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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "VertexArray.h"
#include "GLContext.h"
#include "SubVertexArray.h"
#include "../base/Exception.h"
#include "../base/WideLine.h"
#include "../base/ObjectCounter.h"
#include <iostream>
#include <stddef.h>
#include <string.h>
using namespace std;
using namespace boost;
namespace avg {
const unsigned VertexArray::TEX_INDEX = 0;
const unsigned VertexArray::POS_INDEX = 1;
const unsigned VertexArray::COLOR_INDEX = 2;
VertexArray::VertexArray(int reserveVerts, int reserveIndexes)
: VertexData(reserveVerts, reserveIndexes)
{
GLContext* pContext = GLContext::getCurrent();
if (getReserveVerts() != MIN_VERTEXES || getReserveIndexes() != MIN_INDEXES) {
glproc::GenBuffers(1, &m_GLVertexBufferID);
glproc::GenBuffers(1, &m_GLIndexBufferID);
} else {
m_GLVertexBufferID = pContext->getVertexBufferCache().getBuffer();
m_GLIndexBufferID = pContext->getIndexBufferCache().getBuffer();
}
m_bUseMapBuffer = (!pContext->isGLES());
}
VertexArray::~VertexArray()
{
GLContext* pContext = GLContext::getCurrent();
if (pContext) {
if (getReserveVerts() == MIN_VERTEXES) {
pContext->getVertexBufferCache().returnBuffer(m_GLVertexBufferID);
} else {
glproc::DeleteBuffers(1, &m_GLVertexBufferID);
}
if (getReserveIndexes() == MIN_INDEXES) {
pContext->getIndexBufferCache().returnBuffer(m_GLIndexBufferID);
} else {
glproc::DeleteBuffers(1, &m_GLIndexBufferID);
}
}
}
void VertexArray::update()
{
if (hasDataChanged()) {
transferBuffer(GL_ARRAY_BUFFER, m_GLVertexBufferID,
getReserveVerts()*sizeof(Vertex),
getNumVerts()*sizeof(Vertex), getVertexPointer());
#ifdef AVG_ENABLE_EGL
transferBuffer(GL_ELEMENT_ARRAY_BUFFER, m_GLIndexBufferID,
getReserveIndexes()*sizeof(unsigned short),
getNumIndexes()*sizeof(unsigned short), getIndexPointer());
#else
transferBuffer(GL_ELEMENT_ARRAY_BUFFER, m_GLIndexBufferID,
getReserveIndexes()*sizeof(unsigned int),
getNumIndexes()*sizeof(unsigned int), getIndexPointer());
#endif
GLContext::checkError("VertexArray::update()");
}
resetDataChanged();
}
void VertexArray::activate()
{
glproc::BindBuffer(GL_ARRAY_BUFFER, m_GLVertexBufferID);
glproc::BindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_GLIndexBufferID);
glproc::VertexAttribPointer(TEX_INDEX, 2, GL_SHORT, GL_FALSE,
sizeof(Vertex), (void *)(offsetof(Vertex, m_Tex)));
glproc::VertexAttribPointer(POS_INDEX, 2, GL_FLOAT, GL_FALSE,
sizeof(Vertex), (void *)(offsetof(Vertex, m_Pos)));
glproc::VertexAttribPointer(COLOR_INDEX, 4, GL_UNSIGNED_BYTE, GL_TRUE,
sizeof(Vertex), (void *)(offsetof(Vertex, m_Color)));
glproc::EnableVertexAttribArray(TEX_INDEX);
glproc::EnableVertexAttribArray(POS_INDEX);
glproc::EnableVertexAttribArray(COLOR_INDEX);
GLContext::checkError("VertexArray::activate()");
}
void VertexArray::draw()
{
update();
activate();
#ifdef AVG_ENABLE_EGL
glDrawElements(GL_TRIANGLES, getNumIndexes(), GL_UNSIGNED_SHORT, 0);
#else
glDrawElements(GL_TRIANGLES, getNumIndexes(), GL_UNSIGNED_INT, 0);
#endif
GLContext::checkError("VertexArray::draw()");
}
void VertexArray::draw(unsigned startIndex, unsigned numIndexes, unsigned startVertex,
unsigned numVertexes)
{
#ifdef AVG_ENABLE_EGL
glDrawElements(GL_TRIANGLES, numIndexes, GL_UNSIGNED_SHORT,
(void *)(startIndex*sizeof(unsigned short)));
#else
glDrawElements(GL_TRIANGLES, numIndexes, GL_UNSIGNED_INT,
(void *)(startIndex*sizeof(unsigned int)));
#endif
// XXX: Theoretically faster, but broken on Linux/Intel N10 graphics, Ubuntu 12/04
// glproc::DrawRangeElements(GL_TRIANGLES, startVertex, startVertex+numVertexes,
// numIndexes, GL_UNSIGNED_SHORT, (void *)(startIndex*sizeof(unsigned short)));
GLContext::checkError("VertexArray::draw()");
}
void VertexArray::startSubVA(SubVertexArray& subVA)
{
subVA.init(this, getNumVerts(), getNumIndexes());
}
void VertexArray::transferBuffer(GLenum target, unsigned bufferID, unsigned reservedSize,
unsigned usedSize, const void* pData)
{
glproc::BindBuffer(target, bufferID);
if (m_bUseMapBuffer) {
glproc::BufferData(target, reservedSize, 0, GL_STREAM_DRAW);
void * pBuffer = glproc::MapBuffer(target, GL_WRITE_ONLY);
memcpy(pBuffer, pData, usedSize);
glproc::UnmapBuffer(target);
} else {
glproc::BufferData(target, usedSize, pData, GL_STREAM_DRAW);
}
}
}
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