src/broadcom/compiler/v3d_nir_lower_image_load_store.c - platform/external/mesa3d - Git at Google

 /*
  * Copyright © 2018 Intel Corporation
  * Copyright © 2018 Broadcom
  *
  * 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.
  */

 #include "v3d_compiler.h"
 #include "compiler/nir/nir_builder.h"
 #include "compiler/nir/nir_format_convert.h"

 /** @file v3d_nir_lower_image_load_store.c
  *
  * Performs any necessary lowering of GL_ARB_shader_image_load_store
  * operations.
  *
  * On V3D 4.x, we just need to do format conversion for stores such that the
  * GPU can effectively memcpy the arguments (in increments of 32-bit words)
  * into the texel.  Loads are the same as texturing, where we may need to
  * unpack from 16-bit ints or floats.
  *
  * On V3D 3.x, to implement image load store we would need to do manual tiling
  * calculations and load/store using the TMU general memory access path.
  */

 bool
 v3d_gl_format_is_return_32(enum pipe_format format)
 {
         const struct util_format_description *desc =
                 util_format_description(format);
         const struct util_format_channel_description *chan = &desc->channel[0];

         return chan->size > 16 || (chan->size == 16 && chan->normalized);
 }

 /* Packs a 32-bit vector of colors in the range [0, (1 << bits[i]) - 1] to a
  * 32-bit SSA value, with as many channels as necessary to store all the bits
  */
 static nir_ssa_def *
 pack_bits(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
           int num_components, bool mask)
 {
         nir_ssa_def *results[4];
         int offset = 0;
         for (int i = 0; i < num_components; i++) {
                 nir_ssa_def *chan = nir_channel(b, color, i);

                 /* Channels being stored shouldn't cross a 32-bit boundary. */
                 assert((offset & ~31) == ((offset + bits[i] - 1) & ~31));

                 if (mask) {
                         chan = nir_iand(b, chan,
                                         nir_imm_int(b, (1 << bits[i]) - 1));
                 }

                 if (offset % 32 == 0) {
                         results[offset / 32] = chan;
                 } else {
                         results[offset / 32] =
                                 nir_ior(b, results[offset / 32],
                                         nir_ishl(b, chan,
                                                  nir_imm_int(b, offset % 32)));
                 }
                 offset += bits[i];
         }

         return nir_vec(b, results, DIV_ROUND_UP(offset, 32));
 }

 static void
 v3d_nir_lower_image_store(nir_builder *b, nir_intrinsic_instr *instr)
 {
         nir_variable *var = nir_intrinsic_get_var(instr, 0);
         enum pipe_format format = var->data.image.format;
         const struct util_format_description *desc =
                 util_format_description(format);
         const struct util_format_channel_description *r_chan = &desc->channel[0];
         unsigned num_components = util_format_get_nr_components(format);

         b->cursor = nir_before_instr(&instr->instr);

         nir_ssa_def *color = nir_channels(b,
                                           nir_ssa_for_src(b, instr->src[3], 4),
                                           (1 << num_components) - 1);
         nir_ssa_def *formatted = NULL;

         if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
                 formatted = nir_format_pack_11f11f10f(b, color);
         } else if (format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
                 formatted = nir_format_pack_r9g9b9e5(b, color);
         } else if (r_chan->size == 32) {
                 /* For 32-bit formats, we just have to move the vector
                  * across (possibly reducing the number of channels).
                  */
                 formatted = color;
         } else {
                 static const unsigned bits_8[4] = {8, 8, 8, 8};
                 static const unsigned bits_16[4] = {16, 16, 16, 16};
                 static const unsigned bits_1010102[4] = {10, 10, 10, 2};
                 const unsigned *bits;

                 switch (r_chan->size) {
                 case 8:
                         bits = bits_8;
                         break;
                 case 10:
                         bits = bits_1010102;
                         break;
                 case 16:
                         bits = bits_16;
                         break;
                 default:
                         unreachable("unrecognized bits");
                 }

                 bool pack_mask = false;
                 if (r_chan->pure_integer &&
                     r_chan->type == UTIL_FORMAT_TYPE_SIGNED) {
                         formatted = nir_format_clamp_sint(b, color, bits);
                         pack_mask = true;
                 } else if (r_chan->pure_integer &&
                            r_chan->type == UTIL_FORMAT_TYPE_UNSIGNED) {
                         formatted = nir_format_clamp_uint(b, color, bits);
                 } else if (r_chan->normalized &&
                            r_chan->type == UTIL_FORMAT_TYPE_SIGNED) {
                         formatted = nir_format_float_to_snorm(b, color, bits);
                         pack_mask = true;
                 } else if (r_chan->normalized &&
                            r_chan->type == UTIL_FORMAT_TYPE_UNSIGNED) {
                         formatted = nir_format_float_to_unorm(b, color, bits);
                 } else {
                         assert(r_chan->size == 16);
                         assert(r_chan->type == UTIL_FORMAT_TYPE_FLOAT);
                         formatted = nir_format_float_to_half(b, color);
                 }

