diff options
Diffstat (limited to 'src/glsl/nir/nir_intrinsics.h')
| -rw-r--r-- | src/glsl/nir/nir_intrinsics.h | 88 |
1 files changed, 46 insertions, 42 deletions
diff --git a/src/glsl/nir/nir_intrinsics.h b/src/glsl/nir/nir_intrinsics.h index 6b6cb32..9811fb3 100644 --- a/src/glsl/nir/nir_intrinsics.h +++ b/src/glsl/nir/nir_intrinsics.h @@ -255,56 +255,60 @@ SYSTEM_VALUE(num_work_groups, 3, 0) SYSTEM_VALUE(helper_invocation, 1, 0) /* - * The format of the indices depends on the type of the load. For uniforms, - * the first index is the base address and the second index is an offset that - * should be added to the base address. (This way you can determine in the - * back-end which variable is being accessed even in an array.) For inputs, - * the one and only index corresponds to the attribute slot. UBO loads also - * have a single index which is the base address to load from. + * Load operations pull data from some piece of GPU memory. All load + * operations operate in terms of offsets into some piece of theoretical + * memory. Loads from externally visible memory (UBO and SSBO) simply take a + * byte offset as a source. Loads from opaque memory (uniforms, inputs, etc.) + * take a base+offset pair where the base (const_index[0]) gives the location + * of the start of the variable being loaded and and the offset source is a + * offset into that variable. * - * UBO loads have a (possibly constant) source which is the UBO buffer index. - * For each type of load, the _indirect variant has one additional source - * (the second in the case of UBO's) that is the is an indirect to be added to - * the constant address or base offset to compute the final offset. + * Some load operations such as UBO/SSBO load and per_vertex loads take an + * additional source to specify which UBO/SSBO/vertex to load from. * - * For vector backends, the address is in terms of one vec4, and so each array - * element is +4 scalar components from the previous array element. For scalar - * backends, the address is in terms of a single 4-byte float/int and arrays - * elements begin immediately after the previous array element. + * The exact address type depends on the lowering pass that generates the + * load/store intrinsics. Typically, this is vec4 units for things such as + * varying slots and float units for fragment shader inputs. UBO and SSBO + * offsets are always in bytes. */ -#define LOAD(name, extra_srcs, indices, flags) \ - INTRINSIC(load_##name, extra_srcs, ARR(1), true, 0, 0, indices, flags) \ - INTRINSIC(load_##name##_indirect, extra_srcs + 1, ARR(1, 1), \ - true, 0, 0, indices, flags) +#define LOAD(name, srcs, indices, flags) \ + INTRINSIC(load_##name, srcs, ARR(1, 1, 1, 1), true, 0, 0, indices, flags) -LOAD(uniform, 0, 2, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) -LOAD(ubo, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) -LOAD(input, 0, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) -LOAD(per_vertex_input, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) -LOAD(ssbo, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE) -LOAD(output, 0, 1, NIR_INTRINSIC_CAN_ELIMINATE) -LOAD(per_vertex_output, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE) -LOAD(shared, 0, 1, NIR_INTRINSIC_CAN_ELIMINATE) +/* src[] = { offset }. const_index[] = { base } */ +LOAD(uniform, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) +/* src[] = { buffer_index, offset }. No const_index */ +LOAD(ubo, 2, 0, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) +/* src[] = { offset }. const_index[] = { base } */ +LOAD(input, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) +/* src[] = { vertex, offset }. const_index[] = { base } */ +LOAD(per_vertex_input, 2, 1, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER) +/* src[] = { buffer_index, offset }. No const_index */ +LOAD(ssbo, 2, 0, NIR_INTRINSIC_CAN_ELIMINATE) +/* src[] = { offset }. const_index[] = { base } */ +LOAD(output, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE) +/* src[] = { vertex, offset }. const_index[] = { base } */ +LOAD(per_vertex_output, 2, 1, NIR_INTRINSIC_CAN_ELIMINATE) +/* src[] = { offset }. const_index[] = { base } */ +LOAD(shared, 1, 1, NIR_INTRINSIC_CAN_ELIMINATE) /* - * Stores work the same way as loads, except now the first register input is - * the value or array to store and the optional second input is the indirect - * offset. SSBO stores are similar, but they accept an extra source for the - * block index and an extra index with the writemask to use. + * Stores work the same way as loads, except now the first source is the value + * to store and the second (and possibly third) source specify where to store + * the value. SSBO and shared memory stores also have a write mask as + * const_index[0]. */ -#define STORE(name, extra_srcs, extra_srcs_size, extra_indices, flags) \ - INTRINSIC(store_##name, 1 + extra_srcs, \ - ARR(0, extra_srcs_size, extra_srcs_size, extra_srcs_size), \ - false, 0, 0, 1 + extra_indices, flags) \ - INTRINSIC(store_##name##_indirect, 2 + extra_srcs, \ - ARR(0, 1, extra_srcs_size, extra_srcs_size), \ - false, 0, 0, 1 + extra_indices, flags) +#define STORE(name, srcs, indices, flags) \ + INTRINSIC(store_##name, srcs, ARR(0, 1, 1, 1), false, 0, 0, indices, flags) -STORE(output, 0, 0, 0, 0) -STORE(per_vertex_output, 1, 1, 0, 0) -STORE(ssbo, 1, 1, 1, 0) -STORE(shared, 0, 0, 1, 0) +/* src[] = { value, offset }. const_index[] = { base } */ +STORE(output, 2, 1, 0) +/* src[] = { value, vertex, offset }. const_index[] = { base } */ +STORE(per_vertex_output, 3, 1, 0) +/* src[] = { value, block_index, offset }. const_index[] = { write_mask } */ +STORE(ssbo, 3, 1, 0) +/* src[] = { value, offset }. const_index[] = { base, write_mask } */ +STORE(shared, 2, 1, 0) -LAST_INTRINSIC(store_shared_indirect) +LAST_INTRINSIC(store_shared) |