android - OpenGL ES 3.0 half float (R16F) textures -

can answer me how come line:

gles30.glteximage2d(gles30.gl_texture_2d, 0,  gles30.gl_r16f, width, height, 0,  gles30.gl_red, gles30.gl_half_float, mybuffer); 

works on tegra4 doesn't work on arm mali-t628 mp6?

i not attaching framebuffer way, using read texture. code returned on arm 1280 tegra 'doesn't complain' @ all.

also, know tegra4 got extension half float textures, , specific mali doesn't have extension, since it's opengl es 3.0, shouldn't support such textures?

that call looks valid me. error 1280 gl_invalid_enum, suggests 1 of 3 enum type arguments invalid. each 1 itself, combination of them, spec compliant.

the explanation driver bug. found several es 3.0 drivers have numerous issues, it's not big surprise discover problems.

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the section below written under assumption texture used render target (fbo attachment). please ignore if looking direct answer question.

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gl_r16f not color-renderable in standard es 3.0.

if pull spec document, can found on www.khronos.org (direct link), table 3.13 on pages 130-132 lists texture formats , properties. r16f not have checkmark in "color-renderable" column, means can not used render target.

correspondingly, r16f listed under "texture-only color formats" in section "required texture formats" on pages 129-130.

this means device needs ext_color_buffer_half_float extension support rendering r16f. still case in es 3.1 well.