This week the main focus was on image reading, while also reworking previously sent patches about image attributes. Currently I have a working prototype for writing CL_FLOAT images, although I'm not ready to push it upstream yet. The current status is summarized in the following list.
- Mesa is now able to set up compute texture and sampler resources (code). Most of the code was already present, only initialization and emission of the atoms responsible for sampler and texture resource (sampler view) state setup had to be added. I also had my mentor's code as a starting point.
- The prototype libclc implementation uses the llvm.R600.tex intrinsic with hardcoded texture id, sampler and coord types (code).
- No modification of llvm is required.
The image attribute getters have undergone a few modifications. The mechanism which assigns a compile-time constant ID to the kernel image arguments, which was part of the image attribute intrinsics replacer pass, has been factored out into a separate pass (patch). Simultaneously, the image attribute replacer pass has been deleted, since the reason of the pass was the compile-time constant ID generation. This way the attribute getters can be implement in libclc roughly as follows (see this patch for additional details):
get_image_attribute(get_image_id(image), attribute);
An additional benefit of this approach is that the image ID pass can be extended with different kind of IDs, e.g. resource IDs (like RAT ID) and sampler IDs.
