On 03/30/2011 05:41 PM, Fabian Bieler wrote: > The problem ist that if BaseLevel + MinLod is bigger than MaxLevel, min_lod > becomes bigger than max_lod, so the code below swaps min_lod and max_lod and > we send a max_lod to the driver that is bigger than MaxLevel. > > This could also be fixed by adding a condition like > if (sampler->min_lod > texobj->MaxLevel) > sampler->min_lod = texobj->MaxLevel; >
How about using the base and max level parameters in the sampler view ? According to the GL4.1 spec, 3.24: d = (levelbase + lambda + 0.5) - 1 where d is the mipmap array and lambda is the level of detail parameter lambda' = log2(rho(x,y)) + clamp(bias_texobj + bias_shader) lambda = clamp(lambda', lod_min, lod_max) where rho(x,y) is determined from texture coordinate derivatives. The base level need not affect the calculation of lambda (i.e. influence lod_min/lod_max) but is applied afterwards. If d ends up > the max level, results are undefined. Well, I hope this is somewhat correct. Christoph > > > > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/mesa-dev _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
