add GL/Buffer

common/gl_obj.hh

@@ -0,0 +1,89 @@
+#pragma once
+
+#include <cassert>
+#include <memory>
+#include <utility>
+
+#include <GL/glew.h>
+
+#include "nf7.hh"
+
+#include "common/factory.hh"
+#include "common/future.hh"
+#include "common/mutex.hh"
+
+
+namespace nf7::gl {
+
+template <typename T>
+class Obj final {
+ public:
+  Obj() = delete;
+  template <typename... Args>
+  Obj(const std::shared_ptr<nf7::Context>& ctx, GLuint id, Args&&... args) noexcept :
+      ctx_(ctx), id_(id? id: T::Gen()), meta_(std::forward<Args>(args)...) {
+  }
+  ~Obj() noexcept {
+    ctx_->env().ExecGL(ctx_, [id = id_]() { T::Delete(id); });
+  }
+  Obj(const Obj&) = delete;
+  Obj(Obj&&) = delete;
+  Obj& operator=(const Obj&) = delete;
+  Obj& operator=(Obj&&) = delete;
+
+  GLuint id() const noexcept { return id_; }
+
+  T& meta() noexcept { return meta_; }
+  const T& meta() const noexcept { return meta_; }
+
+ private:
+  std::shared_ptr<nf7::Context> ctx_;
+
+  GLuint id_;
+  T meta_;
+};
+
+
+struct Obj_BufferMeta final {
+ public:
+  Obj_BufferMeta() = delete;
+  Obj_BufferMeta(GLenum t) noexcept : type(t) {
+  }
+
+  const GLenum type;
+
+  size_t   size = 0;
+  uint8_t* ptr  = nullptr;  // address returned by glMapBuffer or nullptr
+
+  static GLuint Gen() noexcept {
+    GLuint id;
+    glGenBuffers(1, &id);
+    return id;
+  }
+  static void Delete(GLuint id) noexcept {
+    glDeleteBuffers(1, &id);
+  }
+};
+using Buffer        = Obj<Obj_BufferMeta>;
+using BufferFactory = AsyncFactory<nf7::Mutex::Resource<std::shared_ptr<Buffer>>>;
+
+
+struct Obj_TextureMeta final {
+ public:
+  GLenum type;
+  GLenum format;
+  uint32_t w, h, d;
+
+  static GLuint Gen() noexcept {
+    GLuint id;
+    glGenTextures(1, &id);
+    return id;
+  }
+  static void Delete(GLuint id) noexcept {
+    glDeleteTextures(1, &id);
+  }
+};
+using Texture        = Obj<Obj_TextureMeta>;
+using TextureFactory = AsyncFactory<nf7::Mutex::Resource<std::shared_ptr<Texture>>>;
+
+}  // namespace nf7::gl