                 formatted = pack_bits(b, formatted, bits, num_components,
                                       pack_mask);
         }

         nir_instr_rewrite_src(&instr->instr, &instr->src[3],
                               nir_src_for_ssa(formatted));
         instr->num_components = formatted->num_components;
 }

 static void
 v3d_nir_lower_image_load(nir_builder *b, nir_intrinsic_instr *instr)
 {
         static const unsigned bits16[] = {16, 16, 16, 16};
         nir_variable *var = nir_intrinsic_get_var(instr, 0);
         const struct glsl_type *sampler_type = glsl_without_array(var->type);
         enum glsl_base_type base_type =
                 glsl_get_sampler_result_type(sampler_type);

         if (v3d_gl_format_is_return_32(var->data.image.format))
                 return;

         b->cursor = nir_after_instr(&instr->instr);

         assert(instr->dest.is_ssa);
         nir_ssa_def *result = &instr->dest.ssa;
         if (base_type == GLSL_TYPE_FLOAT) {
             nir_ssa_def *rg = nir_channel(b, result, 0);
             nir_ssa_def *ba = nir_channel(b, result, 1);
             result = nir_vec4(b,
                               nir_unpack_half_2x16_split_x(b, rg),
                               nir_unpack_half_2x16_split_y(b, rg),
                               nir_unpack_half_2x16_split_x(b, ba),
                               nir_unpack_half_2x16_split_y(b, ba));
         } else if (base_type == GLSL_TYPE_INT) {
                 result = nir_format_unpack_sint(b, result, bits16, 4);
         } else {
                 assert(base_type == GLSL_TYPE_UINT);
                 result = nir_format_unpack_uint(b, result, bits16, 4);
         }

         nir_ssa_def_rewrite_uses_after(&instr->dest.ssa, nir_src_for_ssa(result),
                                        result->parent_instr);
 }

 void
 v3d_nir_lower_image_load_store(nir_shader *s)
 {
         nir_foreach_function(function, s) {
                 if (!function->impl)
                         continue;

                 nir_builder b;
                 nir_builder_init(&b, function->impl);

                 nir_foreach_block(block, function->impl) {
                         nir_foreach_instr_safe(instr, block) {
                                 if (instr->type != nir_instr_type_intrinsic)
                                         continue;

                                 nir_intrinsic_instr *intr =
                                         nir_instr_as_intrinsic(instr);

                                 switch (intr->intrinsic) {
                                 case nir_intrinsic_image_deref_load:
                                         v3d_nir_lower_image_load(&b, intr);
                                         break;
                                 case nir_intrinsic_image_deref_store:
                                         v3d_nir_lower_image_store(&b, intr);
                                         break;
                                 default:
                                         break;
                                 }
                         }
                 }

                 nir_metadata_preserve(function->impl,
                                       nir_metadata_block_index |
                                       nir_metadata_dominance);
         }
 }
	/*
	* Copyright © 2018 Intel Corporation
	* Copyright © 2018 Broadcom
	*
	* 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.
	*/

	#include "v3d_compiler.h"
	#include "compiler/nir/nir_builder.h"
	#include "compiler/nir/nir_format_convert.h"

	/** @file v3d_nir_lower_image_load_store.c
	*
	* Performs any necessary lowering of GL_ARB_shader_image_load_store
	* operations.
	*
	* On V3D 4.x, we just need to do format conversion for stores such that the
	* GPU can effectively memcpy the arguments (in increments of 32-bit words)
	* into the texel. Loads are the same as texturing, where we may need to
	* unpack from 16-bit ints or floats.
	*
	* On V3D 3.x, to implement image load store we would need to do manual tiling
	* calculations and load/store using the TMU general memory access path.
	*/

	bool
	v3d_gl_format_is_return_32(enum pipe_format format)
	{
	const struct util_format_description *desc =
	util_format_description(format);
	const struct util_format_channel_description *chan = &desc->channel[0];

	return chan->size > 16 \|\| (chan->size == 16 && chan->normalized);
	}

	/* Packs a 32-bit vector of colors in the range [0, (1 << bits[i]) - 1] to a
	* 32-bit SSA value, with as many channels as necessary to store all the bits
	*/
	static nir_ssa_def *
	pack_bits(nir_builder b, nir_ssa_def color, const unsigned *bits,
	int num_components, bool mask)
	{
	nir_ssa_def *results[4];
	int offset = 0;
	for (int i = 0; i < num_components; i++) {
	nir_ssa_def *chan = nir_channel(b, color, i);

