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mesa/src/panfrost/util/pan_lower_framebuffer.c

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/*
* Copyright (C) 2020 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors (Collabora):
* Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
*/
/**
* Implements framebuffer format conversions in software for Midgard/Bifrost
* blend shaders. This pass is designed for a single render target; Midgard
* duplicates blend shaders for MRT to simplify everything. A particular
* framebuffer format may be categorized as 1) typed load available, 2) typed
* unpack available, or 3) software unpack only, and likewise for stores. The
* first two types are handled in the compiler backend directly, so this module
* is responsible for identifying type 3 formats (hardware dependent) and
* inserting appropriate ALU code to perform the conversion from the packed
* type to a designated unpacked type, and vice versa.
*
* The unpacked type depends on the format:
*
* - For 32-bit float formats or >8-bit UNORM, 32-bit floats.
* - For other floats, 16-bit floats.
* - For 32-bit ints, 32-bit ints.
* - For 8-bit ints, 8-bit ints.
* - For other ints, 16-bit ints.
*
* The rationale is to optimize blending and logic op instructions by using the
* smallest precision necessary to store the pixel losslessly.
*/
#include "compiler/nir/nir.h"
#include "compiler/nir/nir_builder.h"
#include "compiler/nir/nir_format_convert.h"
#include "util/format/u_format.h"
#include "pan_lower_framebuffer.h"
/* Determines the unpacked type best suiting a given format, so the rest of the
* pipeline may be adjusted accordingly */
nir_alu_type
pan_unpacked_type_for_format(const struct util_format_description *desc)
{
int c = util_format_get_first_non_void_channel(desc->format);
if (c == -1)
unreachable("Void format not renderable");
bool large = (desc->channel[c].size > 16);
bool large_norm = (desc->channel[c].size > 8);
bool bit8 = (desc->channel[c].size == 8);
assert(desc->channel[c].size <= 32);
if (desc->channel[c].normalized)
return large_norm ? nir_type_float32 : nir_type_float16;
switch (desc->channel[c].type) {
case UTIL_FORMAT_TYPE_UNSIGNED:
return bit8 ? nir_type_uint8 :
large ? nir_type_uint32 : nir_type_uint16;
case UTIL_FORMAT_TYPE_SIGNED:
return bit8 ? nir_type_int8 :
large ? nir_type_int32 : nir_type_int16;
case UTIL_FORMAT_TYPE_FLOAT:
return large ? nir_type_float32 : nir_type_float16;
default:
unreachable("Format not renderable");
}
}
static bool
pan_is_format_native(const struct util_format_description *desc, bool broken_ld_special, bool is_store)
{
if (is_store || broken_ld_special)
return false;
if (util_format_is_pure_integer(desc->format) || util_format_is_float(desc->format))
return false;
/* Some formats are missing as typed but have unpacks */
if (desc->format == PIPE_FORMAT_R11G11B10_FLOAT)
return false;
return true;
}
/* Software packs/unpacks, by format class. Packs take in the pixel value typed
* as `pan_unpacked_type_for_format` of the format and return an i32vec4
* suitable for storing (with components replicated to fill). Unpacks do the
* reverse but cannot rely on replication. */
static nir_ssa_def *
