diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp index cac958d49c1..5ee04dece88 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp @@ -161,3 +161,58 @@ namespace brw { } } } + +namespace { + namespace image_validity { + /** + * Check whether there is an image bound at the given index and write + * the comparison result to f0.0. Returns an appropriate predication + * mode to use on subsequent image operations. + */ + brw_predicate + emit_surface_check(const fs_builder &bld, const fs_reg &image) + { + const brw_device_info *devinfo = bld.shader->devinfo; + const fs_reg size = offset(image, bld, BRW_IMAGE_PARAM_SIZE_OFFSET); + + if (devinfo->gen == 7 && !devinfo->is_haswell) { + /* Check the first component of the size field to find out if the + * image is bound. Necessary on IVB for typed atomics because + * they don't seem to respect null surfaces and will happily + * corrupt or read random memory when no image is bound. + */ + bld.CMP(bld.null_reg_ud(), + retype(size, BRW_REGISTER_TYPE_UD), + fs_reg(0), BRW_CONDITIONAL_NZ); + + return BRW_PREDICATE_NORMAL; + } else { + /* More recent platforms implement compliant behavior when a null + * surface is bound. + */ + return BRW_PREDICATE_NONE; + } + } + + /** + * Check whether the provided coordinates are within the image bounds + * and write the comparison result to f0.0. Returns an appropriate + * predication mode to use on subsequent image operations. + */ + brw_predicate + emit_bounds_check(const fs_builder &bld, const fs_reg &image, + const fs_reg &addr, unsigned dims) + { + const fs_reg size = offset(image, bld, BRW_IMAGE_PARAM_SIZE_OFFSET); + + for (unsigned c = 0; c < dims; ++c) + set_predicate(c == 0 ? BRW_PREDICATE_NONE : BRW_PREDICATE_NORMAL, + bld.CMP(bld.null_reg_ud(), + offset(retype(addr, BRW_REGISTER_TYPE_UD), bld, c), + offset(size, bld, c), + BRW_CONDITIONAL_L)); + + return BRW_PREDICATE_NORMAL; + } + } +} |