public override void BlitFromMemory(PixelBox src, BasicBox dstBox)
{
// Fall back to normal GLHardwarePixelBuffer::blitFromMemory in case
// - FBO is not supported
// - Either source or target is luminance due doesn't looks like supported by hardware
// - the source dimensions match the destination ones, in which case no scaling is needed
//Ogre TODO: Check that extension is NOT available
if (PixelUtil.IsLuminance(src.Format) || PixelUtil.IsLuminance(this.format) || (src.Width == dstBox.Width && src.Height == dstBox.Height && src.Depth == dstBox.Depth))
{
base.BlitFromMemory(src, dstBox);
return;
}
if (!Buffer.Contains(dstBox))
{
throw new ArgumentOutOfRangeException("dstBox", "Destination box out of range");
}
//For scoped deletion of conversion buffer
PixelBox srcPB;
BufferBase buf;
//first, convert the srcbox to a OpenGL compatible pixel format
if (GLES2PixelUtil.GetGLOriginFormat(src.Format) == 0)
{
//Conver to buffer intenral format
buf = BufferBase.Wrap(new byte[PixelUtil.GetMemorySize(src.Width, src.Height, src.Depth, this.format)]);
srcPB = new PixelBox(src.Width, src.Height, src.Depth, this.format, buf);
PixelConverter.BulkPixelConversion(src, srcPB);
}
else
{
//No conversion needed
srcPB = src;
}
//Create temporary texture to store source data
int id = 0;
All target = All.Texture2D;
int width = GLES2PixelUtil.OptionalPO2(src.Width);
int height = GLES2PixelUtil.OptionalPO2(src.Height);
All format = GLES2PixelUtil.GetClosestGLInternalFormat(src.Format);
All datatype = GLES2PixelUtil.GetGLOriginDataType(src.Format);
//Generate texture name
GL.GenTextures(1, ref id);
GLES2Config.GlCheckError(this);
//Set texture type
GL.BindTexture(target, id);
GLES2Config.GlCheckError(this);
//Allocate texture memory
GL.TexImage2D(target, 0, (int)format, width, height, 0, format, datatype, IntPtr.Zero);
GLES2Config.GlCheckError(this);
var tex = new GLES2TextureBuffer(string.Empty, target, id, width, height, format, (All)src.Format, 0, 0, BufferUsage.StaticWriteOnly, false, false, 0);
//Upload data to 0,0,0 in temprary texture
var tempTarget = new BasicBox(0, 0, 0, srcPB.Width, srcPB.Height, srcPB.Depth);
tex.Upload(srcPB, tempTarget);
//Blit
this.BlitFromTexture(tex, tempTarget, dstBox);
GLES2Config.GlCheckError(this);
}