a cpu/gpu soft renderer in rust
使用纯Rust编写的3D软渲染器。
只有一个例子：examples/sandbox.rs，用
cargo run --example sandbox运行。
使用WSAD前后左右移动相机，使用Q上升相机，E下降相机。
本工程由两种软渲染：纯粹为了在CPU上快速运行的CPU软渲染(./src/cpu_renderer.rs)，以及模拟GPU原理的GPU软渲染(./src/gpu_renderer.rs)。使用features可以指定运行某种：
cargo run --example sandbox --features cpu
cargo run --example sandbox --features gpu默认是CPU渲染。
书籍：
视频：
齐次空间裁剪:
投影矩阵推导：
透视投影矫正：
其他:
if outcode & TOP != 0 {
// 这里是不是应该为 p.x = pt1.x + (pt2.x - pt1.x) * (rect_max.y - pt1.y) / (pt2.y - pt1.y);
p.x = p1.x + (pt2.x - pt1.x) * (rect_max.y - pt1.y) / (pt2.y - pt1.y);
p.y = rect_max.y;
} else if outcode & BOTTOM != 0 {
// 这里是不是应该为 p.x = pt1.x + (pt2.x - pt1.x) * (rect_min.y - pt1.y) / (pt2.y - pt1.y);
p.x = p1.x + (pt2.x - pt1.x) * (rect_min.y - pt1.y) / (pt2.y - pt1.y);
p.y = rect_min.y;
} else if outcode & RIGHT != 0 {
p.y = pt1.y + (pt2.y - pt1.y) * (rect_max.x - pt1.x) / (pt2.x - pt1.x);
p.x = rect_max.x;
} else if outcode & LEFT != 0 {
p.y = pt1.y + (pt2.y - pt1.y) * (rect_min.x - pt1.x) / (pt2.x - pt1.x);
p.x = rect_min.x;
}
impl PureElemImage<f32> {
pub fn new(w: u32, h: u32) -> Self {
Self {
data: vec![std::f32::MAX; (w * h) as usize],
w,
h,
}
}我理解的应该是看向Z的负方向，z值越大离相机越近（renderer.rs中深度测试也是保留深度大的值）。
if depth_attachment.get(x, y) <= z {
let mut attr = vertex.attributes;
shader::attributes_foreach(&mut attr, |value| value * z);
// call pixel shading function to get shading color
let color = shading(&vertex.attributes, uniforms, texture_storage);
color_attachment.set(x, y, &color);
depth_attachment.set(x, y, z);
}那么初始值是否应该被设置为浮点最小值？（cpu_renderer.rs和gpu_renderer.rs中的clear_depth也是这么做的）。
fn clear_depth(&mut self) {
self.depth_attachment.clear(f32::MIN);
} pub fn inverse(&self) -> Quaternion {
self.conjugate() / self.length()
}
是不是应该为self.conjugate() / self.length_square() ?
// camera.rs
mpl Frustum {
#[rustfmt::skip]
pub fn new(near: f32, far: f32, aspect: f32, fovy: f32) -> Self {
// ...
} else { // when in GPU, [we use opengl matrix](http://www.songho.ca/opengl/gl_projectionmatrix.html)
let half_w = near * fovy.tan();
let half_h = half_w / aspect;
let near = near.abs();
let far = far.abs();
// with far plane, clamp x,y,z in [-1, 1]
math::Mat4::from_row(&[
near / half_w, 0.0, 0.0, 0.0,
0.0, near / half_h, 0.0, 0.0,
0.0, 0.0, far + near / (near - far), 2.0 * far * near / (near - far),
0.0, 0.0, -1.0, 0.0,
])请问第三行第三列是否应该是(far + near) / (near - far)？
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