pan_replicate(nir_builder *b, nir_ssa_def *v, unsigned num_components)
{
nir_ssa_def *replicated[4];
for (unsigned i = 0; i < 4; ++i)
replicated[i] = nir_channel(b, v, i % num_components);
return nir_vec(b, replicated, 4);
}
static nir_ssa_def *
pan_unpack_pure_32(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
return nir_channels(b, pack, (1 << num_components) - 1);
}
/* Pure x16 formats are x16 unpacked, so it's similar, but we need to pack
* upper/lower halves of course */
static nir_ssa_def *
pan_pack_pure_16(nir_builder *b, nir_ssa_def *v, unsigned num_components)
{
nir_ssa_def *v4 = pan_replicate(b, v, num_components);
nir_ssa_def *lo = nir_pack_32_2x16(b, nir_channels(b, v4, 0x3 << 0));
nir_ssa_def *hi = nir_pack_32_2x16(b, nir_channels(b, v4, 0x3 << 2));
return nir_vec4(b, lo, hi, lo, hi);
}
static nir_ssa_def *
pan_unpack_pure_16(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
nir_ssa_def *unpacked[4];
assert(num_components <= 4);
for (unsigned i = 0; i < num_components; i += 2) {
nir_ssa_def *halves =
nir_unpack_32_2x16(b, nir_channel(b, pack, i >> 1));
unpacked[i + 0] = nir_channel(b, halves, 0);
unpacked[i + 1] = nir_channel(b, halves, 1);
}
return nir_pad_vec4(b, nir_vec(b, unpacked, num_components));
}
static nir_ssa_def *
pan_pack_reorder(nir_builder *b,
const struct util_format_description *desc,
nir_ssa_def *v)
{
unsigned swizzle[4] = { 0, 1, 2, 3 };
for (unsigned i = 0; i < v->num_components; i++) {
if (desc->swizzle[i] <= PIPE_SWIZZLE_W)
swizzle[i] = desc->swizzle[i];
}
return nir_swizzle(b, v, swizzle, v->num_components);
}
static nir_ssa_def *
pan_unpack_reorder(nir_builder *b,
const struct util_format_description *desc,
nir_ssa_def *v)
{
unsigned swizzle[4] = { 0, 1, 2, 3 };
for (unsigned i = 0; i < v->num_components; i++) {
if (desc->swizzle[i] <= PIPE_SWIZZLE_W)
swizzle[desc->swizzle[i]] = i;
}
return nir_swizzle(b, v, swizzle, v->num_components);
}
static nir_ssa_def *
pan_replicate_4(nir_builder *b, nir_ssa_def *v)
{
return nir_vec4(b, v, v, v, v);
}
static nir_ssa_def *
pan_pack_pure_8(nir_builder *b, nir_ssa_def *v, unsigned num_components)
{
return pan_replicate_4(b, nir_pack_32_4x8(b, pan_replicate(b, v, num_components)));
}
static nir_ssa_def *
pan_unpack_pure_8(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
nir_ssa_def *unpacked = nir_unpack_32_4x8(b, nir_channel(b, pack, 0));
return nir_channels(b, unpacked, (1 << num_components) - 1);
}
/* For <= 8-bits per channel, [U,S]NORM formats are packed like [U,S]NORM 8,
* with zeroes spacing out each component as needed */
static nir_ssa_def *
pan_pack_norm(nir_builder *b, nir_ssa_def *v,
unsigned x, unsigned y, unsigned z, unsigned w,
bool is_signed)
{
/* If a channel has N bits, 1.0 is encoded as 2^N - 1 for UNORMs and
* 2^(N-1) - 1 for SNORMs */
nir_ssa_def *scales =
is_signed ?
nir_imm_vec4_16(b,
(1 << (x - 1)) - 1, (1 << (y - 1)) - 1,
(1 << (z - 1)) - 1, (1 << (w - 1)) - 1) :
nir_imm_vec4_16(b,
(1 << x) - 1, (1 << y) - 1,
(1 << z) - 1, (1 << w) - 1);
/* If a channel has N bits, we pad out to the byte by (8 - N) bits */
nir_ssa_def *shifts = nir_imm_ivec4(b, 8 - x, 8 - y, 8 - z, 8 - w);
nir_ssa_def *clamped =
is_signed ?
