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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
/**
* @brief EXT_pixel_buffer_object implementation
* EXT_pixel_buffer_object class implementation
*/
#include <assert.h>
#include <vector>
#include "System/mmgr.h"
#include "PBO.h"
#include "Rendering/GlobalRendering.h"
#include "System/Config/ConfigHandler.h"
CONFIG(bool, UsePBO).defaultValue(true).safemodeValue(false);
/**
* Returns if the current gpu drivers support Pixelbuffer Objects
*/
bool PBO::IsSupported()
{
return (GLEW_EXT_pixel_buffer_object && GLEW_ARB_map_buffer_range && configHandler->GetBool("UsePBO"));
}
PBO::PBO() : pboId(0)
{
bound = false;
mapped = false;
data = NULL;
size = 0;
if (IsSupported()) {
glGenBuffers(1, &pboId);
PBOused = true;
} else {
PBOused = false;
}
}
PBO::~PBO()
{
if (PBOused) {
glDeleteBuffers(1, &pboId);
} else {
delete[] data;
data = NULL;
}
}
void PBO::Bind()
{
assert(!bound);
bound = true;
if (PBOused) {
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pboId);
}
}
void PBO::Unbind(bool discard)
{
assert(bound);
if (PBOused) {
if (discard) {
if (!globalRendering->atiHacks) {
glBufferData(GL_PIXEL_UNPACK_BUFFER, 0, 0, GL_STREAM_DRAW);
} else {
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glDeleteBuffers(1, &pboId);
glGenBuffers(1, &pboId);
}
}
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
} else {
if (discard) {
delete[] data;
data = NULL;
}
}
bound = false;
if (discard) {
size = 0;
}
}
void PBO::Resize(GLsizeiptr _size, GLenum usage)
{
assert(bound);
size = _size;
if (PBOused) {
glBufferData(GL_PIXEL_UNPACK_BUFFER, size, 0, usage);
} else {
delete[] data;
data = NULL; // to prevent a dead-pointer in case of an out-of-memory exception on the next line
data = new GLubyte[size];
}
}
GLubyte* PBO::MapBuffer(GLbitfield access)
{
assert(!mapped);
//! we don't use glMapBuffer, because glMapBufferRange seems to be a small
//! step faster than it due to GL_MAP_UNSYNCHRONIZED_BIT
/*mapped = true;
if (PBOused) {
return (GLubyte*)glMapBuffer(GL_PIXEL_UNPACK_BUFFER, access);
} else {
assert(data);
return data;
}*/
return MapBuffer(0, size, access);
}
GLubyte* PBO::MapBuffer(GLintptr offset, GLsizeiptr _size, GLbitfield access)
{
assert(!mapped);
//! glMapBuffer & glMapBufferRange use different flags for their access argument
//! for easier handling convert the glMapBuffer ones here
switch (access) {
case GL_WRITE_ONLY:
access = GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
break;
case GL_READ_WRITE:
access = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
break;
case GL_READ_ONLY:
access = GL_MAP_READ_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
break;
}
mapped = true;
if (PBOused) {
return (GLubyte*)glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, _size, access);
} else {
assert(data);
return data+offset;
}
}
void PBO::UnmapBuffer()
{
assert(mapped);
if (PBOused) {
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
} else {
}
mapped = false;
}
const GLvoid* PBO::GetPtr(GLintptr offset)
{
assert(bound);
if (PBOused) {
return (GLvoid*)((char*)NULL + (offset));
} else {
assert(data);
return (GLvoid*)(data + offset);
}
}
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