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https://github.com/brl/mutter.git
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067a520f26
This adds three new API calls: CoglHandle cogl_path_get() void cogl_path_set(CoglHandle path) CoglHandle cogl_path_copy(CoglHandle path) All of the fields relating to the path have been moved from the Cogl context to a new CoglPath handle type. The cogl context now just contains a CoglPath handle. All of the existing path commands manipulate the data in the current path handle. cogl_path_new now just creates a new path handle and unrefs the old one. The path handle can be stored for later with cogl_path_get. The path can then be copied with cogl_path_copy. Internally it implements copy-on-write semantics with an extra optimisation that it will only copy the data if the new path is modified, but not if the original path is modified. It can do this because the only way to modify a path is by appending to it so the copied path is able to store its own path length and only render the nodes up to that length. For this to work the copied path also needs to keep its own copies of the path extents because the parent path may change these by adding nodes. The clip stack now uses the cogl_path_copy mechanism to store paths in the stack instead of directly copying the data. This should save some memory and processing time.
244 lines
7.3 KiB
C
244 lines
7.3 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) 2007,2008,2009 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, see <http://www.gnu.org/licenses/>.
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*
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*
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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 "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-util.h"
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#include "cogl-context.h"
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#include "cogl-journal-private.h"
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#include "cogl-texture-private.h"
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#include "cogl-material-private.h"
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#include "cogl-framebuffer-private.h"
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#include "cogl-path-private.h"
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#include <string.h>
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extern void
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_cogl_create_context_driver (CoglContext *context);
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static CoglContext *_context = NULL;
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static gboolean gl_is_indirect = FALSE;
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static gboolean
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cogl_create_context (void)
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{
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GLubyte default_texture_data[] = { 0xff, 0xff, 0xff, 0x0 };
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unsigned long enable_flags = 0;
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CoglHandle window_buffer;
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if (_context != NULL)
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return FALSE;
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/* Allocate context memory */
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_context = (CoglContext*) g_malloc (sizeof (CoglContext));
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/* Init default values */
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_context->feature_flags = 0;
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_context->features_cached = FALSE;
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/* Initialise the driver specific state */
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/* TODO: combine these two into one function */
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_cogl_create_context_driver (_context);
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_cogl_features_init ();
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_cogl_material_init_default_material ();
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_context->enable_flags = 0;
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_context->color_alpha = 0;
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_context->enable_backface_culling = FALSE;
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_context->flushed_front_winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE;
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_context->indirect = gl_is_indirect;
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cogl_matrix_init_identity (&_context->identity_matrix);
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cogl_matrix_init_identity (&_context->y_flip_matrix);
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cogl_matrix_scale (&_context->y_flip_matrix, 1, -1, 1);
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_context->flushed_matrix_mode = COGL_MATRIX_MODELVIEW;
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_context->texture_units = NULL;
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_context->simple_material = cogl_material_new ();
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_context->source_material = NULL;
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_context->default_gl_texture_2d_tex = COGL_INVALID_HANDLE;
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_context->default_gl_texture_rect_tex = COGL_INVALID_HANDLE;
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_context->journal = g_array_new (FALSE, FALSE, sizeof (CoglJournalEntry));
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_context->logged_vertices = g_array_new (FALSE, FALSE, sizeof (GLfloat));
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_context->current_material = NULL;
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_context->current_material_flags = 0;
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memset (&_context->current_material_flush_options,
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0, sizeof (CoglMaterialFlushOptions));
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_context->current_layers = g_array_new (FALSE, FALSE,
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sizeof (CoglLayerInfo));
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_context->n_texcoord_arrays_enabled = 0;
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_context->framebuffer_stack = _cogl_create_framebuffer_stack ();
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window_buffer = _cogl_onscreen_new ();
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cogl_set_framebuffer (window_buffer);
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/* XXX: the deprecated _cogl_set_draw_buffer API expects to
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* find the window buffer here... */
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_context->window_buffer = window_buffer;
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_context->dirty_bound_framebuffer = TRUE;
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_context->dirty_gl_viewport = TRUE;
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_context->current_path = _cogl_path_new ();
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_context->stencil_material = cogl_material_new ();
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_context->in_begin_gl_block = FALSE;
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_context->quad_indices_byte = COGL_INVALID_HANDLE;
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_context->quad_indices_short = COGL_INVALID_HANDLE;
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_context->quad_indices_short_len = 0;
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_context->texture_download_material = COGL_INVALID_HANDLE;