nir_fsat_signed_mali(b, nir_pad_vec4(b, v)) :
nir_fsat(b, nir_pad_vec4(b, v));
nir_ssa_def *f = nir_fmul(b, clamped, scales);
nir_ssa_def *u8 = nir_f2u8(b, nir_fround_even(b, f));
nir_ssa_def *s = nir_ishl(b, u8, shifts);
nir_ssa_def *repl = nir_pack_32_4x8(b, s);
return pan_replicate_4(b, repl);
}
static nir_ssa_def *
pan_pack_unorm(nir_builder *b, nir_ssa_def *v,
unsigned x, unsigned y, unsigned z, unsigned w)
{
return pan_pack_norm(b, v, x, y, z, w, false);
}
static nir_ssa_def *
pan_pack_snorm(nir_builder *b, nir_ssa_def *v,
unsigned x, unsigned y, unsigned z, unsigned w)
{
return pan_pack_norm(b, v, x, y, z, w, true);
}
/* RGB10_A2 is packed in the tilebuffer as the bottom 3 bytes being the top
* 8-bits of RGB and the top byte being RGBA as 2-bits packed. As imirkin
* pointed out, this means free conversion to RGBX8 */
static nir_ssa_def *
pan_pack_unorm_1010102(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *scale = nir_imm_vec4(b, 1023.0, 1023.0, 1023.0, 3.0);
nir_ssa_def *s = nir_f2u32(b, nir_fround_even(b, nir_fmul(b, nir_fsat(b, v), scale)));
nir_ssa_def *top8 = nir_ushr(b, s, nir_imm_ivec4(b, 0x2, 0x2, 0x2, 0x2));
nir_ssa_def *top8_rgb = nir_pack_32_4x8(b, nir_u2u8(b, top8));
nir_ssa_def *bottom2 = nir_iand(b, s, nir_imm_ivec4(b, 0x3, 0x3, 0x3, 0x3));
nir_ssa_def *top =
nir_ior(b,
nir_ior(b,
nir_ishl(b, nir_channel(b, bottom2, 0), nir_imm_int(b, 24 + 0)),
nir_ishl(b, nir_channel(b, bottom2, 1), nir_imm_int(b, 24 + 2))),
nir_ior(b,
nir_ishl(b, nir_channel(b, bottom2, 2), nir_imm_int(b, 24 + 4)),
nir_ishl(b, nir_channel(b, bottom2, 3), nir_imm_int(b, 24 + 6))));
nir_ssa_def *p = nir_ior(b, top, top8_rgb);
return pan_replicate_4(b, p);
}
/* On the other hand, the pure int RGB10_A2 is identical to the spec */
static nir_ssa_def *
pan_pack_int_1010102(nir_builder *b, nir_ssa_def *v, bool is_signed)
{
v = nir_u2u32(b, v);
/* Clamp the values */
if (is_signed) {
v = nir_imin(b, v, nir_imm_ivec4(b, 511, 511, 511, 1));
v = nir_imax(b, v, nir_imm_ivec4(b, -512, -512, -512, -2));
} else {
v = nir_umin(b, v, nir_imm_ivec4(b, 1023, 1023, 1023, 3));
}
v = nir_ishl(b, v, nir_imm_ivec4(b, 0, 10, 20, 30));
v = nir_ior(b,
nir_ior(b, nir_channel(b, v, 0), nir_channel(b, v, 1)),
nir_ior(b, nir_channel(b, v, 2), nir_channel(b, v, 3)));
return pan_replicate_4(b, v);
}
static nir_ssa_def *
pan_unpack_int_1010102(nir_builder *b, nir_ssa_def *packed, bool is_signed)
{
nir_ssa_def *v = pan_replicate_4(b, nir_channel(b, packed, 0));
/* Left shift all components so the sign bit is on the MSB, and
* can be extended by ishr(). The ishl()+[u,i]shr() combination
* sets all unused bits to 0 without requiring a mask.
*/
v = nir_ishl(b, v, nir_imm_ivec4(b, 22, 12, 2, 0));
if (is_signed)
v = nir_ishr(b, v, nir_imm_ivec4(b, 22, 22, 22, 30));
else
v = nir_ushr(b, v, nir_imm_ivec4(b, 22, 22, 22, 30));
return nir_i2i16(b, v);
}
/* NIR means we can *finally* catch a break */
static nir_ssa_def *
pan_pack_r11g11b10(nir_builder *b, nir_ssa_def *v)
{
return pan_replicate_4(b, nir_format_pack_11f11f10f(b,
nir_f2f32(b, v)));
}
static nir_ssa_def *
pan_unpack_r11g11b10(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *f32 = nir_format_unpack_11f11f10f(b, nir_channel(b, v, 0));
nir_ssa_def *f16 = nir_f2fmp(b, f32);
/* Extend to vec4 with alpha */
nir_ssa_def *components[4] = {
nir_channel(b, f16, 0),
nir_channel(b, f16, 1),
nir_channel(b, f16, 2),
