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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
*
* Implementation of Multi Draw Indirect using OpenGL.
* Fallback if the needed extensions are not supported.
*/
#pragma once
#include "MEM_guardedalloc.h"
#include "BLI_sys_types.h"
#include "GPU_batch.h"
#include "gpu_drawlist_private.hh"
#include "gl_context.hh"
namespace blender {
namespace gpu {
/**
* Implementation of Multi Draw Indirect using OpenGL.
*/
class GLDrawList : public DrawList {
public:
GLDrawList(int length);
~GLDrawList();
void append(GPUBatch *batch, int i_first, int i_count) override;
void submit() override;
private:
void init();
/** Batch for which we are recording commands for. */
GLBatch *batch_;
/** Mapped memory bounds. */
GLbyte *data_;
/** Length of the mapped buffer (in byte). */
GLsizeiptr data_size_;
/** Current offset inside the mapped buffer (in byte). */
GLintptr command_offset_;
/** Current number of command recorded inside the mapped buffer. */
uint command_len_;
/** Is UINT_MAX if not drawing indexed geom. Also Avoid dereferencing batch. */
GLuint base_index_;
/** Also Avoid dereferencing batch. */
GLuint v_first_, v_count_;
/** GL Indirect Buffer id. 0 means MultiDrawIndirect is not supported/enabled. */
GLuint buffer_id_;
/** Length of whole the buffer (in byte). */
GLsizeiptr buffer_size_;
/** Offset of `data_` inside the whole buffer (in byte). */
GLintptr data_offset_;
/** To free the buffer_id_. */
GLContext *context_;
MEM_CXX_CLASS_ALLOC_FUNCS("GLDrawList");
};
} // namespace gpu
} // namespace blender
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