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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2020 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup gpu
*/
#include "gl_context.hh"
#include "gl_debug.hh"
#include "gl_index_buffer.hh"
namespace blender::gpu {
GLIndexBuf::~GLIndexBuf()
{
GLContext::buf_free(ibo_id_);
}
void GLIndexBuf::bind()
{
if (is_subrange_) {
static_cast<GLIndexBuf *>(src_)->bind();
return;
}
const bool allocate_on_device = ibo_id_ == 0;
if (allocate_on_device) {
glGenBuffers(1, &ibo_id_);
}
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo_id_);
if (data_ != nullptr || allocate_on_device) {
size_t size = this->size_get();
/* Sends data to GPU. */
glBufferData(GL_ELEMENT_ARRAY_BUFFER, size, data_, GL_STATIC_DRAW);
/* No need to keep copy of data in system memory. */
MEM_SAFE_FREE(data_);
}
}
void GLIndexBuf::bind_as_ssbo(uint binding)
{
bind();
BLI_assert(ibo_id_ != 0);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, binding, ibo_id_);
}
const uint32_t *GLIndexBuf::read() const
{
BLI_assert(is_active());
void *data = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_ONLY);
uint32_t *result = static_cast<uint32_t *>(data);
return result;
}
bool GLIndexBuf::is_active() const
{
if (!ibo_id_) {
return false;
}
int active_ibo_id = 0;
glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &active_ibo_id);
return ibo_id_ == active_ibo_id;
}
} // namespace blender::gpu
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