feat: 添加Shader类和Program类

src/lib.rs

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

src/shader.rs

@@ -0,0 +1,86 @@
+use std::{
+    ptr::{null, null_mut},
+    str::from_utf8,
+};
+
+use gl::{CompileShader, ShaderSource};
+
+
+pub struct Shader {
+    id: gl::types::GLuint,
+}
+
+impl Shader {
+    pub fn new(src: &str, type_: gl::types::GLenum) -> Result<Self, Box<dyn std::error::Error>> {
+        // 编译着色器
+        let id = unsafe { gl::CreateShader(type_) };
+        let c_src = std::ffi::CString::new(src)?;
+        unsafe { ShaderSource(id, 1, &c_src.as_ptr() as _, null()) };
+        unsafe { CompileShader(id) };
+
+        // 检查编译是否成功
+        let mut success = 0;
+        unsafe { gl::GetShaderiv(id, gl::COMPILE_STATUS, &mut success) };
+        if success == 0 {
+            let mut log = [0; 512];
+            unsafe { gl::GetShaderInfoLog(id, 512, core::ptr::null_mut(), log.as_mut_ptr()) };
+            let log_u8: [u8; 512] = unsafe { std::mem::transmute(log) };
+            let e = from_utf8(&log_u8)?;
+            return Err(e.into());
+        }
+
+        Ok(Shader { id: id })
+    }
+}
+
+impl Drop for Shader {
+    fn drop(&mut self) {
+        unsafe {
+            gl::DeleteShader(self.id);
+        }
+    }
+}
+
+pub struct Program {
+    id: gl::types::GLuint,
+}
+
+impl Program {
+    pub fn new() -> Self {
+        let id = unsafe { gl::CreateProgram() };
+        Program { id: id }
+    }
+
+    pub fn attach_shader(&self, shader: &Shader) {
+        unsafe { gl::AttachShader(self.id, shader.id) };
+    }
+
+    pub fn link_program(&self) -> Result<(), Box<dyn std::error::Error>> {
+        // 链接着色器
+        unsafe { gl::LinkProgram(self.id) };
+
+        // 检查链接是否成功
+        let mut success = 0;
+        unsafe { gl::GetProgramiv(self.id, gl::LINK_STATUS, &mut success) };
+        if success == 0 {
+            let mut log = [0; 512];
+            unsafe { gl::GetProgramInfoLog(self.id, 512, null_mut(), log.as_mut_ptr()) };
+            let log_u8: [u8; 512] = unsafe { std::mem::transmute(log) };
+            let e = from_utf8(&log_u8)?;
+            return Err(e.into());
+        }
+        Ok(())
+    }
+
+    pub fn use_program(&self) {
+        unsafe { gl::UseProgram(self.id) };
+    }
+}
+
+impl Drop for Program {
+    fn drop(&mut self) {
+        unsafe {
+            gl::DeleteProgram(self.id);
+        }
+    }
+}