Route framebuffer texture copies through GL backend

src/node_stroke_preview.cpp

@@ -8,6 +8,7 @@
 #include "app.h"
 #include "paint_renderer/compositor.h"
 #include "renderer_gl/opengl_capabilities.h"
+#include "util.h"
 #include <algorithm>
 #include <cstdint>
 
@@ -208,8 +209,7 @@ glm::vec4 NodeStrokePreview::stroke_draw_samples(
     if (copy_stroke_destination)
     {
         // this is also used by the mixer
-        glCopyTexSubImage2D(pp::renderer::gl::texture_2d_target(), 0, tex_pos.x, tex_pos.y,
-            tex_pos.x, tex_pos.y, tex_sz.x, tex_sz.y);
+        copy_framebuffer_to_texture_2d(tex_pos.x, tex_pos.y, tex_pos.x, tex_pos.y, tex_sz.x, tex_sz.y);
     }
 
     if (P.size() == 4)
@@ -432,9 +432,7 @@ void NodeStrokePreview::draw_stroke_immediate()
         // copy raw stroke to tex
         glActiveTexture(pp::renderer::gl::active_texture_unit(1U));
         m_tex_dual.bind();
-        glCopyTexSubImage2D(
-            pp::renderer::gl::texture_2d_target(),
-            0,
+        copy_framebuffer_to_texture_2d(
             0,
             0,
             0,
@@ -453,9 +451,7 @@ void NodeStrokePreview::draw_stroke_immediate()
     m_plane.draw_fill();
     //m_rtt.clear({ .3f, .3f, .3f, 1.f });
     m_tex_background.bind();
-    glCopyTexSubImage2D(
-        pp::renderer::gl::texture_2d_target(),
-        0,
+    copy_framebuffer_to_texture_2d(
         0,
         0,
         0,
@@ -508,9 +504,7 @@ void NodeStrokePreview::draw_stroke_immediate()
     // copy raw stroke to tex
     glActiveTexture(pp::renderer::gl::active_texture_unit(1U));
     m_tex.bind();
-    glCopyTexSubImage2D(
-        pp::renderer::gl::texture_2d_target(),
-        0,
+    copy_framebuffer_to_texture_2d(
         0,
         0,
         0,
@@ -564,9 +558,7 @@ void NodeStrokePreview::draw_stroke_immediate()
 
     // copy the result to the actual preview
     m_tex_preview.bind();
-    glCopyTexSubImage2D(
-        pp::renderer::gl::texture_2d_target(),
-        0,
+    copy_framebuffer_to_texture_2d(
         0,
         0,
         0,