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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 "Wm5OpenGLTexture2D.h"
#include "Wm5OpenGLMapping.h"
using namespace Wm5;
//----------------------------------------------------------------------------
PdrTexture2D::PdrTexture2D (Renderer*, const Texture2D* 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[0][level] = texture->GetDimension(0, level);
mDimension[1][level] = texture->GetDimension(1, level);
mLockedMemory[level] = 0;
mWriteLock[level] = false;
}
for (/**/; level < Texture::MM_MAX_MIPMAP_LEVELS; ++level)
{
mBuffer[level] = 0;
mNumLevelBytes[level] = 0;
mDimension[0][level] = 0;
mDimension[1][level] = 0;
mLockedMemory[level] = 0;
mWriteLock[level] = false;
}
// Create a texture structure.
glGenTextures(1, &mTexture);
GLuint previousBind = BindTexture(Shader::ST_2D, mTexture);
// Create the mipmap level structures. No image initialization occurs.
mIsCompressed = texture->IsCompressed();
if (mIsCompressed)
{
for (level = 0; level < mNumLevels; ++level)
{
glCompressedTexImage2D(GL_TEXTURE_2D, level, mInternalFormat,
mDimension[0][level], mDimension[1][level], 0,
mNumLevelBytes[level], 0);
}
}
else
{
for (level = 0; level < mNumLevels; ++level)
{
glTexImage2D(GL_TEXTURE_2D, level, mInternalFormat,
mDimension[0][level], mDimension[1][level], 0, mFormat,
mType, 0);
}
}
glBindTexture(GL_TEXTURE_2D, 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);
}
}
//----------------------------------------------------------------------------
PdrTexture2D::~PdrTexture2D ()
{
for (int level = 0; level < mNumLevels; ++level)
{
glDeleteBuffers(1, &mBuffer[level]);
}
glDeleteTextures(1, &mTexture);
}
//----------------------------------------------------------------------------
void PdrTexture2D::Enable (Renderer*,int textureUnit)
{
glActiveTexture(GL_TEXTURE0 + textureUnit);
mPreviousTexture = BindTexture(Shader::ST_2D, mTexture);
}
//----------------------------------------------------------------------------
void PdrTexture2D::Disable (Renderer*,int textureUnit)
{
glActiveTexture(GL_TEXTURE0 + textureUnit);
glBindTexture(GL_TEXTURE_2D, mPreviousTexture);
}
//----------------------------------------------------------------------------
void* PdrTexture2D::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 PdrTexture2D::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_2D, mTexture);
if (mIsCompressed)
{
glCompressedTexSubImage2D(GL_TEXTURE_2D, level, 0, 0,
mDimension[0][level], mDimension[1][level],
mInternalFormat, mNumLevelBytes[level], 0);
}
else
{
// 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 glTexImage2D. This
// problem does not occur on my NVIDIA graphics cards.
//
//glTexSubImage2D(GL_TEXTURE_2D, level, 0, 0,
// mDimension[0][level], mDimension[1][level], mFormat,
// mType, 0);
glTexImage2D(GL_TEXTURE_2D, level, mInternalFormat,
mDimension[0][level], mDimension[1][level], 0, mFormat,
mType, 0);
}
glBindTexture(GL_TEXTURE_2D, previousBind);
mWriteLock[level] = false;
}
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
mLockedMemory[level] = 0;
}
}
//----------------------------------------------------------------------------
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