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mesa/src/panfrost/util/pan_lower_framebuffer.c
Icecream95 9630012060 panfrost: RGBA4 and RGB5_A1 framebuffer support 
Tested with fbo_firecube.

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5573>
2020-06-22 12:15:05 +00:00

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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, 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"
#include "panfrost-quirks.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 bit8 = (desc->channel[c].size == 8);
assert(desc->channel[c].size <= 32);
if (desc->channel[c].normalized)
return large ? 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");
}
}
enum pan_format_class
pan_format_class_load(const struct util_format_description *desc, unsigned quirks)
{
/* Check if we can do anything better than software architecturally */
if (quirks & MIDGARD_NO_TYPED_BLEND_LOADS) {
return (quirks & NO_BLEND_PACKS)
? PAN_FORMAT_SOFTWARE : PAN_FORMAT_PACK;
}
/* Some formats are missing as typed on some GPUs but have unpacks */
if (quirks & MIDGARD_MISSING_LOADS) {
switch (desc->format) {
case PIPE_FORMAT_R11G11B10_FLOAT:
case PIPE_FORMAT_R10G10B10A2_UNORM:
case PIPE_FORMAT_B10G10R10A2_UNORM:
case PIPE_FORMAT_R10G10B10X2_UNORM:
case PIPE_FORMAT_B10G10R10X2_UNORM:
case PIPE_FORMAT_R10G10B10A2_UINT:
return PAN_FORMAT_PACK;
default:
return PAN_FORMAT_NATIVE;
}
}
/* Otherwise, we can do native */
return PAN_FORMAT_NATIVE;
}
enum pan_format_class
pan_format_class_store(const struct util_format_description *desc, unsigned quirks)
{
/* Check if we can do anything better than software architecturally */
if (quirks & MIDGARD_NO_TYPED_BLEND_STORES) {
return (quirks & NO_BLEND_PACKS)
? PAN_FORMAT_SOFTWARE : PAN_FORMAT_PACK;
}
return PAN_FORMAT_NATIVE;
}
/* Convenience method */
static enum pan_format_class
pan_format_class(const struct util_format_description *desc, unsigned quirks, bool is_store)
{
if (is_store)
return pan_format_class_store(desc, quirks);
else
return pan_format_class_load(desc, quirks);
}
/* 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.
*
* Pure 32 formats (R32F ... RGBA32F) are 32 unpacked, so just need to
* replicate to fill */
static nir_ssa_def *
pan_pack_pure_32(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *replicated[4];
for (unsigned i = 0; i < 4; ++i)
replicated[i] = nir_channel(b, v, i % v->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)
{
nir_ssa_def *replicated[4];
for (unsigned i = 0; i < 4; ++i) {
unsigned c = 2 * i;
nir_ssa_def *parts[2] = {
nir_channel(b, v, (c + 0) % v->num_components),
nir_channel(b, v, (c + 1) % v->num_components)
};
replicated[i] = nir_pack_32_2x16(b, nir_vec(b, parts, 2));
}
return nir_vec(b, replicated, 4);
}
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);
}
for (unsigned i = num_components; i < 4; ++i)
unpacked[i] = nir_imm_intN_t(b, 0, 16);
return nir_vec(b, unpacked, 4);
}
/* And likewise for x8. pan_fill_4 fills a 4-channel vector with a n-channel
* vector (n <= 4), replicating as needed. pan_replicate_4 constructs a
* 4-channel vector from a scalar via replication */
static nir_ssa_def *
pan_fill_4(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *q[4];
assert(v->num_components <= 4);
for (unsigned j = 0; j < 4; ++j)
q[j] = nir_channel(b, v, j % v->num_components);
return nir_vec(b, q, 4);
}
static nir_ssa_def *
pan_replicate_4(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *replicated[4] = { v, v, v, v };
return nir_vec(b, replicated, 4);
}
static nir_ssa_def *
pan_pack_pure_8(nir_builder *b, nir_ssa_def *v)
{
return pan_replicate_4(b, nir_pack_32_4x8(b, pan_fill_4(b, v)));
}
static nir_ssa_def *
pan_unpack_pure_8(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
