pcsx2/plugins/GSdx_legacy/GSUniformBufferOGL.h

156 lines
3.9 KiB
C++

/*
* 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)
{
glGenBuffers(1, &buffer);
bind();
allocate();
attach();
}
void bind()
{
if (GLState::ubo != buffer) {
GLState::ubo = buffer;
glBindBuffer(GL_UNIFORM_BUFFER, buffer);
}
}
void allocate()
{
glBufferData(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;
glBindBufferBase(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
glBufferSubData(GL_UNIFORM_BUFFER, 0, size, src);
#ifdef ENABLE_OGL_DEBUG_MEM_BW
g_uniform_upload_byte += size;
#endif
}
~GSUniformBufferOGL() {
glDeleteBuffers(1, &buffer);
}
};
#define UBO_BUFFER_SIZE (4*1024*1024)
class GSUniformBufferStorageOGL {
GLuint buffer; // data object
GLuint index; // GLSL slot
uint32 size; // size of the data
uint8* m_buffer_ptr;
uint32 m_offset;
public:
GSUniformBufferStorageOGL(GLuint index, uint32 size) : index(index)
, size(size), m_offset(0)
{
glGenBuffers(1, &buffer);
bind();
allocate();
attach();
}
void bind()
{
if (GLState::ubo != buffer) {
GLState::ubo = buffer;
glBindBuffer(GL_UNIFORM_BUFFER, buffer);
}
}
void allocate()
{
const GLbitfield common_flags = GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT /*| GL_MAP_COHERENT_BIT */;
const GLbitfield map_flags = common_flags | GL_MAP_FLUSH_EXPLICIT_BIT;
const GLbitfield create_flags = common_flags /*| GL_CLIENT_STORAGE_BIT */;
GLsizei buffer_size = UBO_BUFFER_SIZE;
glBufferStorage(GL_UNIFORM_BUFFER, buffer_size, NULL, create_flags);
m_buffer_ptr = (uint8*) glMapBufferRange(GL_UNIFORM_BUFFER, 0, buffer_size, map_flags);
ASSERT(m_buffer_ptr);
}
void attach()
{
// From the opengl manpage:
// glBindBufferBase also binds buffer to the generic buffer binding point specified by target
GLState::ubo = buffer;
//glBindBufferBase(GL_UNIFORM_BUFFER, index, buffer);
glBindBufferRange(GL_UNIFORM_BUFFER, index, buffer, m_offset, size);
}
void upload(const void* src)
{
#ifdef ENABLE_OGL_DEBUG_MEM_BW
g_uniform_upload_byte += size;
#endif
memcpy(m_buffer_ptr + m_offset, src, size);
attach();
glFlushMappedBufferRange(GL_UNIFORM_BUFFER, m_offset, size);
m_offset = (m_offset + size + 255u) & ~0xFF;
if (m_offset >= UBO_BUFFER_SIZE)
m_offset = 0;
}
~GSUniformBufferStorageOGL() {
bind();
glUnmapBuffer(GL_UNIFORM_BUFFER);
glDeleteBuffers(1, &buffer);
}
};
#undef UBO_BUFFER_SIZE