feat: 初步定义vao

src/lib.rs

@@ -1,2 +1,3 @@
 pub mod render_timer;
-pub mod shader;
+pub mod shader;
+pub mod vao;

src/vao.rs

@@ -0,0 +1,104 @@
+use std::os::raw::c_void;
+
+pub struct EBO {
+    id: gl::types::GLuint,
+}
+
+impl EBO {
+    pub fn new(data: &[u32]) -> Self {
+        let mut id = 0;
+        unsafe { gl::GenBuffers(1, &mut id) };
+        unsafe { gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, id) };
+        unsafe {
+            gl::BufferData(
+                gl::ELEMENT_ARRAY_BUFFER,
+                size_of_val(&data) as _,
+                data.as_ptr() as _,
+                gl::STATIC_DRAW,
+            )
+        };
+
+        EBO { id: id }
+    }
+
+    pub fn bind(&self) {
+        unsafe { gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, self.id) };
+    }
+}
+
+pub struct VBO {
+    id: gl::types::GLuint,
+}
+
+impl VBO {
+    pub fn new(data: &[u32]) -> Self {
+        let mut id: u32 = 0;
+        unsafe { gl::GenBuffers(1, &mut id) };
+        unsafe { gl::BindBuffer(gl::ARRAY_BUFFER, id) };
+        unsafe {
+            gl::BufferData(
+                gl::ARRAY_BUFFER,
+                size_of_val(&data) as _,
+                data.as_ptr() as _,
+                gl::STATIC_DRAW,
+            )
+        };
+
+        VBO { id: id }
+    }
+
+    pub fn bind(&self) {
+        unsafe { gl::BindBuffer(gl::ARRAY_BUFFER, self.id) };
+    }
+
+    pub fn add_attrib(// TODO: 迁移到其他地方
+        &self,
+        index: u32,
+        size: i32,
+        type_: u32,
+        normalized: u8,
+        stride: i32,
+        pointer: *const c_void,
+    ) {
+        self.bind();
+
+        unsafe { gl::VertexAttribPointer(index, size, type_, normalized, stride, pointer) };
+        unsafe { gl::EnableVertexAttribArray(index) };
+    }
+}
+
+pub struct VAO {
+    id: gl::types::GLuint,
+    vbo: Option<VBO>,
+    ebo: Option<EBO>,
+}
+
+impl VAO {
+    pub fn new() -> Self {
+        let mut id = 0;
+        unsafe { gl::GenVertexArrays(1, &mut id) };
+        unsafe { gl::BindVertexArray(id) };
+
+        VAO { id: id, vbo: None, ebo: None }
+    }
+
+    pub fn bind(&self) {
+        unsafe { gl::BindVertexArray(self.id) };
+    }
+
+    pub fn new_vbo(&mut self, data:&[u32]) {
+        self.bind();
+
+        self.vbo = Some(VBO::new(data));
+    }
+
+    pub fn new_ebo(&mut self, data:&[u32]) {
+        self.bind();
+
+        self.ebo = Some(EBO::new(data));
+    }
+}
+
+pub struct VertexAttribute {
+    // TODO: 定义
+}