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zink: support nir_intrinsic_store_ssbo 

this is gross, but it works

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8628>
This commit is contained in:
Mike Blumenkrantz 2020-08-07 19:17:34 -04:00 committed by Marge Bot
parent b0847a4324
commit 313c77f326
1 changed files with 98 additions and 0 deletions
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98
src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
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@ -2342,6 +2342,104 @@ emit_intrinsic(struct ntv_context *ctx, nir_intrinsic_instr *intr)
emit_load_bo(ctx, intr);
break;
/* TODO: would be great to refactor this in with emit_load_bo() */
case nir_intrinsic_store_ssbo: {
nir_const_value *const_block_index = nir_src_as_const_value(intr->src[1]);
assert(const_block_index);
SpvId bo = ctx->ssbos[const_block_index->u32];
unsigned bit_size = nir_src_bit_size(intr->src[0]);
SpvId uint_type = get_uvec_type(ctx, 32, 1);
SpvId one = emit_uint_const(ctx, 32, 1);
/* number of components being stored */
unsigned wrmask = nir_intrinsic_write_mask(intr);
unsigned num_components = util_bitcount(wrmask);
/* we need to grab 2x32 to fill the 64bit value */
bool is_64bit = bit_size == 64;
/* an id of the array stride in bytes */
SpvId vec4_size = emit_uint_const(ctx, 32, sizeof(uint32_t) * 4);
/* an id of an array member in bytes */
SpvId uint_size = emit_uint_const(ctx, 32, sizeof(uint32_t));
/* we grab a single array member at a time, so it's a pointer to a uint */
SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
SpvStorageClassStorageBuffer,
uint_type);
/* our generated uniform has a memory layout like
*
* struct {
* vec4 base[array_size];
* };
*
* where 'array_size' is set as though every member of the ubo takes up a vec4,
* even if it's only a vec2 or a float.
*
* first, access 'base'
*/
SpvId member = emit_uint_const(ctx, 32, 0);
/* this is the offset (in bytes) that we're accessing:
* it may be a const value or it may be dynamic in the shader
*/
SpvId offset = get_src(ctx, &intr->src[2]);
/* convert offset to an array index for 'base' to determine which vec4 to access */
SpvId vec_offset = emit_binop(ctx, SpvOpUDiv, uint_type, offset, vec4_size);
/* use the remainder to calculate the byte offset in the vec, which tells us the member
* that we're going to access
*/
SpvId vec_member_offset = emit_binop(ctx, SpvOpUDiv, uint_type,
emit_binop(ctx, SpvOpUMod, uint_type, offset, vec4_size),
uint_size);
SpvId value = get_src(ctx, &intr->src[0]);
/* OpAccessChain takes an array of indices that drill into a hierarchy based on the type:
* index 0 is accessing 'base'
* index 1 is accessing 'base[index 1]'
* index 2 is accessing 'base[index 1][index 2]'
*
* we must perform the access this way in case src[1] is dynamic because there's
* no other spirv method for using an id to access a member of a composite, as
* (composite|vector)_extract both take literals
*/
unsigned write_count = 0;
SpvId src_base_type = get_uvec_type(ctx, nir_src_bit_size(intr->src[0]), 1);
for (unsigned i = 0; write_count < num_components; i++) {
if (wrmask & (1 << i)) {
SpvId component = nir_src_num_components(intr->src[0]) > 1 ?
spirv_builder_emit_composite_extract(&ctx->builder, src_base_type, value, &i, 1) :
value;
SpvId component_split;
if (is_64bit)
component_split = emit_bitcast(ctx, get_uvec_type(ctx, 32, 2), component);
for (unsigned j = 0; j < 1 + !!is_64bit; j++) {
if (j)
vec_member_offset = emit_binop(ctx, SpvOpIAdd, uint_type, vec_member_offset, one);
SpvId indices[3] = { member, vec_offset, vec_member_offset };
SpvId ptr = spirv_builder_emit_access_chain(&ctx->builder, pointer_type,
bo, indices,
ARRAY_SIZE(indices));
if (is_64bit)
component = spirv_builder_emit_composite_extract(&ctx->builder, uint_type, component_split, &j, 1);
spirv_builder_emit_atomic_store(&ctx->builder, ptr, SpvScopeWorkgroup, 0, component);
}
write_count++;
} else if (is_64bit)
/* we're doing 32bit stores here, so we need to increment correctly here */
vec_member_offset = emit_binop(ctx, SpvOpIAdd, uint_type, vec_member_offset, one);
/* increment to the next vec4 member index for the next store */
vec_member_offset = emit_binop(ctx, SpvOpIAdd, uint_type, vec_member_offset, one);
if (i == 1 && is_64bit) {
vec_offset = emit_binop(ctx, SpvOpIAdd, uint_type, vec_offset, one);
vec_member_offset = emit_uint_const(ctx, 32, 0);
}
}
break;
}
case nir_intrinsic_discard:
emit_discard(ctx, intr);
break;