assert(num_components <= 4);
nir_ssa_def *unpacked = nir_unpack_32_4x8(b, nir_channel(b, pack, 0));
return nir_channels(b, unpacked, (1 << num_components) - 1);
}
/* UNORM 8 is unpacked to f16 vec4. We could directly use the un/pack_unorm_4x8
* ops provided we replicate appropriately, but for packing we'd rather stay in
* 8/16-bit whereas the NIR op forces 32-bit, so we do it manually */
static nir_ssa_def *
pan_pack_unorm_8(nir_builder *b, nir_ssa_def *v)
{
return pan_replicate_4(b, nir_pack_32_4x8(b,
nir_f2u8(b, nir_fround_even(b, nir_fmul(b, nir_fsat(b,
pan_fill_4(b, v)), nir_imm_float16(b, 255.0))))));
}
static nir_ssa_def *
pan_unpack_unorm_8(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
assert(num_components <= 4);
nir_ssa_def *unpacked = nir_unpack_unorm_4x8(b, nir_channel(b, pack, 0));
return nir_f2f16(b, unpacked);
}
/* UNORM 4 is also unpacked to f16, which prevents us from using the shared
* unpack which strongly assumes fp32. However, on the tilebuffer it is actually packed as:
*
* [AAAA] [0000] [BBBB] [0000] [GGGG] [0000] [RRRR] [0000]
*
* In other words, spacing it out so we're aligned to bytes and on top. So
* pack as:
*
* pack_32_4x8(f2u8_rte(v * 15.0) << 4)
*/
static nir_ssa_def *
pan_pack_unorm_small(nir_builder *b, nir_ssa_def *v,
nir_ssa_def *scales, nir_ssa_def *shifts)
{
nir_ssa_def *f = nir_fmul(b, nir_fsat(b, pan_fill_4(b, v)), 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_unpack_unorm_small(nir_builder *b, nir_ssa_def *pack,
nir_ssa_def *scales, nir_ssa_def *shifts)
{
nir_ssa_def *channels = nir_unpack_32_4x8(b, nir_channel(b, pack, 0));
nir_ssa_def *raw = nir_ushr(b, nir_u2u16(b, channels), shifts);
return nir_fmul(b, nir_u2f16(b, raw), scales);
}
static nir_ssa_def *
pan_pack_unorm_4(nir_builder *b, nir_ssa_def *v)
{
return pan_pack_unorm_small(b, v,
nir_imm_vec4_16(b, 15.0, 15.0, 15.0, 15.0),
nir_imm_ivec4(b, 4, 4, 4, 4));
}
static nir_ssa_def *
pan_unpack_unorm_4(nir_builder *b, nir_ssa_def *v)
{
return pan_unpack_unorm_small(b, v,
nir_imm_vec4_16(b, 1.0 / 15.0, 1.0 / 15.0, 1.0 / 15.0, 1.0 / 15.0),
nir_imm_ivec4(b, 4, 4, 4, 4));
}
/* UNORM RGB5_A1 and RGB565 are similar */
static nir_ssa_def *
pan_pack_unorm_5551(nir_builder *b, nir_ssa_def *v)
{
return pan_pack_unorm_small(b, v,
nir_imm_vec4_16(b, 31.0, 31.0, 31.0, 1.0),
nir_imm_ivec4(b, 3, 3, 3, 7));
}
static nir_ssa_def *
pan_unpack_unorm_5551(nir_builder *b, nir_ssa_def *v)
{
return pan_unpack_unorm_small(b, v,
nir_imm_vec4_16(b, 1.0 / 31.0, 1.0 / 31.0, 1.0 / 31.0, 1.0),
nir_imm_ivec4(b, 3, 3, 3, 7));
}
static nir_ssa_def *
pan_pack_unorm_565(nir_builder *b, nir_ssa_def *v)
{
return pan_pack_unorm_small(b, v,
nir_imm_vec4_16(b, 31.0, 63.0, 31.0, 0.0),
nir_imm_ivec4(b, 3, 2, 3, 0));
}
static nir_ssa_def *
pan_unpack_unorm_565(nir_builder *b, nir_ssa_def *v)
{
return pan_unpack_unorm_small(b, v,
nir_imm_vec4_16(b, 1.0 / 31.0, 1.0 / 63.0, 1.0 / 31.0, 0.0),
nir_imm_ivec4(b, 3, 2, 3, 0));
}
/* 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_16(b, 1023.0, 1023.0, 1023.0, 3.0);
nir_ssa_def *s = nir_f2u32(b, nir_fround_even(b, nir_f2f32(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);
}
static nir_ssa_def *
pan_unpack_unorm_1010102(nir_builder *b, nir_ssa_def *packed)
{
nir_ssa_def *p = nir_channel(b, packed, 0);
nir_ssa_def *bytes = nir_unpack_32_4x8(b, p);
nir_ssa_def *ubytes = nir_u2u16(b, bytes);
nir_ssa_def *shifts = nir_ushr(b, pan_replicate_4(b, nir_channel(b, ubytes, 3)),
nir_imm_ivec4(b, 0, 2, 4, 6));
nir_ssa_def *precision = nir_iand(b, shifts,
nir_i2i16(b, nir_imm_ivec4(b, 0x3, 0x3, 0x3, 0x3)));
nir_ssa_def *top_rgb = nir_ishl(b, nir_channels(b, ubytes, 0x7), nir_imm_int(b, 2));
top_rgb = nir_ior(b, nir_channels(b, precision, 0x7), top_rgb);
nir_ssa_def *chans [4] = {