nir_imm_float16(b, 1.0)
};
return nir_vec(b, components, 4);
}
/* Wrapper around sRGB conversion */
static nir_ssa_def *
pan_linear_to_srgb(nir_builder *b, nir_ssa_def *linear)
{
nir_ssa_def *rgb = nir_channels(b, linear, 0x7);
/* TODO: fp16 native conversion */
nir_ssa_def *srgb = nir_f2fmp(b,
nir_format_linear_to_srgb(b, nir_f2f32(b, rgb)));
nir_ssa_def *comp[4] = {
nir_channel(b, srgb, 0),
nir_channel(b, srgb, 1),
nir_channel(b, srgb, 2),
nir_channel(b, linear, 3),
};
return nir_vec(b, comp, 4);
}
/* 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)
{
if (desc->is_array) {
int c = util_format_get_first_non_void_channel(desc->format);
assert(c >= 0);
struct util_format_channel_description d = desc->channel[c];
if (d.size == 32 || d.size == 16) {
assert(!d.normalized);
assert(d.type == UTIL_FORMAT_TYPE_FLOAT || d.pure_integer);
return d.size == 32 ? pan_unpack_pure_32(b, packed, desc->nr_channels) :
pan_unpack_pure_16(b, packed, desc->nr_channels);
} else if (d.size == 8) {
assert(d.pure_integer);
return pan_unpack_pure_8(b, packed, desc->nr_channels);
} else {
unreachable("Unrenderable size");
}
}
switch (desc->format) {
case PIPE_FORMAT_R10G10B10A2_UINT:
case PIPE_FORMAT_B10G10R10A2_UINT:
return pan_unpack_int_1010102(b, packed, false);
case PIPE_FORMAT_R10G10B10A2_SINT:
case PIPE_FORMAT_B10G10R10A2_SINT:
return pan_unpack_int_1010102(b, packed, true);
case PIPE_FORMAT_R11G11B10_FLOAT:
return pan_unpack_r11g11b10(b, packed);
default:
break;
}
fprintf(stderr, "%s\n", desc->name);
unreachable("Unknown format");
}
static nir_ssa_def *
pan_pack(nir_builder *b,
const struct util_format_description *desc,
nir_ssa_def *unpacked)
{
if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB)
unpacked = pan_linear_to_srgb(b, unpacked);
if (util_format_is_unorm8(desc))
return pan_pack_unorm(b, unpacked, 8, 8, 8, 8);
if (util_format_is_snorm8(desc->format))
return pan_pack_snorm(b, unpacked, 8, 8, 8, 8);
if (desc->is_array) {
int c = util_format_get_first_non_void_channel(desc->format);
assert(c >= 0);
struct util_format_channel_description d = desc->channel[c];
if (d.size == 32 || d.size == 16) {
assert(!d.normalized);
assert(d.type == UTIL_FORMAT_TYPE_FLOAT || d.pure_integer);
return d.size == 32 ?
pan_replicate(b, unpacked, desc->nr_channels) :
pan_pack_pure_16(b, unpacked, desc->nr_channels);
} else if (d.size == 8) {
assert(d.pure_integer);
return pan_pack_pure_8(b, unpacked, desc->nr_channels);
} else {
unreachable("Unrenderable size");
}
}
switch (desc->format) {
case PIPE_FORMAT_B4G4R4A4_UNORM:
case PIPE_FORMAT_B4G4R4X4_UNORM:
case PIPE_FORMAT_A4R4_UNORM:
case PIPE_FORMAT_R4A4_UNORM:
case PIPE_FORMAT_A4B4G4R4_UNORM:
case PIPE_FORMAT_R4G4B4A4_UNORM:
return pan_pack_unorm(b, unpacked, 4, 4, 4, 4);
case PIPE_FORMAT_B5G5R5A1_UNORM:
case PIPE_FORMAT_R5G5B5A1_UNORM:
return pan_pack_unorm(b, unpacked, 5, 6, 5, 1);
case PIPE_FORMAT_R5G6B5_UNORM:
case PIPE_FORMAT_B5G6R5_UNORM:
return pan_pack_unorm(b, unpacked, 5, 6, 5, 0);
case PIPE_FORMAT_R10G10B10A2_UNORM:
case PIPE_FORMAT_B10G10R10A2_UNORM:
return pan_pack_unorm_1010102(b, unpacked);
case PIPE_FORMAT_R10G10B10A2_UINT:
case PIPE_FORMAT_B10G10R10A2_UINT:
return pan_pack_int_1010102(b, unpacked, false);
case PIPE_FORMAT_R10G10B10A2_SINT:
case PIPE_FORMAT_B10G10R10A2_SINT:
return pan_pack_int_1010102(b, unpacked, true);
case PIPE_FORMAT_R11G11B10_FLOAT:
return pan_pack_r11g11b10(b, unpacked);
