/* * GStreamer * Copyright (C) 2012 Matthew Waters * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gl.h" #include "gstglfeature.h" #include "gstglfeature_private.h" #define GST_CAT_DEFAULT gl_feature GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); static void _init_debug (void) { static volatile gsize _init = 0; if (g_once_init_enter (&_init)) { GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glfeature", 0, "OpenGL feature detection"); g_once_init_leave (&_init, 1); } } gboolean gst_gl_check_extension (const char *name, const gchar * ext) { char *end; int name_len, n; if (name == NULL || ext == NULL) return FALSE; end = (char *) (ext + strlen (ext)); name_len = strlen (name); while (ext < end) { n = strcspn (ext, " "); if ((name_len == n) && (!strncmp (name, ext, n))) return TRUE; ext += (n + 1); } return FALSE; } /* Define a set of arrays containing the functions required from GL for each feature */ #define GST_GL_EXT_BEGIN(name, \ gl_availability, \ min_gl_major, min_gl_minor, \ min_gles_major, min_gles_minor, \ namespaces, extension_names) \ static const GstGLFeatureFunction gst_gl_ext_ ## name ## _funcs[] = { #define GST_GL_EXT_FUNCTION(ret, name, args) \ { G_STRINGIFY (name), G_STRUCT_OFFSET (GstGLFuncs, name) }, #define GST_GL_EXT_END() \ { NULL, 0 }, \ }; #include "glprototypes/all_functions.h" #undef GST_GL_EXT_BEGIN #undef GST_GL_EXT_FUNCTION #undef GST_GL_EXT_END #define GST_GL_EXT_BEGIN(name, \ gl_availability, \ min_gl_major, min_gl_minor, \ min_gles_major, min_gles_minor, \ namespaces, extension_names) \ { G_STRINGIFY (name), gl_availability, min_gl_major, min_gl_minor, min_gles_major, \ min_gles_minor, namespaces, extension_names, \ gst_gl_ext_ ## name ## _funcs }, #define GST_GL_EXT_FUNCTION(ret, name, args) #define GST_GL_EXT_END() static const GstGLFeatureData gst_gl_feature_ext_functions_data[] = { #include "glprototypes/all_functions.h" }; #undef GST_GL_EXT_BEGIN #undef GST_GL_EXT_FUNCTION #undef GST_GL_EXT_END static gboolean _gst_gl_feature_check_for_extension (const GstGLFeatureData * data, const char *driver_prefix, const char *extensions_string, const char **suffix) { const char *namespace, *namespace_suffix; unsigned int namespace_len; g_return_val_if_fail (suffix != NULL, FALSE); for (namespace = data->namespaces; *namespace; namespace += strlen (namespace) + 1) { const char *extension; GString *full_extension_name = g_string_new (""); /* If the namespace part contains a ':' then the suffix for the function names is different from the name space */ if ((namespace_suffix = strchr (namespace, ':'))) { namespace_len = namespace_suffix - namespace; namespace_suffix++; } else { namespace_len = strlen (namespace); namespace_suffix = namespace; } for (extension = data->extension_names; *extension; extension += strlen (extension) + 1) { g_string_assign (full_extension_name, driver_prefix); g_string_append_c (full_extension_name, '_'); g_string_append_len (full_extension_name, namespace, namespace_len); g_string_append_c (full_extension_name, '_'); g_string_append (full_extension_name, extension); if (gst_gl_check_extension (full_extension_name->str, extensions_string)) { GST_TRACE ("found %s in extension string", full_extension_name->str); break; } } g_string_free (full_extension_name, TRUE); /* If we found an extension with this namespace then use it as the suffix */ if (*extension) { *suffix = namespace_suffix; return TRUE; } } return FALSE; } gboolean _gst_gl_feature_check (GstGLContext * context, const char *driver_prefix, const GstGLFeatureData * data, int gl_major, int gl_minor, const char *extensions_string) { char *full_function_name = NULL; gboolean in_core = FALSE; const char *suffix = NULL; int func_num; GstGLFuncs *gst_gl = context->gl_vtable; guint gl_min = 0, gl_maj = 0; GstGLAPI gl_api = gst_gl_context_get_gl_api (context); if (gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3)) { gl_maj = data->min_gl_major; gl_min = data->min_gl_minor; } else if (gl_api & (GST_GL_API_GLES1 | GST_GL_API_GLES2)) { gl_maj = data->min_gles_major; gl_min = data->min_gles_minor; } GST_DEBUG ("%s, 0x%x, %d.%d vs 0x%x, %d.%d", data->feature_name, data->gl_availability, gl_maj, gl_min, gst_gl_context_get_gl_api (context), gl_major, gl_minor); /* First check whether the functions should be directly provided by GL */ if (gst_gl_context_check_gl_version (context, data->gl_availability, gl_maj, gl_min)) { in_core = TRUE; suffix = ""; } else { /* Otherwise try all of the extensions */ if (!_gst_gl_feature_check_for_extension (data, driver_prefix, extensions_string, &suffix)) goto error; } /* If we couldn't find anything that provides the functions then give up */ if (suffix == NULL) goto error; /* Try to get all of the entry points */ for (func_num = 0; data->functions[func_num].name; func_num++) { void *func; g_free (full_function_name); full_function_name = g_strconcat ("gl", data->functions[func_num].name, suffix, NULL); GST_TRACE ("%s should %sbe in core", full_function_name, in_core ? "" : "not "); func = gst_gl_context_get_proc_address (context, full_function_name); if (func == NULL && in_core) { GST_TRACE ("%s was not found in core, trying the extension version", full_function_name); if (!_gst_gl_feature_check_for_extension (data, driver_prefix, extensions_string, &suffix)) { goto error; } else { g_free (full_function_name); full_function_name = g_strconcat ("gl", data->functions[func_num].name, suffix, NULL); func = gst_gl_context_get_proc_address (context, full_function_name); } } if (func == NULL) { goto error; } /* Set the function pointer in the context */ *(void **) ((guint8 *) gst_gl + data->functions[func_num].pointer_offset) = func; } g_free (full_function_name); return TRUE; /* If the extension isn't found or one of the functions wasn't found * then set all of the functions pointers to NULL so we can safely * do feature testing by just looking at the function pointers */ error: GST_DEBUG ("failed to find feature %s", data->feature_name); for (func_num = 0; data->functions[func_num].name; func_num++) { *(void **) ((guint8 *) gst_gl + data->functions[func_num].pointer_offset) = NULL; } if (full_function_name) { GST_DEBUG ("failed to find function %s", full_function_name); g_free (full_function_name); } return FALSE; } void _gst_gl_feature_check_ext_functions (GstGLContext * context, int gl_major, int gl_minor, const char *gl_extensions) { int i; _init_debug (); for (i = 0; i < G_N_ELEMENTS (gst_gl_feature_ext_functions_data); i++) { _gst_gl_feature_check (context, "GL", gst_gl_feature_ext_functions_data + i, gl_major, gl_minor, gl_extensions); } }