remove async task from texture and sampler binding, but add render thread assert

src/texture.cpp

@@ -118,11 +118,13 @@ void Texture2D::destroy()
 
 void Texture2D::bind() const
 {
+    assert(App::I->is_render_thread());
     glBindTexture(GL_TEXTURE_2D, m_tex);
 }
 
 void Texture2D::unbind() const
 {
+    assert(App::I->is_render_thread());
     glBindTexture(GL_TEXTURE_2D, 0);
 }
 
@@ -201,21 +203,17 @@ void Sampler::set_border(glm::vec4 rgba)
 }
 void Sampler::bind(int unit) const
 {
-    App::I->render_task([=]
-    {
-        current_unit = unit;
+    assert(App::I->is_render_thread());
+    current_unit = unit;
 #if USE_SAMPLER
-        glBindSampler(unit, id);
+    glBindSampler(unit, id);
 #endif // USE_SAMPLER
-    });
 }
 void Sampler::unbind()
 {
-    App::I->render_task([=]
-    {
+    assert(App::I->is_render_thread());
 #if USE_SAMPLER
-        glBindSampler(current_unit, 0);
+    glBindSampler(current_unit, 0);
 #endif // USE_SAMPLER
-    });
 }