Rewrite the maths & uniform API

citro3d/Cargo.toml

@@ -6,6 +6,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+glam = { version = "0.24.2", optional = true }
 approx = { version = "0.5.1", optional = true }
 bitflags = "1.3.2"
 bytemuck = { version = "1.10.0", features = ["extern_crate_std"] }
@@ -17,9 +18,11 @@ document-features = "0.2.7"
 libc = "0.2.125"
 
 [features]
-default = []
+default = ["glam"]
 ## Enable this feature to use the `approx` crate for comparing vectors and matrices.
 approx = ["dep:approx"]
+# Enable for glam support in uniforms
+glam = ["dep:glam"]
 
 [dev-dependencies]
 test-runner = { git = "https://github.com/rust3ds/test-runner.git" }

citro3d/src/lib.rs

@@ -192,8 +192,8 @@ impl Instance {
     /// let mtx = Matrix::identity();
     /// instance.bind_vertex_uniform(idx, &mtx);
     /// ```
-    pub fn bind_vertex_uniform(&mut self, index: uniform::Index, uniform: impl Uniform) {
-        uniform.bind(self, shader::Type::Vertex, index);
+    pub fn bind_vertex_uniform(&mut self, index: uniform::Index, uniform: impl Into<Uniform>) {
+        uniform.into().bind(self, shader::Type::Vertex, index);
     }
 
     /// Bind a uniform to the given `index` in the geometry shader for the next draw call.
@@ -210,8 +210,8 @@ impl Instance {
     /// let mtx = Matrix::identity();
     /// instance.bind_geometry_uniform(idx, &mtx);
     /// ```
-    pub fn bind_geometry_uniform(&mut self, index: uniform::Index, uniform: impl Uniform) {
-        uniform.bind(self, shader::Type::Geometry, index);
+    pub fn bind_geometry_uniform(&mut self, index: uniform::Index, uniform: impl Into<Uniform>) {
+        uniform.into().bind(self, shader::Type::Geometry, index);
     }
 
     /// Retrieve the [`TexEnv`] for the given stage, initializing it first if necessary.

citro3d/src/math.rs

@@ -9,16 +9,56 @@ mod ops;
 mod projection;
 
 pub use fvec::{FVec, FVec3, FVec4};
-pub use matrix::{Matrix, Matrix3, Matrix4};
+pub use matrix::Matrix4;
 pub use projection::{
     AspectRatio, ClipPlanes, CoordinateOrientation, Orthographic, Perspective, Projection,
     ScreenOrientation, StereoDisplacement,
 };
 
 /// A 4-vector of `u8`s.
+///
+/// # Layout
+/// Uses the PICA layout of WZYX
 #[doc(alias = "C3D_IVec")]
+#[repr(transparent)]
+#[derive(Clone, Copy, PartialEq, Eq)]
 pub struct IVec(citro3d_sys::C3D_IVec);
 
+impl IVec {
+    pub fn new(x: u8, y: u8, z: u8, w: u8) -> Self {
+        Self(unsafe { citro3d_sys::IVec_Pack(x, y, z, w) })
+    }
+    pub fn as_raw(&self) -> &citro3d_sys::C3D_IVec {
+        &self.0
+    }
+    pub fn x(self) -> u8 {
+        self.0 as u8
+    }
+    pub fn y(self) -> u8 {
+        (self.0 >> 8) as u8
+    }
+    pub fn z(self) -> u8 {
+        (self.0 >> 16) as u8
+    }
+    pub fn w(self) -> u8 {
+        (self.0 >> 24) as u8
+    }
+}
+
 /// A quaternion, internally represented the same way as [`FVec`].
 #[doc(alias = "C3D_FQuat")]
 pub struct FQuat(citro3d_sys::C3D_FQuat);
+
+#[cfg(test)]
+mod tests {
+    use super::IVec;
+
+    #[test]
+    fn ivec_getters_work() {
+        let iv = IVec::new(1, 2, 3, 4);
+        assert_eq!(iv.x(), 1);
+        assert_eq!(iv.y(), 2);
+        assert_eq!(iv.z(), 3);
+        assert_eq!(iv.w(), 4);
+    }
+}

citro3d/src/math/fvec.rs

@@ -3,8 +3,15 @@
 use std::fmt;
 
 /// A vector of `f32`s.
+///
+/// # Layout
+/// Note that this matches the PICA layout so is actually WZYX, this means using it
+/// in vertex data as an attribute it will be reversed
+///
+/// It is guaranteed to have the same layout as [`citro3d_sys::C3D_FVec`] in memory
 #[derive(Clone, Copy)]
 #[doc(alias = "C3D_FVec")]
+#[repr(transparent)]
 pub struct FVec<const N: usize>(pub(crate) citro3d_sys::C3D_FVec);
 
 /// A 3-vector of `f32`s.
@@ -243,6 +250,32 @@ impl FVec3 {
     }
 }
 
+#[cfg(feature = "glam")]
+impl From<glam::Vec4> for FVec4 {
+    fn from(value: glam::Vec4) -> Self {
+        Self::new(value.x, value.y, value.z, value.w)
+    }
+}
+#[cfg(feature = "glam")]
+impl From<glam::Vec3> for FVec3 {
+    fn from(value: glam::Vec3) -> Self {
+        Self::new(value.x, value.y, value.z)
+    }
+}
+#[cfg(feature = "glam")]
+impl From<FVec4> for glam::Vec4 {
+    fn from(value: FVec4) -> Self {
+        glam::Vec4::new(value.x(), value.y(), value.z(), value.w())
+    }
+}
+
+#[cfg(feature = "glam")]
+impl From<FVec3> for glam::Vec3 {
+    fn from(value: FVec3) -> Self {
+        glam::Vec3::new(value.x(), value.y(), value.z())
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use approx::assert_abs_diff_eq;