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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.2 (2013/07/13)
#include "Wm5GraphicsPCH.h"
#include "Wm5OpenGLTexture1D.h"
#include "Wm5OpenGLMapping.h"
using namespace Wm5;
//----------------------------------------------------------------------------
PdrTexture1D::PdrTexture1D (Renderer*, const Texture1D* texture)
:
mPreviousTexture(0)
{
mInternalFormat = gOGLTextureInternalFormat[texture->GetFormat()];
mFormat = gOGLTextureFormat[texture->GetFormat()];
mType = gOGLTextureType[texture->GetFormat()];
GLuint usage = gOGLBufferUsage[texture->GetUsage()];
// Create pixel buffer objects to store the texture data.
mNumLevels = texture->GetNumLevels();
int level;
for (level = 0; level < mNumLevels; ++level)
{
mNumLevelBytes[level] = texture->GetNumLevelBytes(level);
glGenBuffers(1, &mBuffer[level]);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, mBuffer[level]);
glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, mNumLevelBytes[level], 0,
usage);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
mDimension[level] = texture->GetDimension(0, level);
mLockedMemory[level] = 0;
mWriteLock[level] = false;
}
for (/**/; level < Texture::MM_MAX_MIPMAP_LEVELS; ++level)
{
mBuffer[level] = 0;
mNumLevelBytes[level] = 0;
mDimension[level] = 0;
mLockedMemory[level] = 0;
mWriteLock[level] = false;
}
// Create a texture structure.
glGenTextures(1, &mTexture);
GLuint previousBind = BindTexture(Shader::ST_1D, mTexture);
// Create the mipmap level structures. No image initialization occurs.
for (level = 0; level < mNumLevels; ++level)
{
glTexImage1D(GL_TEXTURE_1D, level, mInternalFormat, mDimension[level],
0, mFormat, mType, 0);
}
glBindTexture(GL_TEXTURE_1D, previousBind);
for (level = 0; level < mNumLevels; ++level)
{
void* data = Lock(level, Buffer::BL_WRITE_ONLY);
memcpy(data, texture->GetData(level),
texture->GetNumLevelBytes(level));
Unlock(level);
}
}
//----------------------------------------------------------------------------
PdrTexture1D::~PdrTexture1D ()
{
for (int level = 0; level < mNumLevels; ++level)
{
glDeleteBuffers(1, &mBuffer[level]);
}
glDeleteTextures(1, &mTexture);
}
//----------------------------------------------------------------------------
void PdrTexture1D::Enable (Renderer*, int textureUnit)
{
glActiveTexture(GL_TEXTURE0 + textureUnit);
mPreviousTexture = BindTexture(Shader::ST_1D, mTexture);
}
//----------------------------------------------------------------------------
void PdrTexture1D::Disable (Renderer*, int textureUnit)
{
glActiveTexture(GL_TEXTURE0 + textureUnit);
glBindTexture(GL_TEXTURE_1D, mPreviousTexture);
}
//----------------------------------------------------------------------------
void* PdrTexture1D::Lock (int level, Buffer::Locking mode)
{
if (!mLockedMemory[level])
{
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, mBuffer[level]);
mLockedMemory[level] = glMapBuffer(GL_PIXEL_UNPACK_BUFFER_ARB,
gOGLBufferLocking[mode]);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
mWriteLock[level] = (mode != Buffer::BL_READ_ONLY);
}
return mLockedMemory[level];
}
//----------------------------------------------------------------------------
void PdrTexture1D::Unlock (int level)
{
if (mLockedMemory[level])
{
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, mBuffer[level]);
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER_ARB);
if (mWriteLock[level])
{
GLuint previousBind = BindTexture(Shader::ST_1D, mTexture);
// TODO: When creating a texture with only level 0 (not a
// complete set of mipmaps), the following code generates a
// GL_INVALID_OPERATION on an AMD Radeon HD 7970 (Catalyst
// 13.4 and Catalyst 13.6 beta). My analysis shows that it
// should not. So for now, just use glTexImage1D. This
// problem does not occur on my NVIDIA graphics cards.
//
//glTexSubImage1D(GL_TEXTURE_1D, level, 0, mDimension[level],
// mFormat, mType, 0);
glTexImage1D(GL_TEXTURE_1D, level, mInternalFormat,
mDimension[level], 0, mFormat, mType, 0);
glBindTexture(GL_TEXTURE_1D, previousBind);
mWriteLock[level] = false;
}
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
mLockedMemory[level] = 0;
}
}
//----------------------------------------------------------------------------
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