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pan/bi: Lower 8bit fragment outputs to 16bit

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Bifrost does not support passing fragment colors through 8 bit registers.

(Rewrote to use NIR helpers -Alyssa)

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Maciej Matuszczyk <maccraft123mc@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8427>
This commit is contained in:
Boris Brezillon 2020-11-20 16:57:46 +01:00 • committed by Marge Bot
parent 455cde2562
commit bef3fedc81
1 changed files with 46 additions and 0 deletions
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46
src/panfrost/bifrost/bifrost_compile.c
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@ -2063,6 +2063,51 @@ bi_optimize_nir(nir_shader *nir)
NIR_PASS(progress, nir, nir_convert_from_ssa, true); NIR_PASS(progress, nir, nir_convert_from_ssa, true);
} }
/* The cmdstream lowers 8-bit fragment output as 16-bit, so we need to do the
* same lowering here to zero-extend correctly */
static bool
bifrost_nir_lower_i8_fragout_impl(struct nir_builder *b,
nir_instr *instr, UNUSED void *data)
{
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_store_output)
return false;
if (nir_src_bit_size(intr->src[0]) != 8)
return false;
nir_alu_type type =
nir_alu_type_get_base_type(nir_intrinsic_src_type(intr));
assert(type == nir_type_int || nir_type_uint);
b->cursor = nir_before_instr(instr);
nir_ssa_def *cast = type == nir_type_int ?
nir_i2i(b, intr->src[0].ssa, 16) :
nir_u2u(b, intr->src[0].ssa, 16);
nir_intrinsic_set_src_type(intr, type | 16);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(cast));
return true;
}
static bool
bifrost_nir_lower_i8_fragout(nir_shader *shader)
{
if (shader->info.stage != MESA_SHADER_FRAGMENT)
return false;
return nir_shader_instructions_pass(shader,
bifrost_nir_lower_i8_fragout_impl,
nir_metadata_block_index | nir_metadata_dominance,
NULL);
}
panfrost_program * panfrost_program *
bifrost_compile_shader_nir(void *mem_ctx, nir_shader *nir, bifrost_compile_shader_nir(void *mem_ctx, nir_shader *nir,
const struct panfrost_compile_inputs *inputs) const struct panfrost_compile_inputs *inputs)
@ -2100,6 +2145,7 @@ bifrost_compile_shader_nir(void *mem_ctx, nir_shader *nir,
glsl_type_size, 0); glsl_type_size, 0);
NIR_PASS_V(nir, nir_lower_ssbo); NIR_PASS_V(nir, nir_lower_ssbo);
NIR_PASS_V(nir, pan_nir_lower_zs_store); NIR_PASS_V(nir, pan_nir_lower_zs_store);
NIR_PASS_V(nir, bifrost_nir_lower_i8_fragout);
// TODO: re-enable when fp16 is flipped on // TODO: re-enable when fp16 is flipped on
// NIR_PASS_V(nir, nir_lower_mediump_outputs); // NIR_PASS_V(nir, nir_lower_mediump_outputs);