default:
break;
}
fprintf(stderr, "%s\n", desc->name);
unreachable("Unknown format");
}
static void
pan_lower_fb_store(nir_shader *shader,
nir_builder *b,
nir_intrinsic_instr *intr,
const struct util_format_description *desc,
bool reorder_comps)
{
/* For stores, add conversion before */
nir_ssa_def *unpacked =
nir_ssa_for_src(b, intr->src[1], intr->num_components);
unpacked = nir_pad_vec4(b, unpacked);
/* Re-order the components */
if (reorder_comps)
unpacked = pan_pack_reorder(b, desc, unpacked);
nir_ssa_def *packed = pan_pack(b, desc, unpacked);
nir_store_raw_output_pan(b, packed);
}
static nir_ssa_def *
pan_sample_id(nir_builder *b, int sample)
{
return (sample >= 0) ? nir_imm_int(b, sample) : nir_load_sample_id(b);
}
static void
pan_lower_fb_load(nir_shader *shader,
nir_builder *b,
nir_intrinsic_instr *intr,
const struct util_format_description *desc,
bool reorder_comps,
unsigned base, int sample)
{
nir_ssa_def *packed =
nir_load_raw_output_pan(b, 4, 32, pan_sample_id(b, sample),
.base = base);
/* Convert the raw value */
nir_ssa_def *unpacked = pan_unpack(b, desc, packed);
/* Convert to the size of the load intrinsic.
*
* We can assume that the type will match with the framebuffer format:
*
* Page 170 of the PDF of the OpenGL ES 3.0.6 spec says:
*
* If [UNORM or SNORM, convert to fixed-point]; otherwise no type
* conversion is applied. If the values written by the fragment shader
* do not match the format(s) of the corresponding color buffer(s),
* the result is undefined.
*/
unsigned bits = nir_dest_bit_size(intr->dest);
nir_alu_type src_type = nir_alu_type_get_base_type(
pan_unpacked_type_for_format(desc));
unpacked = nir_convert_to_bit_size(b, unpacked, src_type, bits);
unpacked = nir_resize_vector(b, unpacked, intr->dest.ssa.num_components);
/* Reorder the components */
if (reorder_comps)
unpacked = pan_unpack_reorder(b, desc, unpacked);
nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, unpacked, &intr->instr);
}
bool
pan_lower_framebuffer(nir_shader *shader, const enum pipe_format *rt_fmts,
uint8_t raw_fmt_mask, bool is_blend, bool broken_ld_special)
{
if (shader->info.stage != MESA_SHADER_FRAGMENT)
return false;
bool progress = false;
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 && is_blend)))
continue;
nir_variable *var = nir_intrinsic_get_var(intr, 0);
if (var->data.mode != nir_var_shader_out)
continue;
if (var->data.location < FRAG_RESULT_DATA0)
continue;
unsigned base = var->data.driver_location;
unsigned rt = var->data.location - FRAG_RESULT_DATA0;
if (rt_fmts[rt] == PIPE_FORMAT_NONE)
continue;
const struct util_format_description *desc =
util_format_description(rt_fmts[rt]);
/* Don't lower */
if (pan_is_format_native(desc, broken_ld_special, is_store))
continue;
/* EXT_shader_framebuffer_fetch requires
* per-sample loads.
* MSAA blend shaders are not yet handled, so
* for now always load sample 0. */
int sample = is_blend ? 0 : -1;
bool reorder_comps = raw_fmt_mask & BITFIELD_BIT(rt);
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, reorder_comps);
} else {
b.cursor = nir_after_instr(instr);
pan_lower_fb_load(shader, &b, intr, desc, reorder_comps, base, sample);
}
nir_instr_remove(instr);
progress = true;
}
}
nir_metadata_preserve(func->impl, nir_metadata_block_index |
nir_metadata_dominance);
}
return progress;
}
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