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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2016 by Mike Erwin. All rights reserved. */
/** \file
* \ingroup gpu
*
* Mimics old style opengl immediate mode drawing.
*/
#pragma once
#include "MEM_guardedalloc.h"
#include "glew-mx.h"
#include "gpu_immediate_private.hh"
namespace blender::gpu {
/* size of internal buffer */
#define DEFAULT_INTERNAL_BUFFER_SIZE (4 * 1024 * 1024)
class GLImmediate : public Immediate {
private:
/* Use two buffers for strict and non-strict vertex count to
* avoid some huge driver slowdown (see T70922).
* Use accessor functions to get / modify. */
struct {
/** Opengl Handle for this buffer. */
GLuint vbo_id = 0;
/** Offset of the mapped data in data. */
size_t buffer_offset = 0;
/** Size of the whole buffer in bytes. */
size_t buffer_size = 0;
} buffer, buffer_strict;
/** Size in bytes of the mapped region. */
size_t bytes_mapped_ = 0;
/** Vertex array for this immediate mode instance. */
GLuint vao_id_ = 0;
public:
GLImmediate();
~GLImmediate();
uchar *begin() override;
void end() override;
private:
GLuint &vbo_id()
{
return strict_vertex_len ? buffer_strict.vbo_id : buffer.vbo_id;
};
size_t &buffer_offset()
{
return strict_vertex_len ? buffer_strict.buffer_offset : buffer.buffer_offset;
};
size_t &buffer_size()
{
return strict_vertex_len ? buffer_strict.buffer_size : buffer.buffer_size;
};
};
} // namespace blender::gpu
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