Forums - Corrupted texture data when using PBO

The device I use is Adreno 330.

I'm using a large Pixel Buffer Object(PBO) to upload multiple textures at once. But some mipmap is totally corrupted, looks like they read from other/random memory address.

Sometimes those "black" mipmap show value 0x02020202 in Adreno Profiler.

the pseudo code I use:

create a big buffer(16MB in my case)

glBufferData with "data" = NULL;

ptr = glMapBufferRange;

foreach image:

    foreach mipmap in image

        calculate mipmap data size

        setup correspending buffer offset

        memcpy mipmap data to (ptr + offset)

glFlushMappedBufferRange()

glUnmapBuffer()

 

bind buffer to PIXEL_UNPACK_BUFFER

for each image:

    createTexture;

    bindTexture;

    allocate memory use textureStorage2D;

    foreach mipmap in image:

         glCompressedTexSubImage2D, "data" is set to correspending buffer offset

If I don't use PBO, those textures are correct.

Also, if I use a smaller PBO(for example 2MB), all textures are correct.

I wonder whether it is a bug with the driver, something is wrong when using PBO and large data offset (2MB = 0x200000)

P.S. I check every step with glGetError(), no error happened.

P.S. I test my code on  PoweVR / Mali / Nvidia cards, all seem work correctly.