add load image from url

src/node_image.cpp

@@ -2,6 +2,7 @@
 #include "log.h"
 #include "node_image.h"
 #include "shader.h"
+#include "app.h"
 
 Plane NodeImage::m_plane;
 Sampler NodeImage::m_sampler;
@@ -30,6 +31,9 @@ void NodeImage::clone_copy(Node* dest) const
     n->m_sz = m_sz;
     n->m_path = m_path;
     n->m_tex_id = m_tex_id;
+    n->m_url = m_url;
+    n->m_remote_texture = m_remote_texture;
+    n->m_autosize = m_autosize;
 }
 
 void NodeImage::create()
@@ -64,6 +68,9 @@ void NodeImage::parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* at
         m_path = attr->Value();
         m_tex_id = const_hash(attr->Value());
         break;
+    case kAttribute::Url:
+        m_url = attr->Value();
+        break;
     case kAttribute::Region:
     {
         glm::vec4 v;
@@ -85,9 +92,13 @@ void NodeImage::parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* at
 
 void NodeImage::draw()
 {
-    TextureManager::get(m_tex_id).bind();
+    m_remote_texture ? 
+        m_remote_texture->bind() : 
+        TextureManager::get(m_tex_id).bind();
+
     auto& sampler = m_use_mipmaps ? m_sampler_mips : m_sampler;
     sampler.bind(0);
+
     glEnable(GL_BLEND);
     if (m_use_atlas)
     {
@@ -103,7 +114,6 @@ void NodeImage::draw()
     ShaderManager::u_mat4(kShaderUniform::MVP, m_mvp * glm::scale(glm::vec3(m_scale, 1.f)));
     m_plane.draw_fill();
     sampler.unbind();
-    TextureManager::get(m_tex_id).unbind();
     glDisable(GL_BLEND);
 }
 
@@ -122,3 +132,36 @@ bool NodeImage::set_image(const std::string& path)
     }
     return false;
 }
+
+void NodeImage::load_url(const std::string& url)
+{
+    m_remote_asset = std::make_shared<Asset>();
+    m_remote_asset->open_url_async(url, 
+        [this] (float progress) -> bool {
+            return true;
+        },
+        [this] (bool success) {
+            if (success)
+            {
+                int w, h, c;
+                uint8_t* rgba = stbi_load_from_memory(m_remote_asset->m_data, m_remote_asset->m_len, &w, &h, &c, 4);
+                m_remote_texture = std::make_shared<Texture2D>();
+                m_remote_texture->create(w, h, GL_RGBA8, GL_RGBA, rgba);
+                m_remote_texture->auto_destroy = true;
+                if (m_use_mipmaps)
+                    m_remote_texture->create_mipmaps();
+                delete rgba;
+                if (m_autosize)
+                    SetAspectRatio(w / h);
+            }
+            m_remote_asset.reset();
+        }
+    );
+}
+
+void NodeImage::added(Node* parent)
+{
+    Node::added(parent);
+    if (!m_url.empty() && root() == App::I->layout.get(App::I->main_id))
+        load_url(m_url);
+}