused padding.
64    pub cam_right: [f32; 3],
65    /// Padding so the field layout matches the shader-side struct.
66    pub _pad0: f32,
67    /// World-space camera up vector: drives the second billboard axis.
68    pub cam_up: [f32; 3],
69    /// Padding so the field layout matches the shader-side struct.
70    pub _pad1: f32,
71}
72
73/// One particle slot in the pool the simulation kernel writes and the render
74/// pair reads. Matches `Particle` in `shaders/particle_types.slang`, which
75/// spells the same 32 bytes as two float4 lanes.
76#[derive(Copy, Clone, Default)]
77#[repr(C)]
78pub struct GpuParticle {
79    /// World-space position.
80    pub position: [f32; 3],
81    /// Seconds since the particle spawned.
82    pub age: f32,
83    /// World-space velocity in units per second.
84    pub velocity: [f32; 3],
85    /// Total lifetime in seconds.
86    pub lifetime: f32,
87}
88
89/// Per-dispatch parameters for the `rt_skin` compute kernel, which deforms one
90/// skinned object's bind-pose vertices into the shared deformed buffer the RT
91/// acceleration structure traces. Matches `SkinParams` in `rt_skin.slang`.
92///
93/// Metal writes it to buffer(3), Vulkan pushes it, DirectX takes it as root
94/// constants at b0.
95#[repr(C)]
96#[derive(Clone, Copy, bytemuck::NoUninit)]
97pub struct SkinParams {
98    /// First vertex of this object's region in the shared vertex buffer.
99    pub vertex_base: u32,
100    /// Vertices this dispatch deforms.
101    pub vertex_count: u32,
102    /// Palette size; joint indices are clamped below it.
103    pub joint_count: u32,
104    /// Morph targets in the delta buffer; zero when the object has none.
105    pub target_count: u32,
106}
concinnity_render/uniforms/geometry.rs

concinnity_render/uniforms/
geometry.rs
