pcsx2/plugins/GSdx/GSUniformBufferOGL.h

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/*
* Copyright (C) 2011-2011 Gregory hainaut
* Copyright (C) 2007-2009 Gabest
*
* 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, 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
#pragma once
#include "GLState.h"
#ifdef ENABLE_OGL_DEBUG_MEM_BW
extern uint64 g_uniform_upload_byte;
#endif
class GSUniformBufferOGL {
GLuint buffer; // data object
GLuint index; // GLSL slot
uint32 size; // size of the data
public:
GSUniformBufferOGL(GLuint index, uint32 size) : index(index)
, size(size)
{
gl_GenBuffers(1, &buffer);
bind();
allocate();
attach();
}
void bind()
{
if (GLState::ubo != buffer) {
GLState::ubo = buffer;
gl_BindBuffer(GL_UNIFORM_BUFFER, buffer);
}
}
void allocate()
{
gl_BufferData(GL_UNIFORM_BUFFER, size, NULL, GL_DYNAMIC_DRAW);
}
void attach()
{
// From the opengl manpage:
// glBindBufferBase also binds buffer to the generic buffer binding point specified by target
GLState::ubo = buffer;
gl_BindBufferBase(GL_UNIFORM_BUFFER, index, buffer);
}
void upload(const void* src)
{
bind();
// glMapBufferRange allow to set various parameter but the call is
// synchronous whereas glBufferSubData could be asynchronous.
// TODO: investigate the extension ARB_invalidate_subdata
gl_BufferSubData(GL_UNIFORM_BUFFER, 0, size, src);
#ifdef ENABLE_OGL_DEBUG_MEM_BW
g_uniform_upload_byte += size;
#endif
}
~GSUniformBufferOGL() {
gl_DeleteBuffers(1, &buffer);
}
};