add texture registering function

egui_glium/src/painter.rs

@@ -250,7 +250,17 @@ impl Painter {
         self.user_textures.push(Some(Default::default()));
         id
     }
-
+    /// register glium texture as egui texture
+    /// Usable for render to image rectangle
+    pub fn register_glium_texture(&mut self,texture:glium::texture::SrgbTexture2d)->egui::TextureId{
+        let id= self.alloc_user_texture();
+        if let egui::TextureId::User(id)=id{
+            if let Some(Some(user_texture))=self.user_textures.get_mut(id as usize){
+                *user_texture=UserTexture{ pixels: vec![], gl_texture: Some(texture) }
+            }
+        }
+        id
+    }
     pub fn set_user_texture(
         &mut self,
         id: egui::TextureId,

egui_web/src/painter.rs

@@ -1,4 +1,5 @@
 use wasm_bindgen::prelude::JsValue;
+use web_sys::WebGlTexture;
 
 pub trait Painter {
     fn as_tex_allocator(&mut self) -> &mut dyn epi::TextureAllocator;

egui_web/src/webgl1.rs

@@ -4,10 +4,7 @@ use {
     web_sys::{WebGlBuffer, WebGlProgram, WebGlRenderingContext, WebGlShader, WebGlTexture},
 };
 
-use egui::{
-    emath::{clamp, vec2},
-    epaint::{Color32, Texture},
-};
+use egui::{emath::{clamp, vec2}, epaint::{Color32, Texture}};
 
 type Gl = WebGlRenderingContext;
 
@@ -190,7 +187,13 @@ impl WebGlPainter {
             }
         }
     }
-
+    pub fn register_webgl_texture(&mut self, texture:WebGlTexture) -> egui::TextureId {
+        let id= self.alloc_user_texture_index();
+            if let Some(Some(user_texture))=self.user_textures.get_mut(id){
+                *user_texture=UserTexture{ size: (0, 0), pixels: vec![], gl_texture: Some(texture) }
+            }
+        egui::TextureId::User(id as u64)
+    }
     fn paint_mesh(&self, mesh: &egui::epaint::Mesh16) -> Result<(), JsValue> {
         debug_assert!(mesh.is_valid());
 

egui_web/src/webgl2.rs

@@ -192,7 +192,13 @@ impl WebGl2Painter {
             }
         }
     }
-
+    pub fn register_webgl_texture(&mut self, texture:WebGlTexture) ->egui::TextureId {
+        let id= self.alloc_user_texture_index();
+        if let Some(Some(user_texture))=self.user_textures.get_mut(id){
+            *user_texture=UserTexture{ size: (0, 0), pixels: vec![], gl_texture: Some(texture) }
+        }
+        egui::TextureId::User(id as u64)
+    }
     fn paint_mesh(&self, mesh: &egui::epaint::Mesh16) -> Result<(), JsValue> {
         debug_assert!(mesh.is_valid());