bc8a18ebc3
Setting up layer combine functions and blend modes is very awkward to do programatically. This adds a parser for string based descriptions which are more consise and readable. E.g. a material layer combine function could now be given as: "RGBA = ADD (TEXTURE[A], PREVIOUS[RGB])" or "RGB = REPLACE (PREVIOUS)" "A = MODULATE (PREVIOUS, TEXTURE)" The simple syntax and grammar are only designed to expose standard fixed function hardware, more advanced combining must be done with shaders. This includes standalone documentation of blend strings covering the aspects that are common to blending and texture combining, and adds documentation with examples specific to the new cogl_material_set_blend() and cogl_material_layer_set_combine() functions. Note: The hope is to remove the now redundant bits of the material API before 1.0
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib/gi18n-lib.h>
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#include "cogl-debug.h"
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#ifdef COGL_ENABLE_DEBUG
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static const GDebugKey cogl_debug_keys[] = {
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{ "misc", COGL_DEBUG_MISC },
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{ "texture", COGL_DEBUG_TEXTURE },
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{ "material", COGL_DEBUG_MATERIAL },
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{ "shader", COGL_DEBUG_SHADER },
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{ "offscreen", COGL_DEBUG_OFFSCREEN },
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{ "draw", COGL_DEBUG_DRAW },
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{ "pango", COGL_DEBUG_PANGO },
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{ "rectangles", COGL_DEBUG_RECTANGLES },
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{ "handle", COGL_DEBUG_HANDLE },
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{ "blend-strings", COGL_DEBUG_BLEND_STRINGS }
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};
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static const gint n_cogl_debug_keys = G_N_ELEMENTS (cogl_debug_keys);
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#endif /* COGL_ENABLE_DEBUG */
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guint cogl_debug_flags = 0;
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#ifdef COGL_ENABLE_DEBUG
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static gboolean
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cogl_arg_debug_cb (const char *key,
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const char *value,
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gpointer user_data)
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{
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cogl_debug_flags |=
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g_parse_debug_string (value,
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cogl_debug_keys,
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n_cogl_debug_keys);
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return TRUE;
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}
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static gboolean
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cogl_arg_no_debug_cb (const char *key,
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const char *value,
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gpointer user_data)
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{
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cogl_debug_flags &=
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~g_parse_debug_string (value,
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cogl_debug_keys,
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n_cogl_debug_keys);
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return TRUE;
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}
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#endif /* CLUTTER_ENABLE_DEBUG */
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static GOptionEntry cogl_args[] = {
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#ifdef COGL_ENABLE_DEBUG
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{ "cogl-debug", 0, 0, G_OPTION_ARG_CALLBACK, cogl_arg_debug_cb,
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N_("COGL debugging flags to set"), "FLAGS" },
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{ "cogl-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, cogl_arg_no_debug_cb,
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N_("COGL debugging flags to unset"), "FLAGS" },
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#endif /* COGL_ENABLE_DEBUG */
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{ NULL, },
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};
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static gboolean
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pre_parse_hook (GOptionContext *context,
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GOptionGroup *group,
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gpointer data,
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GError **error)
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{
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const char *env_string;
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#ifdef COGL_ENABLE_DEBUG
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env_string = g_getenv ("COGL_DEBUG");
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if (env_string != NULL)
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{
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cogl_debug_flags =
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g_parse_debug_string (env_string,
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cogl_debug_keys,
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n_cogl_debug_keys);
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env_string = NULL;
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}
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#endif /* COGL_ENABLE_DEBUG */
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return TRUE;
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}
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GOptionGroup *
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cogl_get_option_group (void)
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{
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GOptionGroup *group;
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group = g_option_group_new ("cogl",
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_("COGL Options"),
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_("Show COGL options"),
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NULL, NULL);
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g_option_group_set_parse_hooks (group, pre_parse_hook, NULL);
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g_option_group_add_entries (group, cogl_args);
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g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
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return group;
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}
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