#include "OgreHardwarePixelBuffer.h"

// Create the texture
TexturePtr texture = TextureManager::getSingleton().createManual(
    "DynamicTexture", // name
    ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
    TEX_TYPE_2D,      // type
    256, 256,         // width & height
    0,                // number of mipmaps
    PF_BYTE_BGRA,     // pixel format
    TU_DEFAULT);      // usage; should be TU_DYNAMIC_WRITE_ONLY_DISCARDABLE for
                      // textures updated very often (e.g. each frame)

// Get the pixel buffer
HardwarePixelBufferSharedPtr pixelBuffer = texture->getBuffer();

// Lock the pixel buffer and get a pixel box
pixelBuffer->lock(HardwareBuffer::HBL_NORMAL); // for best performance use HBL_DISCARD!
const PixelBox& pixelBox = pixelBuffer->getCurrentLock();

uint8* pDest = static_cast<uint8*>(pixelBox.data);

// Fill in some pixel data. This will give a semi-transparent blue,
// but this is of course dependent on the chosen pixel format.
for (size_t j = 0; j < 256; j++)
{
    for(size_t i = 0; i < 256; i++)
    {
        *pDest++ = 255; // B
        *pDest++ =   0; // G
        *pDest++ =   0; // R
        *pDest++ = 127; // A
    }

    pDest += pixelBox.getRowSkip() * Ogre::PixelUtil::getNumElemBytes(pixelBox.format);
}

// Unlock the pixel buffer
pixelBuffer->unlock();

// Create a material using the texture
MaterialPtr material = MaterialManager::getSingleton().create(
    "DynamicTextureMaterial", // name
    ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);

material->getTechnique(0)->getPass(0)->createTextureUnitState("DynamicTexture");
material->getTechnique(0)->getPass(0)->setSceneBlending(SBT_TRANSPARENT_ALPHA);