void Texture::read(size_t size, void* data) const
{
GLenum tex_type = toTextureType(type());
SurfaceFormat fmt = this->format();
ImageFormat gl_fmt = toImageFormat(fmt);
// Read to 'data', not to a device buffer
//glBindBuffer(GL_PIXEL_PACK_BUFFER, GL_NONE);
# if defined(VCL_GL_ARB_direct_state_access)
glGetTextureImage(_glId, 0, gl_fmt.Format, gl_fmt.Type, (GLsizei)size, data);
# else
TextureBindPoint bp(tex_type, _glId);
if (tex_type != GL_TEXTURE_CUBE_MAP)
{
# if defined(VCL_GL_EXT_direct_state_access)
glGetTextureImageEXT(_glId, tex_type, 0, gl_fmt.Format, gl_fmt.Type, data);
# else
glGetTexImage(tex_type, 0, gl_fmt.Format, gl_fmt.Type, data);
# endif
}
else
{
const GLenum faces[] =
{
GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
};
int pixel_size = Vcl::Graphics::sizeInBytes(fmt);
GLsizei w = (GLsizei)width();
GLsizei h = (GLsizei)height();
unsigned char* data_ptr = reinterpret_cast<unsigned char*>(data);
for (const auto face : faces)
{
# if defined(VCL_GL_EXT_direct_state_access)
glGetTextureImageEXT(_glId, face, 0, gl_fmt.Format, gl_fmt.Type, data_ptr);
# else
glGetTexImage(face, 0, gl_fmt.Format, gl_fmt.Type, data_ptr);
# endif
data_ptr += w * h * pixel_size;
}
}
# endif
}
bool GLTextureCubeMap::get( Array2DView< Vector4f > output )
{
// TODO: glPixelStorei allows some packing?
if( output.isNull() ||
output.width() != width() ||
output.height() != height() ||
!( output.packed() ) )
{
return false;
}
// TODO: level
glGetTextureImageEXT( id(), GL_TEXTURE_2D, 0,
GL_RGBA, GL_FLOAT, output );
return true;
}
bool GPU::Texture2D::DumpTo( void *buffer,
const GLenum format,
const GLenum type,
const GLint level ) const
{
if( m_Id )
{
#if glGetTextureImageEXT // Extension GL_EXT_direct_state_access is no supported by every common computer...
glGetTextureImageEXT( m_Id, GL_TEXTURE_2D, level, format, type, buffer );
#else
GPU::FrameBuffer fbuffer( m_Width, m_Height );
fbuffer.Attach( GL_COLOR_ATTACHMENT0_EXT, this );
fbuffer.DumpTo( GL_COLOR_ATTACHMENT0_EXT, buffer, format, type );
#endif
}
return m_Id != 0;
}
bool GLTextureCubeMap::get( Array2DView< Vector2f > output )
{
// TODO: glPixelStorei allows some packing:
// GL_PACK_ALIGNMENT
if( output.isNull() ||
output.width() != width() ||
output.height() != height() ||
!( output.packed() ) )
{
return false;
}
// TODO: GL_RG_INTEGER
// output can be normalized or not
// GL_RG_INTEGER for not normalized
// TODO: level
glGetTextureImageEXT( id(), GL_TEXTURE_2D, 0,
GL_RG, GL_FLOAT, output );
return true;
}
bool GLTextureCubeMap::get( Array2DView< uint8x4 > output, GLImageFormat format )
{
// TODO: glPixelStorei allows some packing?
// GL_PACK_ALIGNMENT
if( output.isNull() ||
output.width() != width() ||
output.height() != height() ||
!( output.packed() ) )
{
return false;
}
if( format != GLImageFormat::RGBA &&
format != GLImageFormat::BGRA )
{
return false;
}
// TODO: mipmap level
glGetTextureImageEXT( id(), GL_TEXTURE_2D, 0,
static_cast< GLenum >( format ), GL_UNSIGNED_BYTE, output );
return true;
}
void CubeMapTexture::getImageImplementationDSAEXT(const Coordinate coordinate, const GLint level, const Vector2i&, const ColorFormat format, const ColorType type, std::size_t, GLvoid* const data) {
_created = true;
glGetTextureImageEXT(_id, GLenum(coordinate), level, GLenum(format), GLenum(type), data);
}
