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A CoglIndexArray is a subclass of CoglBuffer and will be used to hold vertex indices. A later commit will add a CoglIndices API which will allow describing a range of indices inside a CoglIndexArray.
132 lines
4.0 KiB
C
132 lines
4.0 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) 2010 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
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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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-object-private.h"
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#include "cogl-indices.h"
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#include "cogl-indices-private.h"
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static void _cogl_index_array_free (CoglIndexArray *indices);
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COGL_BUFFER_DEFINE (IndexArray, index_array);
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/* XXX: Unlike the wiki design this just takes a size. A single
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* indices buffer should be able to contain multiple ranges of indices
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* which the wiki design doesn't currently consider. */
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CoglIndexArray *
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cogl_index_array_new (gsize bytes)
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{
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CoglIndexArray *indices = g_slice_new (CoglIndexArray);
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gboolean use_malloc;
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if (!cogl_features_available (COGL_FEATURE_VBOS))
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use_malloc = TRUE;
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else
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use_malloc = FALSE;
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/* parent's constructor */
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_cogl_buffer_initialize (COGL_BUFFER (indices),
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bytes,
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use_malloc,
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COGL_BUFFER_BIND_TARGET_INDEX_ARRAY,
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COGL_BUFFER_USAGE_HINT_INDEX_ARRAY,
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COGL_BUFFER_UPDATE_HINT_STATIC);
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return _cogl_index_array_object_new (indices);
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}
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static void
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_cogl_index_array_free (CoglIndexArray *indices)
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{
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/* parent's destructor */
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_cogl_buffer_fini (COGL_BUFFER (indices));
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g_slice_free (CoglIndexArray, indices);
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}
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gboolean
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cogl_index_array_allocate (CoglIndexArray *indices,
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GError *error)
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{
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/* TODO */
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return TRUE;
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}
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/* XXX: do we want a convenience function like this as an alternative
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* to using cogl_buffer_set_data? The advantage of this is that we can
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* track meta data such as the indices type and max_index_value for a
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* range as part of the indices array. If we just leave people to use
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* cogl_buffer_set_data then we either need a way to specify the type
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* and max index value at draw time or we'll want a separate way to
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* declare the type and max value for a range after uploading the
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* data.
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*
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* XXX: I think in the end it'll be that CoglIndices are to
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* CoglIndexArrays as CoglVertexAttributes are to CoglVertices. I.e
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* a CoglIndexArray is a lite subclass of CoglBuffer that simply
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* implies that the buffer will later be bound as indices but doesn't
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* track more detailed meta data. CoglIndices build on a
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* CoglIndexArray and define the type and max_index_value for some
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* sub-range of a CoglIndexArray.
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*
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* XXX: The double plurel form that "Indices" "Array" implies could be
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* a bit confusing. Also to be a bit more consistent with
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* CoglVertexArray vs CoglVertexAttribute it might be best to rename so
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* we have CoglIndexArray vs CoglIndices? maybe even
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* CoglIndexRange :-/ ?
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*
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* CoglBuffer
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* CoglVertexArray (buffer sub-class)
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* CoglPrimitive (defines meta data for sub-region of array)
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* CoglPixelArray (buffer sub-class)
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* CoglIndexArray (buffer sub-class)
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* CoglIndices (defines meta data for sub-region of array)
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*
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*/
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#if 0
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void
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cogl_index_array_set_data (CoglIndexArray *indices,
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CoglIndicesType type,
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int max_index_value,
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gsize write_offset,
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void *user_indices,
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int n_indices)
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{
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GList *l;
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for (l = indices->ranges; l; l = l->next)
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{
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}
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cogl_buffer_set
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}
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#endif
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