Add conditionalrender rust shader

Author: LegNeato

shaders/rust/Cargo.lock

@@ -77,6 +77,7 @@ members = [
     "computeparticles/particle",
     "distancefieldfonts/bitmap",
     "distancefieldfonts/sdf",
+    "conditionalrender/model",
 ]
 
 [workspace.dependencies]

shaders/rust/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "conditionalrender-model"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+spirv-std = { workspace = true }
+
+[lib]
+crate-type = ["dylib"]

shaders/rust/conditionalrender/model.frag.spv

@@ -0,0 +1,71 @@
+#![cfg_attr(target_arch = "spirv", no_std)]
+#![allow(clippy::missing_safety_doc)]
+
+use spirv_std::{spirv, glam::{vec3, vec4, Mat3, Mat4, Vec3, Vec4}, num_traits::Float};
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct Ubo {
+    pub projection: Mat4,
+    pub view: Mat4,
+    pub model: Mat4,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct Node {
+    pub matrix: Mat4,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct PushBlock {
+    pub base_color_factor: Vec4,
+}
+
+#[spirv(vertex)]
+pub fn main_vs(
+    in_pos: Vec3,
+    in_normal: Vec3,
+    _in_color: Vec3,
+    #[spirv(uniform, descriptor_set = 0, binding = 0)] ubo: &Ubo,
+    #[spirv(uniform, descriptor_set = 1, binding = 0)] node: &Node,
+    #[spirv(push_constant)] material: &PushBlock,
+    #[spirv(position)] out_position: &mut Vec4,
+    out_normal: &mut Vec3,
+    out_color: &mut Vec3,
+    out_view_vec: &mut Vec3,
+    out_light_vec: &mut Vec3,
+) {
+    *out_normal = in_normal;
+    *out_color = material.base_color_factor.truncate();
+    let pos = vec4(in_pos.x, in_pos.y, in_pos.z, 1.0);
+    *out_position = ubo.projection * ubo.view * ubo.model * node.matrix * pos;
+
+    let normal_matrix = Mat3::from_mat4(ubo.view * ubo.model * node.matrix);
+    *out_normal = normal_matrix * in_normal;
+
+    let localpos = ubo.view * ubo.model * node.matrix * pos;
+    let light_pos = vec3(10.0, -10.0, 10.0);
+    *out_light_vec = light_pos - localpos.truncate();
+    *out_view_vec = -localpos.truncate();
+}
+
+#[spirv(fragment)]
+pub fn main_fs(
+    in_normal: Vec3,
+    in_color: Vec3,
+    in_view_vec: Vec3,
+    in_light_vec: Vec3,
+    out_frag_color: &mut Vec4,
+) {
+    let n = in_normal.normalize();
+    let l = in_light_vec.normalize();
+    let v = in_view_vec.normalize();
+    let r = (-l).reflect(n);
+    let ambient = vec3(0.1, 0.1, 0.1);
+    let diffuse = n.dot(l).max(0.0) * vec3(1.0, 1.0, 1.0);
+    let specular = r.dot(v).max(0.0).powf(16.0) * vec3(0.75, 0.75, 0.75);
+    let final_color = (ambient + diffuse) * in_color + specular;
+    *out_frag_color = vec4(final_color.x, final_color.y, final_color.z, 1.0);
+}