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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: 5.0.1 (2011/05/01)
#include "Wm5GraphicsPCH.h"
#include "Wm5Texture1D.h"
#include "Wm5BitHacks.h"
#include "Wm5Renderer.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, Texture, Texture1D);
WM5_IMPLEMENT_STREAM(Texture1D);
WM5_IMPLEMENT_FACTORY(Texture1D);
WM5_IMPLEMENT_DEFAULT_NAMES(Texture, Texture1D);
WM5_IMPLEMENT_DEFAULT_STREAM(Texture, Texture1D);
//----------------------------------------------------------------------------
Texture1D::Texture1D (Format tformat, int dimension0, int numLevels,
Buffer::Usage usage)
:
Texture(tformat, TT_1D, usage, numLevels)
{
assertion(dimension0 > 0, "Dimension0 must be positive\n");
mDimension[0][0] = dimension0;
unsigned int logDim0 = Log2OfPowerOfTwo((unsigned int)dimension0);
int maxLevels = (int)logDim0 + 1;
if (numLevels == 0)
{
// The user wants the maximum number of levels.
mNumLevels = maxLevels;
}
else if (numLevels <= maxLevels)
{
// The user wants the specified number of levels.
mNumLevels = numLevels;
}
else
{
assertion(false, "Invalid number of levels\n");
}
ComputeNumLevelBytes();
mData = new1<char>(mNumTotalBytes);
}
//----------------------------------------------------------------------------
Texture1D::~Texture1D ()
{
Renderer::UnbindAll(this);
}
//----------------------------------------------------------------------------
void Texture1D::GenerateMipmaps ()
{
// Destroy the texture bindings if it does not have the maximum miplevels.
// The bindings will be recreated later.
unsigned int logDim0 = Log2OfPowerOfTwo((unsigned int)mDimension[0][0]);
int maxLevels = (int)logDim0 + 1;
bool retainBindings = true;
if (mNumLevels != maxLevels)
{
retainBindings = false;
Renderer::UnbindAll(this);
mNumLevels = maxLevels;
ComputeNumLevelBytes();
char* newData = new1<char>(mNumTotalBytes);
memcpy(newData, mData, mNumLevelBytes[0]);
delete1(mData);
mData = newData;
}
// Temporary storage for generating mipmaps.
Float4* rgba = new1<Float4>(mDimension[0][0]);
char* texels = mData;
int length = mDimension[0][0];
int level;
for (level = 1; level < mNumLevels; ++level)
{
char* texelsNext = mData + mLevelOffsets[level];
int lengthNext = mDimension[0][level];
GenerateNextMipmap(length, texels, lengthNext, texelsNext, rgba);
length = lengthNext;
texels = texelsNext;
}
delete1(rgba);
if (retainBindings)
{
for (level = 0; level < mNumLevels; ++level)
{
Renderer::UpdateAll(this, level);
}
}
}
//----------------------------------------------------------------------------
bool Texture1D::HasMipmaps () const
{
unsigned int logDim0 = Log2OfPowerOfTwo((unsigned int)mDimension[0][0]);
int maxLevels = (int)logDim0 + 1;
return mNumLevels == maxLevels;
}
//----------------------------------------------------------------------------
char* Texture1D::GetData (int level) const
{
if (mData && 0 <= level && level < mNumLevels)
{
return mData + mLevelOffsets[level];
}
assertion(false, "Null pointer or invalid level in GetData\n");
return 0;
}
//----------------------------------------------------------------------------
void Texture1D::ComputeNumLevelBytes ()
{
if (mFormat == TF_R32F
|| mFormat == TF_G32R32F
|| mFormat == TF_A32B32G32R32F)
{
if (mNumLevels > 1)
{
assertion(false, "No mipmaps for 32-bit float textures\n");
mNumLevels = 1;
}
}
else if (mFormat == TF_DXT1 || mFormat == TF_DXT3 || mFormat == TF_DXT5)
{
assertion(false, "No DXT compression for 1D textures\n");
mNumLevels = 1;
}
else if (mFormat == TF_D24S8)
{
assertion(false, "Depth textures must be 2D\n");
mNumLevels = 1;
}
int level;
int dim0 = mDimension[0][0];
mNumTotalBytes = 0;
for (level = 0; level < mNumLevels; ++level)
{
mNumLevelBytes[level] = msPixelSize[mFormat]*dim0;
mNumTotalBytes += mNumLevelBytes[level];
mDimension[0][level] = dim0;
mDimension[1][level] = 1;
mDimension[2][level] = 1;
if (dim0 > 1)
{
dim0 >>= 1;
}
}
mLevelOffsets[0] = 0;
for (level = 0; level < mNumLevels-1; ++level)
{
mLevelOffsets[level+1] = mLevelOffsets[level] + mNumLevelBytes[level];
}
}
//----------------------------------------------------------------------------
void Texture1D::GenerateNextMipmap (int length, const char* texels,
int lengthNext, char* texelsNext, Float4* rgba)
{
// Convert the texels from native format to 32-bit RGBA.
msConvertFrom[mFormat](length, texels, rgba);
// Create the next miplevel in-place.
for (int i = 0; i < lengthNext; ++i)
{
int base = 2*i;
for (int c = 0; c < 4; ++c)
{
rgba[i][c] = 0.5f*(rgba[base][c] + rgba[base+1][c]);
}
}
// Convert the texels from 32-bit RGBA to native format.
msConvertTo[mFormat](lengthNext, rgba, texelsNext);
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Support for load of raw data.
//----------------------------------------------------------------------------
Texture1D* Texture1D::LoadWMTF (const std::string& name, int mode)
{
Texture* texture = Texture::LoadWMTF(name, mode);
if (texture && texture->IsExactly(Texture1D::TYPE))
{
return (Texture1D*)texture;
}
delete0(texture);
return 0;
}
//----------------------------------------------------------------------------
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