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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* gsknglbufferprivate.h
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*
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* Copyright 2020 Christian Hergert <chergert@redhat.com>
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*
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* This file is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 2.1 of the License, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "config.h"
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#include <string.h>
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#include "gsknglbufferprivate.h"
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/**
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* gsk_ngl_buffer_init:
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* @target: the target buffer such as %GL_ARRAY_BUFFER or %GL_UNIFORM_BUFFER
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* @element_size: the size of elements within the buffer
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*
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* Creates a new `GskNglBuffer` which can be used to deliver data to shaders
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* within a GLSL program. You can use this to store vertices such as with
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* %GL_ARRAY_BUFFER or uniform data with %GL_UNIFORM_BUFFER.
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*/
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void
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gsk_ngl_buffer_init (GskNglBuffer *self,
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GLenum target,
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guint element_size)
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{
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memset (self, 0, sizeof *self);
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/* Default to 2 pages, power-of-two growth from there */
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self->buffer_len = 4096 * 2;
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self->buffer = g_malloc (self->buffer_len);
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self->target = target;
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self->element_size = element_size;
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}
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GLuint
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gsk_ngl_buffer_submit (GskNglBuffer *buffer)
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{
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GLuint id;
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glGenBuffers (1, &id);
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glBindBuffer (buffer->target, id);
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glBufferData (buffer->target, buffer->buffer_pos, buffer->buffer, GL_STATIC_DRAW);
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buffer->buffer_pos = 0;
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buffer->count = 0;
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return id;
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}
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void
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gsk_ngl_buffer_destroy (GskNglBuffer *buffer)
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{
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g_clear_pointer (&buffer->buffer, g_free);
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}
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