nir_channel(b, top_rgb, 0),
nir_channel(b, top_rgb, 1),
nir_channel(b, top_rgb, 2),
nir_channel(b, precision, 3)
};
nir_ssa_def *scale = nir_imm_vec4(b, 1.0 / 1023.0, 1.0 / 1023.0, 1.0 / 1023.0, 1.0 / 3.0);
return nir_f2f16(b, nir_fmul(b, nir_u2f32(b, nir_vec(b, chans, 4)), scale));
}
/* On the other hand, the pure int RGB10_A2 is identical to the spec */
static nir_ssa_def *
pan_pack_uint_1010102(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *shift = nir_ishl(b, nir_u2u32(b, v),
nir_imm_ivec4(b, 0, 10, 20, 30));
nir_ssa_def *p = nir_ior(b,
nir_ior(b, nir_channel(b, shift, 0), nir_channel(b, shift, 1)),
nir_ior(b, nir_channel(b, shift, 2), nir_channel(b, shift, 3)));
return pan_replicate_4(b, p);
}
static nir_ssa_def *
pan_unpack_uint_1010102(nir_builder *b, nir_ssa_def *packed)
{
nir_ssa_def *chan = nir_channel(b, packed, 0);
nir_ssa_def *shift = nir_ushr(b, pan_replicate_4(b, chan),
nir_imm_ivec4(b, 0, 10, 20, 30));
nir_ssa_def *mask = nir_iand(b, shift,
nir_imm_ivec4(b, 0x3ff, 0x3ff, 0x3ff, 0x3));
return nir_u2u16(b, mask);
}
/* 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_f2f16(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_f2f16(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);
}
static nir_ssa_def *
pan_srgb_to_linear(nir_builder *b, nir_ssa_def *srgb)
{
nir_ssa_def *rgb = nir_channels(b, srgb, 0x7);
/* TODO: fp16 native conversion */
nir_ssa_def *linear = nir_f2f16(b,
nir_format_srgb_to_linear(b, nir_f2f32(b, rgb)));
nir_ssa_def *comp[4] = {
nir_channel(b, linear, 0),
nir_channel(b, linear, 1),
nir_channel(b, linear, 2),
nir_channel(b, srgb, 3),
};
return nir_vec(b, comp, 4);
}
/* Generic dispatches for un/pack regardless of format */
static bool
pan_is_unorm4(const struct util_format_description *desc)
{
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 true;
default:
return false;
}
}
static nir_ssa_def *
pan_unpack(nir_builder *b,
const struct util_format_description *desc,
nir_ssa_def *packed)
{
if (util_format_is_unorm8(desc))
return pan_unpack_unorm_8(b, packed, desc->nr_channels);
if (pan_is_unorm4(desc))
return pan_unpack_unorm_4(b, 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_B5G5R5A1_UNORM:
case PIPE_FORMAT_R5G5B5A1_UNORM:
return pan_unpack_unorm_5551(b, packed);
case PIPE_FORMAT_B5G6R5_UNORM:
return pan_unpack_unorm_565(b, packed);
case PIPE_FORMAT_R10G10B10A2_UNORM:
return pan_unpack_unorm_1010102(b, packed);
case PIPE_FORMAT_R10G10B10A2_UINT:
return pan_unpack_uint_1010102(b, packed);
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_8(b, unpacked);
if (pan_is_unorm4(desc))
return pan_pack_unorm_4(b, unpacked);
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_pack_pure_32(b, unpacked) :
pan_pack_pure_16(b, unpacked);
} else if (d.size == 8) {
assert(d.pure_integer);
return pan_pack_pure_8(b, unpacked);
} else {
unreachable("Unrenderable size");
}
}
switch (desc->format) {
case PIPE_FORMAT_B5G5R5A1_UNORM:
case PIPE_FORMAT_R5G5B5A1_UNORM:
return pan_pack_unorm_5551(b, unpacked);
case PIPE_FORMAT_B5G6R5_UNORM:
return pan_pack_unorm_565(b, unpacked);
case PIPE_FORMAT_R10G10B10A2_UNORM:
return pan_pack_unorm_1010102(b, unpacked);
case PIPE_FORMAT_R10G10B10A2_UINT:
return pan_pack_uint_1010102(b, unpacked);
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,
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);
if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB)
unpacked = pan_srgb_to_linear(b, unpacked);
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;
enum pan_format_class fmt_class =
pan_format_class(desc, quirks, is_store);
/* Don't lower */
if (fmt_class == PAN_FORMAT_NATIVE)
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);
}
}
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