Are the floats 32 bits, since that is what I provide it, or are they the precision of a highp float?
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Are the floats 32 bits, since that is what I provide it, or are they the precision of a highp float?
If you absolutely need to use highp, specify it in the shader.
You can also test for what precisions are available with glGetShaderPrecisionFormat. As for what is being used be default, it varies between different hardware and even different shader stages.