diff --git a/src/compositor/meta-shadow-factory.c b/src/compositor/meta-shadow-factory.c index ead49fbe9..ade753ca0 100644 --- a/src/compositor/meta-shadow-factory.c +++ b/src/compositor/meta-shadow-factory.c @@ -4,7 +4,8 @@ * * Create and cache shadow textures for abritrary window shapes * - * Copyright (C) 2010 Red Hat, Inc. + * Copyright 2010 Red Hat, Inc. + * Copyright 2010 Intel Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -617,6 +618,49 @@ flip_buffer (guchar *buffer, #undef BLOCK_SIZE } +/* Creates a material with a single layer. Using a common template + * allows sharing a shader between all shadows. To share the same + * shader with all other materials that are just texture plus + * opacity would require cogl fixes. Based on + * gnome-shell/src/st/_st_create_texture_material.c + */ +static CoglHandle +create_texture_material (CoglHandle src_texture) +{ + static CoglHandle texture_material_template = COGL_INVALID_HANDLE; + CoglHandle material; + + g_return_val_if_fail (src_texture != COGL_INVALID_HANDLE, + COGL_INVALID_HANDLE); + + /* We use a material that has a dummy texture as a base for all + texture materials. The idea is that only the Cogl texture object + would be different in the children so it is likely that Cogl will + be able to share GL programs between all the textures. */ + if (G_UNLIKELY (texture_material_template == COGL_INVALID_HANDLE)) + { + static const guint8 white_pixel[] = { 0xff, 0xff, 0xff, 0xff }; + CoglHandle dummy_texture; + + dummy_texture = + cogl_texture_new_from_data (1, 1, + COGL_TEXTURE_NONE, + COGL_PIXEL_FORMAT_RGBA_8888_PRE, + COGL_PIXEL_FORMAT_ANY, + 4, white_pixel); + + texture_material_template = cogl_material_new (); + cogl_material_set_layer (texture_material_template, 0, dummy_texture); + cogl_handle_unref (dummy_texture); + } + + material = cogl_material_copy (texture_material_template); + + cogl_material_set_layer (material, 0, src_texture); + + return material; +} + static void make_shadow (MetaShadow *shadow, cairo_region_t *region) @@ -724,8 +768,7 @@ make_shadow (MetaShadow *shadow, cairo_region_destroy (column_convolve_region); g_free (buffer); - shadow->material = cogl_material_new (); - cogl_material_set_layer (shadow->material, 0, shadow->texture); + shadow->material = create_texture_material (shadow->texture); } static MetaShadowParams *