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Issue on webgl on a chromium port with Mali 400 GPU.

Genevet

Hi,

I am working on a linux (directfb/fbdev) port of chromium on a set top box platform which has a  Mali-400 GPU.

I have an issue with an HTML application creating a webgl context in RGB (without alpha).

After analysis, we can see that chromium creates a frame buffer object, and tries to attach a texture via glFramebufferTexture2D. When checking the status via glCheckFramebufferStatus, we get the error GL_FRAMEBUFFER_UNSUPPORTED. This issue happens only if the color buffer is in format GL_RGB. There is no issue if the format is GL_RGBA.

it seems that the Mali-400 opengl implementation does not support RGB texture as a frame buffer attachment. Is it the case?

Thanks&Regards,

Lidwine

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  • 0 Arm Employee Badge in reply to Genevet

    Is this behavior present on all types of Mali GPU/drivers versions?

    All of the Mali-2/3/400 family. The newer Mali-T600/700/800 families support it (however, note that 24-bit surfaces are generally significantly less efficient than 32-bit surfaces, as they are a power of two, therefore do not align neatly on power of two address boundaries)

    Are there any plan for an update to support RGB?

    No.

    HTH,

    Pete

Reply
  • 0 Arm Employee Badge in reply to Genevet

    Is this behavior present on all types of Mali GPU/drivers versions?

    All of the Mali-2/3/400 family. The newer Mali-T600/700/800 families support it (however, note that 24-bit surfaces are generally significantly less efficient than 32-bit surfaces, as they are a power of two, therefore do not align neatly on power of two address boundaries)

    Are there any plan for an update to support RGB?

    No.

    HTH,

    Pete

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