diff --git a/core/rhi/opengl/render_target_opengl.cpp b/core/rhi/opengl/render_target_opengl.cpp
index fec7ae7..cc8c078 100644
--- a/core/rhi/opengl/render_target_opengl.cpp
+++ b/core/rhi/opengl/render_target_opengl.cpp
@@ -70,10 +70,7 @@ GLint to_internal_format(texture_format format) {
     return 0;
 }
 
-void render_target_opengl::init(int width, int height, texture_format format) {
-    width_ = width;
-    height_ = height;
-
+void render_target_opengl::on_init(int width, int height, texture_format format) {
     glGenFramebuffers(1, &fbo_);
     CHECK_GL_ERRORS
     glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
diff --git a/core/rhi/opengl/render_target_opengl.h b/core/rhi/opengl/render_target_opengl.h
index 3a9ae48..debdfcb 100644
--- a/core/rhi/opengl/render_target_opengl.h
+++ b/core/rhi/opengl/render_target_opengl.h
@@ -4,7 +4,6 @@
 
 class render_target_opengl : public render_target {
 public:
-    void init(int width, int height, texture_format format) override;
 
     ~render_target_opengl() override;
 
@@ -18,6 +17,7 @@ public:
     void unlock() override;
 
 protected:
+    void on_init(int width, int height, texture_format format) override;
     void on_resize(int width, int height) override;
 
 private:
diff --git a/core/rhi/render_resource.cpp b/core/rhi/render_resource.cpp
deleted file mode 100644
index 86bef95..0000000
--- a/core/rhi/render_resource.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include "render_resource.h"
diff --git a/core/rhi/render_target.cpp b/core/rhi/render_target.cpp
deleted file mode 100644
index 6625d95..0000000
--- a/core/rhi/render_target.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include "render_target.h"
diff --git a/core/rhi/render_target.h b/core/rhi/render_target.h
index e04c31c..3a4b737 100644
--- a/core/rhi/render_target.h
+++ b/core/rhi/render_target.h
@@ -14,7 +14,11 @@ public:
     [[nodiscard]] int get_height() const override { return height_; }
     [[nodiscard]] int get_width() const override { return width_; }
 
-    virtual void init(int width, int height, texture_format format) = 0;
+    void init(const int width, const int height, const texture_format format) {
+        width_ = width;
+        height_ = height;
+        on_init(width, height, format);
+    }
 
     virtual void resize(const int width, const int height) {
         if (width_ == width && height_ == height)
@@ -34,6 +38,7 @@ public:
     std::function<void(std::shared_ptr<render_resource>)> on_resize_callback;
 
 protected:
+    virtual void on_init(int width, int height, texture_format format) = 0;
     virtual void on_resize(int width, int height) = 0;
 
     int width_ = 0;
diff --git a/core/rhi/shader.cpp b/core/rhi/shader.cpp
deleted file mode 100644
index 1ff07ac..0000000
--- a/core/rhi/shader.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include "shader.h"
diff --git a/core/rhi/texture.cpp b/core/rhi/texture.cpp
deleted file mode 100644
index bf221e1..0000000
--- a/core/rhi/texture.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include "texture.h"