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spirv: Implement OpArrayLength for OpenGL

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Uses same NIR intrinsic as glsl_to_nir.  Make it an option so it is
easy later to move Vulkan drivers incrementally to use it.

Fixes piglit test spec/arb_gl_spirv/execution/ssbo/unsized-array-length.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3691
Fixes: 15e43907 ("iris: Enable ARB_gl_spirv and ARB_spirv_extensions")
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8136>
This commit is contained in:
Caio Marcelo de Oliveira Filho 2020-12-16 20:51:30 -08:00 • committed by Marge Bot
parent e9ab35ad4f
commit f65750d221
3 changed files with 43 additions and 21 deletions
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5
src/compiler/spirv/nir_spirv.h
View file

@ -69,6 +69,11 @@ struct spirv_to_nir_options {
/* Create a nir library. */
bool create_library;
/* Whether to use nir_intrinsic_deref_buffer_array_length intrinsic instead
* of nir_intrinsic_get_ssbo_size to lower OpArrayLength.
*/
bool use_deref_buffer_array_length;
/* Initial value for shader_info::float_controls_execution_mode,
* indicates hardware requirements rather than shader author intent
*/

58
src/compiler/spirv/vtn_variables.c
View file

@ -2449,30 +2449,46 @@ vtn_handle_variables(struct vtn_builder *b, SpvOp opcode,
"OpArrayLength must reference the last memeber of the "
"structure and that must be an array");
const uint32_t offset = ptr->type->offsets[field];
const uint32_t stride = ptr->type->members[field]->stride;
if (!ptr->block_index) {
if (b->options->use_deref_buffer_array_length) {
struct vtn_access_chain chain = {
.length = 0,
.length = 1,
.link = {
{ .mode = vtn_access_mode_literal, .id = field },
}
};
ptr = vtn_pointer_dereference(b, ptr, &chain);
vtn_assert(ptr->block_index);
struct vtn_pointer *array = vtn_pointer_dereference(b, ptr, &chain);
nir_ssa_def *array_length =
nir_build_deref_buffer_array_length(&b->nb, 32,
vtn_pointer_to_ssa(b, array));
vtn_push_nir_ssa(b, w[2], array_length);
} else {
const uint32_t offset = ptr->type->offsets[field];
const uint32_t stride = ptr->type->members[field]->stride;
if (!ptr->block_index) {
struct vtn_access_chain chain = {
.length = 0,
};
ptr = vtn_pointer_dereference(b, ptr, &chain);
vtn_assert(ptr->block_index);
}
nir_ssa_def *buf_size = nir_get_ssbo_size(&b->nb, ptr->block_index);
/* array_length = max(buffer_size - offset, 0) / stride */
nir_ssa_def *array_length =
nir_idiv(&b->nb,
nir_imax(&b->nb,
nir_isub(&b->nb,
buf_size,
nir_imm_int(&b->nb, offset)),
nir_imm_int(&b->nb, 0u)),
nir_imm_int(&b->nb, stride));
vtn_push_nir_ssa(b, w[2], array_length);
}
nir_ssa_def *buf_size = nir_get_ssbo_size(&b->nb, ptr->block_index);
/* array_length = max(buffer_size - offset, 0) / stride */
nir_ssa_def *array_length =
nir_idiv(&b->nb,
nir_imax(&b->nb,
nir_isub(&b->nb,
buf_size,
nir_imm_int(&b->nb, offset)),
nir_imm_int(&b->nb, 0u)),
nir_imm_int(&b->nb, stride));
vtn_push_nir_ssa(b, w[2], array_length);
break;
}

1
src/mesa/main/glspirv.c
View file

@ -244,6 +244,7 @@ _mesa_spirv_to_nir(struct gl_context *ctx,
const struct spirv_to_nir_options spirv_options = {
.environment = NIR_SPIRV_OPENGL,
.frag_coord_is_sysval = ctx->Const.GLSLFragCoordIsSysVal,
.use_deref_buffer_array_length = true,
.caps = ctx->Const.SpirVCapabilities,
.ubo_addr_format = nir_address_format_32bit_index_offset,
.ssbo_addr_format = nir_address_format_32bit_index_offset,