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/* Create default textures used for fall backs */
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_context->default_gl_texture_2d_tex =
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cogl_texture_new_from_data (1, /* width */
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1, /* height */
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
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/* internal format */
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COGL_PIXEL_FORMAT_RGBA_8888_PRE,
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0, /* auto calc row stride */
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default_texture_data);
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_context->default_gl_texture_rect_tex =
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cogl_texture_new_from_data (1, /* width */
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1, /* height */
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
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/* internal format */
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COGL_PIXEL_FORMAT_RGBA_8888_PRE,
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0, /* auto calc row stride */
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default_texture_data);
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cogl_set_source (_context->simple_material);
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_cogl_material_flush_gl_state (_context->source_material, NULL);
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enable_flags =
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_cogl_material_get_cogl_enable_flags (_context->source_material);
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_cogl_enable (enable_flags);
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_cogl_flush_face_winding ();
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_context->atlas = NULL;
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_context->atlas_texture = COGL_INVALID_HANDLE;
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_context->current_pbo = NULL;
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_context->max_texture_units = -1;
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return TRUE;
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}
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void
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_cogl_destroy_context ()
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{
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if (_context == NULL)
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return;
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_cogl_destroy_texture_units ();
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_cogl_free_framebuffer_stack (_context->framebuffer_stack);
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if (_context->current_path)
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cogl_handle_unref (_context->current_path);
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if (_context->default_gl_texture_2d_tex)
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cogl_handle_unref (_context->default_gl_texture_2d_tex);
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if (_context->default_gl_texture_rect_tex)
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cogl_handle_unref (_context->default_gl_texture_rect_tex);
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if (_context->simple_material)
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cogl_handle_unref (_context->simple_material);
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if (_context->journal)
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g_array_free (_context->journal, TRUE);
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if (_context->logged_vertices)
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g_array_free (_context->logged_vertices, TRUE);
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if (_context->current_layers)
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g_array_free (_context->current_layers, TRUE);
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if (_context->quad_indices_byte)
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cogl_handle_unref (_context->quad_indices_byte);
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if (_context->quad_indices_short)
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cogl_handle_unref (_context->quad_indices_short);
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if (_context->default_material)
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cogl_handle_unref (_context->default_material);
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if (_context->atlas)
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_cogl_atlas_free (_context->atlas);
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if (_context->atlas_texture)
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cogl_handle_unref (_context->atlas_texture);
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g_free (_context);
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}
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CoglContext *
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_cogl_context_get_default ()
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{
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/* Create if doesn't exist yet */
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if (_context == NULL)
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cogl_create_context ();
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return _context;
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}
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/**
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* _cogl_set_indirect_context:
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* @indirect: TRUE if GL context is indirect
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*
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* Advises COGL that the GL context is indirect (commands are sent
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* over a socket). COGL uses this information to try to avoid
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* round-trips in its use of GL, for example.
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*
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* This function cannot be called "on the fly," only before COGL
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* initializes.
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*/
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void
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_cogl_set_indirect_context (gboolean indirect)
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{
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/* we get called multiple times if someone creates
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* more than the default stage
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*/
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if (_context != NULL)
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{
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if (indirect != _context->indirect)
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g_warning ("Right now all stages will be treated as "
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"either direct or indirect, ignoring attempt "
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"to change to indirect=%d", indirect);
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return;
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}
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gl_is_indirect = indirect;
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}
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