refactor layout.h into single file per Node* classes

engine/node_image_texture.cpp

@@ -0,0 +1,32 @@
+#include "pch.h"
+#include "log.h"
+#include "node_image_texture.h"
+#include "shader.h"
+#include "node_image.h"
+
+Node* NodeImageTexture::clone_instantiate() const
+{
+    return new NodeImageTexture();
+}
+
+void NodeImageTexture::clone_copy(Node* dest) const
+{
+    Node::clone_copy(dest);
+    NodeImageTexture* n = static_cast<NodeImageTexture*>(dest);
+    n->tex = tex;
+}
+
+void NodeImageTexture::draw()
+{
+    using namespace ui;
+    tex.bind();
+    NodeImage::m_sampler.bind(0);
+    glEnable(GL_BLEND);
+    ui::ShaderManager::use(kShader::Texture);
+    ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+    ui::ShaderManager::u_mat4(kShaderUniform::MVP, m_mvp);
+    NodeImage::m_plane.draw_fill();
+    NodeImage::m_sampler.unbind();
+    tex.unbind();
+    glDisable(GL_BLEND);
+}