Texture::Texture( const Channel8u &channel, Format format )
: mObj( shared_ptr<Obj>( new Obj( channel.getWidth(), channel.getHeight() ) ) )
{
if( format.mInternalFormat < 0 )
format.mInternalFormat = GL_LUMINANCE;
mObj->mInternalFormat = format.mInternalFormat;
mObj->mTarget = format.mTarget;
// if the data is not already contiguous, we'll need to create a block of memory that is
if( ( channel.getIncrement() != 1 ) || ( channel.getRowBytes() != channel.getWidth() * sizeof(uint8_t) ) ) {
shared_ptr<uint8_t> data( new uint8_t[channel.getWidth() * channel.getHeight()], checked_array_deleter<uint8_t>() );
uint8_t *dest = data.get();
const int8_t inc = channel.getIncrement();
const int32_t width = channel.getWidth();
for( int y = 0; y < channel.getHeight(); ++y ) {
const uint8_t *src = channel.getData( 0, y );
for( int x = 0; x < width; ++x ) {
*dest++ = *src;
src += inc;
}
}
init( data.get(), channel.getRowBytes() / channel.getIncrement(), GL_LUMINANCE, GL_UNSIGNED_BYTE, format );
}
else
init( channel.getData(), channel.getRowBytes() / channel.getIncrement(), GL_LUMINANCE, GL_UNSIGNED_BYTE, format );
}
void Texture::update( const Channel8u &channel, const Area &area )
{
glBindTexture( mObj->mTarget, mObj->mTextureID );
// if the data is not already contiguous, we'll need to create a block of memory that is
if( ( channel.getIncrement() != 1 ) || ( channel.getRowBytes() != channel.getWidth() * sizeof(uint8_t) ) ) {
shared_ptr<uint8_t> data( new uint8_t[area.getWidth() * area.getHeight()] );
uint8_t *dest = data.get();
const int8_t inc = channel.getIncrement();
const int32_t width = area.getWidth();
for( int y = 0; y < area.getHeight(); ++y ) {
const uint8_t *src = channel.getData( area.getX1(), area.getY1() + y );
for( int x = 0; x < width; ++x ) {
*dest++ = *src;
src += inc;
}
}
glTexSubImage2D( mObj->mTarget, 0, area.getX1(), area.getY1(), area.getWidth(), area.getHeight(), GL_LUMINANCE, GL_UNSIGNED_BYTE, data.get() );
}
else
glTexSubImage2D( mObj->mTarget, 0, area.getX1(), area.getY1(), area.getWidth(), area.getHeight(), GL_LUMINANCE, GL_UNSIGNED_BYTE, channel.getData( area.getUL() ) );
}
