feat(engine): add vertex coloring

1 files changed, 101 insertions, 0 deletions

diff --git a/engine/src/vertex.rs b/engine/src/vertex.rs
new file mode 100644
index 0000000..e03eacb
--- /dev/null
+++ b/engine/src/vertex.rs
@@ -0,0 +1,101 @@
+use std::mem::size_of;
+
+use crate::color::Color;
+use crate::vector::Vec3;
+
+#[derive(Debug)]
+#[repr(C)]
+pub struct Vertex
+{
+    pos: Vec3<f32>,
+    color: Color<f32>,
+}
+
+#[derive(Debug, Default)]
+pub struct Builder
+{
+    pos: Option<Vec3<f32>>,
+    color: Option<Color<f32>>,
+}
+
+impl Builder
+{
+    #[must_use]
+    pub fn new() -> Self
+    {
+        Self {
+            pos: None,
+            color: None,
+        }
+    }
+
+    #[must_use]
+    pub fn pos(mut self, pos: Vec3<f32>) -> Self
+    {
+        self.pos = Some(pos);
+
+        self
+    }
+
+    #[must_use]
+    pub fn color(mut self, color: Color<f32>) -> Self
+    {
+        self.color = Some(color);
+
+        self
+    }
+
+    #[must_use]
+    pub fn build(self) -> Option<Vertex>
+    {
+        let pos = self.pos?;
+        let color = self.color?;
+
+        Some(Vertex { pos, color })
+    }
+}
+
+impl Vertex
+{
+    pub(crate) fn attrs() -> &'static [Attribute]
+    {
+        &[
+            Attribute {
+                index: 0,
+                component_type: AttributeComponentType::Float,
+                component_cnt: AttributeComponentCnt::Three,
+                component_size: size_of::<f32>(),
+            },
+            Attribute {
+                index: 1,
+                component_type: AttributeComponentType::Float,
+                component_cnt: AttributeComponentCnt::Three,
+                component_size: size_of::<f32>(),
+            },
+        ]
+    }
+}
+
+pub(crate) struct Attribute
+{
+    pub(crate) index: usize,
+    pub(crate) component_type: AttributeComponentType,
+    pub(crate) component_cnt: AttributeComponentCnt,
+    pub(crate) component_size: usize,
+}
+
+pub(crate) enum AttributeComponentType
+{
+    Float,
+}
+
+#[derive(Debug, Clone, Copy)]
+#[repr(u32)]
+#[allow(dead_code)]
+pub(crate) enum AttributeComponentCnt
+{
+    One = 1,
+    Two = 2,
+    Three = 3,
+    Four = 4,
+}