Hi,
I think this problem has been reported before. It's most likely caused
by a compiler bug of your OpenCL driver. See thread "OpenCL problem with
NVidia Optimus" in darktable-devel.
A work-around was found by the TO. Replace kernel blendop_mask_RAW in
blendop.cl with the following code. It is functional identical but
tricks to compiler to not trigger the bug.
Let's hope that the issue gets fixed by NVIDIA soon.
Ulrich
__kernel void
blendop_mask_RAW (__read_only image2d_t in_a, __read_only image2d_t
in_b, __write_only image2d_t mask, const int width, const int height,
const float gopacity, const int blendif, global const float
*blendif_parameters)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
float4 a = read_imagef(in_a, sampleri, (int2)(x, y));
float4 b = read_imagef(in_b, sampleri, (int2)(x, y));
float bif = blendif_factor_Lab(a, b, blendif, blendif_parameters);
float opacity = gopacity * bif;
opacity /= bif;
write_imagef(mask, (int2)(x, y), opacity);
}
Am 24.11.2012 14:10, schrieb Rene Weiss:
> Hi
>
> When i build darktable (1.1rc2 or the version from git) then i can't
> activate the opencl support (the field under "core options "is grayed out).
>
> darktable-cltest reports "failed to compile program `blendop.cl".
>
> I uploaded the full output of darktable-cltest to:
> http://pastebin.com/gNsgRp6X
>
> I think that some library is missing or the wrong version, but i don't
> know which.
>
> Does someone here know how to fix this problem?
>
> thanks,
> René
>
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