[gtk+] gsk: Split surface upload from texture creation

[Emmanuele Bassi <ebassi src gnome org>]

commit 8807f23f76d3cdd8aea0bff147e8e3a9941f476c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Jul 12 11:15:45 2016 +0100

    gsk: Split surface upload from texture creation
    
    We're going to need a method to create textures without a surface.

 gsk/gskgldriver.c        |   35 ++++++++++++++++++++++++++++-------
 gsk/gskgldriverprivate.h |    7 +++++--
 gsk/gskglrenderer.c      |    6 ++++--
 3 files changed, 37 insertions(+), 11 deletions(-)
---
diff --git a/gsk/gskgldriver.c b/gsk/gskgldriver.c
index 0ed1493..57e8bfe 100644
--- a/gsk/gskgldriver.c
+++ b/gsk/gskgldriver.c
@@ -11,6 +11,8 @@ typedef struct {
   GLuint texture_id;
   int width;
   int height;
+  GLuint min_filter;
+  GLuint mag_filter;
 } Texture;
 
 typedef struct {
@@ -197,12 +199,13 @@ gsk_gl_driver_create_texture (GskGLDriver     *driver,
                               int              width,
                               int              height,
                               int              min_filter,
-                              int              mag_filter,
-                              cairo_surface_t *surface)
+                              int              mag_filter)
 {
   guint texture_id;
   Texture t;
 
+  g_return_val_if_fail (GSK_IS_GL_DRIVER (driver), -1);
+
   glGenTextures (1, &texture_id);
   glBindTexture (GL_TEXTURE_2D, texture_id);
 
@@ -211,14 +214,11 @@ gsk_gl_driver_create_texture (GskGLDriver     *driver,
   glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
   glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
 
-  gdk_cairo_surface_upload_to_gl (surface, GL_TEXTURE_2D, width, height, NULL);
-
-  if (min_filter != GL_NEAREST)
-    glGenerateMipmap (GL_TEXTURE_2D);
-
   t.texture_id = texture_id;
   t.width = width;
   t.height = height;
+  t.min_filter = min_filter;
+  t.mag_filter = mag_filter;
   g_array_append_val (driver->textures, t);
 
   return texture_id;
@@ -367,3 +367,24 @@ gsk_gl_driver_bind_vao (GskGLDriver *driver,
       driver->bound_vao = v;
     }
 }
+
+void
+gsk_gl_driver_render_surface_to_texture (GskGLDriver     *driver,
+                                         cairo_surface_t *surface,
+                                         int              texture_id)
+{
+  Texture *t;
+
+  g_return_if_fail (GSK_IS_GL_DRIVER (driver));
+
+  t = gsk_gl_driver_get_texture (driver, texture_id);
+  if (t == NULL)
+    return;
+
+  glBindTexture (GL_TEXTURE_2D, t->texture_id);
+
+  gdk_cairo_surface_upload_to_gl (surface, GL_TEXTURE_2D, t->width, t->height, NULL);
+
+  if (t->min_filter != GL_NEAREST)
+    glGenerateMipmap (GL_TEXTURE_2D);
+}
diff --git a/gsk/gskgldriverprivate.h b/gsk/gskgldriverprivate.h
index 53f97cd..9fc1d8a 100644
--- a/gsk/gskgldriverprivate.h
+++ b/gsk/gskgldriverprivate.h
@@ -25,8 +25,7 @@ int             gsk_gl_driver_create_texture            (GskGLDriver     *driver
                                                          int              width,
                                                          int              height,
                                                          int              min_filter,
-                                                         int              mag_filter,
-                                                         cairo_surface_t *surface);
+                                                         int              mag_filter);
 int             gsk_gl_driver_create_vao_for_quad       (GskGLDriver     *driver,
                                                          int              position_id,
                                                          int              uv_id,
@@ -40,6 +39,10 @@ void            gsk_gl_driver_bind_mask_texture         (GskGLDriver     *driver
 void            gsk_gl_driver_bind_vao                  (GskGLDriver     *driver,
                                                          int              vao_id);
 
+void            gsk_gl_driver_render_surface_to_texture (GskGLDriver     *driver,
+                                                         cairo_surface_t *surface,
+                                                         int              texture_id);
+
 G_END_DECLS
 
 #endif /* __GSK_GL_DRIVER_PRIVATE_H__ */
diff --git a/gsk/gskglrenderer.c b/gsk/gskglrenderer.c
index 6a787d1..9e070e6 100644
--- a/gsk/gskglrenderer.c
+++ b/gsk/gskglrenderer.c
@@ -719,8 +719,10 @@ gsk_gl_renderer_add_render_item (GskGLRenderer *self,
                                                               bounds.size.width,
                                                               bounds.size.height,
                                                               self->gl_min_filter,
-                                                              self->gl_mag_filter,
-                                                              surface);
+                                                              self->gl_mag_filter);
+  gsk_gl_driver_render_surface_to_texture (self->gl_driver,
+                                           surface,
+                                           item.render_data.texture_id);
 
   GSK_NOTE (OPENGL, g_print ("Adding node <%s>[%p] to render items\n",
                              node->name != NULL ? node->name : "unnamed",