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spirv: Add support for SPV_EXT_physical_storage_buffer

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Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Jason Ekstrand
2019-01-19 10:23:28 -06:00
parent fb282a68bc
commit 86e5f76d3d
5 changed files with 55 additions and 3 deletions
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43
src/compiler/spirv/vtn_variables.c
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@@ -62,6 +62,7 @@ vtn_pointer_is_external_block(struct vtn_builder *b,
{
return ptr->mode == vtn_variable_mode_ssbo ||
ptr->mode == vtn_variable_mode_ubo ||
ptr->mode == vtn_variable_mode_phys_ssbo ||
ptr->mode == vtn_variable_mode_push_constant ||
(ptr->mode == vtn_variable_mode_workgroup &&
b->options->lower_workgroup_access_to_offsets);
@@ -1521,6 +1522,11 @@ apply_var_decoration(struct vtn_builder *b,
/* HLSL semantic decorations can safely be ignored by the driver. */
break;
case SpvDecorationRestrictPointerEXT:
case SpvDecorationAliasedPointerEXT:
/* TODO: We should actually plumb alias information through NIR. */
break;
default:
vtn_fail("Unhandled decoration");
}
@@ -1682,6 +1688,10 @@ vtn_storage_class_to_mode(struct vtn_builder *b,
mode = vtn_variable_mode_ssbo;
nir_mode = nir_var_mem_ssbo;
break;
case SpvStorageClassPhysicalStorageBufferEXT:
mode = vtn_variable_mode_phys_ssbo;
nir_mode = nir_var_mem_global;
break;
case SpvStorageClassUniformConstant:
mode = vtn_variable_mode_uniform;
nir_mode = nir_var_uniform;
@@ -1760,13 +1770,23 @@ vtn_pointer_to_ssa(struct vtn_builder *b, struct vtn_pointer *ptr)
}
} else {
if (vtn_pointer_is_external_block(b, ptr) &&
vtn_type_contains_block(b, ptr->type)) {
vtn_type_contains_block(b, ptr->type) &&
ptr->mode != vtn_variable_mode_phys_ssbo) {
const unsigned bit_size = glsl_get_bit_size(ptr->ptr_type->type);
const unsigned num_components =
glsl_get_vector_elements(ptr->ptr_type->type);
/* In this case, we're looking for a block index and not an actual
* deref.
*
* For PhysicalStorageBufferEXT pointers, we don't have a block index
* at all because we get the pointer directly from the client. This
* assumes that there will never be a SSBO binding variable using the
* PhysicalStorageBufferEXT storage class. This assumption appears
* to be correct according to the Vulkan spec because the table,
* "Shader Resource and Storage Class Correspondence," the only the
* Uniform storage class with BufferBlock or the StorageBuffer
* storage class with Block can be used.
*/
if (!ptr->block_index) {
/* If we don't have a block_index then we must be a pointer to the
@@ -1843,7 +1863,8 @@ vtn_pointer_from_ssa(struct vtn_builder *b, nir_ssa_def *ssa,
assert(ssa->bit_size == 32 && ssa->num_components == 1);
ptr->deref = nir_build_deref_cast(&b->nb, ssa, nir_mode,
glsl_get_bare_type(deref_type), 0);
} else if (vtn_type_contains_block(b, ptr->type)) {
} else if (vtn_type_contains_block(b, ptr->type) &&
ptr->mode != vtn_variable_mode_phys_ssbo) {
/* This is a pointer to somewhere in an array of blocks, not a
* pointer to somewhere inside the block. We squashed it into a
* random vector type before so just pick off the first channel and
@@ -1853,6 +1874,15 @@ vtn_pointer_from_ssa(struct vtn_builder *b, nir_ssa_def *ssa,
} else {
/* This is a pointer to something internal or a pointer inside a
* block. It's just a regular cast.
*
* For PhysicalStorageBufferEXT pointers, we don't have a block index
* at all because we get the pointer directly from the client. This
* assumes that there will never be a SSBO binding variable using the
* PhysicalStorageBufferEXT storage class. This assumption appears
* to be correct according to the Vulkan spec because the table,
* "Shader Resource and Storage Class Correspondence," the only the
* Uniform storage class with BufferBlock or the StorageBuffer
* storage class with Block can be used.
*/
ptr->deref = nir_build_deref_cast(&b->nb, ssa, nir_mode,
ptr_type->deref->type,
@@ -1933,6 +1963,12 @@ vtn_create_variable(struct vtn_builder *b, struct vtn_value *val,
case vtn_variable_mode_push_constant:
b->shader->num_uniforms = vtn_type_block_size(b, type);
break;
case vtn_variable_mode_phys_ssbo:
vtn_fail("Cannot create a variable with the "
"PhysicalStorageBufferEXT storage class");
break;
default:
/* No tallying is needed */
break;
@@ -2087,6 +2123,9 @@ vtn_create_variable(struct vtn_builder *b, struct vtn_value *val,
case vtn_variable_mode_cross_workgroup:
/* These don't need actual variables. */
break;
case vtn_variable_mode_phys_ssbo:
unreachable("Should have been caught before");
}
if (initializer) {