tests/fbo: init texture content
The "variant 1" subtest uses glBlendFunc(GL_DST_ALPHA, ...) so we must initialize the dst texture or we might get inconsistent results.
This fixes random failures on radeonsi hardware.
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The "variant 1" subtest uses glBlendFunc(GL_DST_ALPHA, ...) so we must initialize the dst texture or we might get inconsistent results.
This fixes random failures on radeonsi hardware.