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panfrost: Stub out lowering boilerplate

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Structure ourselves as a NIR pass replacing loads/stores with
unpacked/packed versions as necessary. Not actually functional yet.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5265>
This commit is contained in:
Alyssa Rosenzweig 2020-05-13 14:43:50 -04:00 • committed by Marge Bot
parent dbd72a8f94
commit e5fcc193f7
2 changed files with 113 additions and 0 deletions
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108
src/panfrost/util/pan_lower_framebuffer.c
View file

@ -125,3 +125,111 @@ pan_format_class_store(const struct util_format_description *desc, unsigned quir
return PAN_FORMAT_NATIVE;
}
/* Generic dispatches for un/pack regardless of format */
static nir_ssa_def *
pan_unpack(nir_builder *b,
const struct util_format_description *desc,
nir_ssa_def *packed)
{
/* Stub */
return packed;
}
static nir_ssa_def *
pan_pack(nir_builder *b,
const struct util_format_description *desc,
nir_ssa_def *unpacked)
{
/* Stub */
return unpacked;
}
static void
pan_lower_fb_store(nir_shader *shader,
nir_builder *b,
nir_intrinsic_instr *intr,
const struct util_format_description *desc,
unsigned quirks)
{
/* For stores, add conversion before */
nir_ssa_def *unpacked = nir_ssa_for_src(b, intr->src[1], 4);
nir_ssa_def *packed = pan_pack(b, desc, unpacked);
nir_intrinsic_instr *new =
nir_intrinsic_instr_create(shader, nir_intrinsic_store_raw_output_pan);
new->src[0] = nir_src_for_ssa(packed);
new->num_components = 4;
nir_builder_instr_insert(b, &new->instr);
}
static void
pan_lower_fb_load(nir_shader *shader,
nir_builder *b,
nir_intrinsic_instr *intr,
const struct util_format_description *desc,
unsigned quirks)
{
nir_intrinsic_instr *new = nir_intrinsic_instr_create(shader,
nir_intrinsic_load_raw_output_pan);
new->num_components = 4;
nir_ssa_dest_init(&new->instr, &new->dest, 4, 32, NULL);
nir_builder_instr_insert(b, &new->instr);
/* Convert the raw value */
nir_ssa_def *packed = &new->dest.ssa;
nir_ssa_def *unpacked = pan_unpack(b, desc, packed);
nir_src rewritten = nir_src_for_ssa(unpacked);
nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, rewritten, &intr->instr);
}
void
pan_lower_framebuffer(nir_shader *shader,
const struct util_format_description *desc,
unsigned quirks)
{
/* Blend shaders are represented as special fragment shaders */
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
nir_foreach_function(func, shader) {
nir_foreach_block(block, func->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
bool is_load = intr->intrinsic == nir_intrinsic_load_deref;
bool is_store = intr->intrinsic == nir_intrinsic_store_deref;
if (!(is_load || is_store))
continue;
/* Don't worry about MRT */
nir_variable *var = nir_intrinsic_get_var(intr, 0);
if (var->data.location != FRAG_RESULT_COLOR)
continue;
nir_builder b;
nir_builder_init(&b, func->impl);
if (is_store) {
b.cursor = nir_before_instr(instr);
pan_lower_fb_store(shader, &b, intr, desc, quirks);
} else {
b.cursor = nir_after_instr(instr);
pan_lower_fb_load(shader, &b, intr, desc, quirks);
}
nir_instr_remove(instr);
}
}
nir_metadata_preserve(func->impl, nir_metadata_block_index |
nir_metadata_dominance);
}
}

5
src/panfrost/util/pan_lower_framebuffer.h
View file

@ -43,4 +43,9 @@ nir_alu_type pan_unpacked_type_for_format(const struct util_format_description *
enum pan_format_class pan_format_class_load(const struct util_format_description *desc, unsigned quirks);
enum pan_format_class pan_format_class_store(const struct util_format_description *desc, unsigned quirks);
void
pan_lower_framebuffer(nir_shader *shader,
const struct util_format_description *desc,
unsigned quirks);
#endif