Hi Weihua,
You can choose the format of the pixel data from the following formats: GL_VIV_YV12, GL_VIV_NV12, GL_VIV_NV21, GL_VIV_YUY2, GL_VIV_UYVY, GL_RGBA , and GL_BGRA_EXT:
Example: If Format is GL_RGBA, glTexDirectVIV creates a pixel array with four GL_UNSIGNED_BYTE components: the first byte for red pixels, the second byte for green pixels, the third byte for blue, and the fourth byte for alpha. ? If Format is GL_BGRA_EXT, glTexDirectVIV creates a pixel array with four GL_UNSIGNED_BYTE components: the first byte for blue pixels, the second byte for green pixels, the third byte for red, and the fourth byte for alpha.
First, call glTexDirectVIVMap to map Logical and Physical address to the texture.
Second, you can modify Logical and Physical data. Then, call glTexDirectInvalidateVIV to apply the texture before you draw something with that texture.
...
char *Logical = (char*) malloc (sizeof(char)*size);
Gluint physical = ~0U;
glTexDirectVIVMap(GL_TEXUTURE_2D, 512, 512, GL_VIV_YV12,
(void**)&Logical, &25hysical);
....
GlTexDirectInvalidateVIV(GL_TEXTURE_2D);
....
glDrawArrays(...);
Hope this helps
