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gdkgl: Use vfunc For Uploading Textures

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As the alignments, strides and image formats may be different across
platforms, make the texture upload a vfunc to allow backends to override
the GL commands for uploading textures for the software implementation for
gdk_gl_texture_from_surface(), if necessary.

Suggested by Alex to avoid copying non-trivial portions of code which would
then add maintainenace burden.

https://bugzilla.gnome.org/show_bug.cgi?id=740795
This commit is contained in:
Chun-wei Fan 2014-12-17 16:06:25 +08:00
parent 6e7bf9ca7a
commit 9fd9f61b00
3 changed files with 27 additions and 5 deletions
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7
gdk/gdkgl.c
View File

@ -720,11 +720,8 @@ gdk_gl_texture_from_surface (cairo_surface_t *surface,
e.height *= sy;
image = cairo_surface_map_to_image (surface, &e);
glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
glPixelStorei (GL_UNPACK_ROW_LENGTH, cairo_image_surface_get_stride (image)/4);
glTexImage2D (target, 0, 4, e.width, e.height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
cairo_image_surface_get_data (image));
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
/* We might have a different alignment, stride or format, so allow overriding here if needed */
GDK_GL_CONTEXT_GET_CLASS (paint_context)->upload_texture (paint_context, image, e.width, e.height, target);
cairo_surface_unmap_image (surface, image);

20
gdk/gdkglcontext.c
View File

@ -226,6 +226,23 @@ gdk_gl_context_get_property (GObject *gobject,
}
}
/* Default implementation of upload_texture() for gdk_gl_texture_from_surface() */
static void
gdk_gl_context_upload_texture (GdkGLContext *context,
cairo_surface_t *image_surface,
int width,
int height,
guint texture_target)
{
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
glPixelStorei (GL_UNPACK_ROW_LENGTH, cairo_image_surface_get_stride (image_surface)/4);
glTexImage2D (texture_target, 0, 4, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
cairo_image_surface_get_data (image_surface));
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
}
static void
gdk_gl_context_class_init (GdkGLContextClass *klass)
{
@ -301,6 +318,9 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
gobject_class->dispose = gdk_gl_context_dispose;
gobject_class->finalize = gdk_gl_context_finalize;
/* Default Implementation of upload_texture() for gdk_gl_texture_from_surface() */
klass->upload_texture = gdk_gl_context_upload_texture;
g_object_class_install_properties (gobject_class, LAST_PROP, obj_pspecs);
}

5
gdk/gdkglcontextprivate.h
View File

@ -46,6 +46,11 @@ struct _GdkGLContextClass
gboolean (* texture_from_surface) (GdkGLContext *context,
cairo_surface_t *surface,
cairo_region_t *region);
void (* upload_texture) (GdkGLContext *context,
cairo_surface_t *image_surface,
int width,
int height,
guint texture_target);
};
typedef struct {