	/* Channels being stored shouldn't cross a 32-bit boundary. */
	assert((offset & ~31) == ((offset + bits[i] - 1) & ~31));

	if (mask) {
	chan = nir_iand(b, chan,
	nir_imm_int(b, (1 << bits[i]) - 1));
	}

	if (offset % 32 == 0) {
	results[offset / 32] = chan;
	} else {
	results[offset / 32] =
	nir_ior(b, results[offset / 32],
	nir_ishl(b, chan,
	nir_imm_int(b, offset % 32)));
	}
	offset += bits[i];
	}

	return nir_vec(b, results, DIV_ROUND_UP(offset, 32));
	}

	static void
	v3d_nir_lower_image_store(nir_builder b, nir_intrinsic_instr instr)
	{
	nir_variable *var = nir_intrinsic_get_var(instr, 0);
	enum pipe_format format = var->data.image.format;
	const struct util_format_description *desc =
	util_format_description(format);
	const struct util_format_channel_description *r_chan = &desc->channel[0];
	unsigned num_components = util_format_get_nr_components(format);

	b->cursor = nir_before_instr(&instr->instr);

	nir_ssa_def *color = nir_channels(b,
	nir_ssa_for_src(b, instr->src[3], 4),
	(1 << num_components) - 1);
	nir_ssa_def *formatted = NULL;

	if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
	formatted = nir_format_pack_11f11f10f(b, color);
	} else if (format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
	formatted = nir_format_pack_r9g9b9e5(b, color);
	} else if (r_chan->size == 32) {
	/* For 32-bit formats, we just have to move the vector
	* across (possibly reducing the number of channels).
	*/
	formatted = color;
	} else {
	static const unsigned bits_8[4] = {8, 8, 8, 8};
	static const unsigned bits_16[4] = {16, 16, 16, 16};
	static const unsigned bits_1010102[4] = {10, 10, 10, 2};
	const unsigned *bits;

	switch (r_chan->size) {
	case 8:
	bits = bits_8;
	break;
	case 10:
	bits = bits_1010102;
	break;
	case 16:
	bits = bits_16;
	break;
	default:
	unreachable("unrecognized bits");
	}

	bool pack_mask = false;
	if (r_chan->pure_integer &&
	r_chan->type == UTIL_FORMAT_TYPE_SIGNED) {
	formatted = nir_format_clamp_sint(b, color, bits);
	pack_mask = true;
	} else if (r_chan->pure_integer &&
	r_chan->type == UTIL_FORMAT_TYPE_UNSIGNED) {
	formatted = nir_format_clamp_uint(b, color, bits);
	} else if (r_chan->normalized &&
	r_chan->type == UTIL_FORMAT_TYPE_SIGNED) {
	formatted = nir_format_float_to_snorm(b, color, bits);
	pack_mask = true;
	} else if (r_chan->normalized &&
	r_chan->type == UTIL_FORMAT_TYPE_UNSIGNED) {
	formatted = nir_format_float_to_unorm(b, color, bits);
	} else {
	assert(r_chan->size == 16);
	assert(r_chan->type == UTIL_FORMAT_TYPE_FLOAT);
	formatted = nir_format_float_to_half(b, color);
	}

	formatted = pack_bits(b, formatted, bits, num_components,
	pack_mask);
	}

	nir_instr_rewrite_src(&instr->instr, &instr->src[3],
	nir_src_for_ssa(formatted));
	instr->num_components = formatted->num_components;
	}

	static void
	v3d_nir_lower_image_load(nir_builder b, nir_intrinsic_instr instr)
	{
	static const unsigned bits16[] = {16, 16, 16, 16};
	nir_variable *var = nir_intrinsic_get_var(instr, 0);
	const struct glsl_type *sampler_type = glsl_without_array(var->type);
	enum glsl_base_type base_type =
	glsl_get_sampler_result_type(sampler_type);

	if (v3d_gl_format_is_return_32(var->data.image.format))
	return;

	b->cursor = nir_after_instr(&instr->instr);

	assert(instr->dest.is_ssa);
	nir_ssa_def *result = &instr->dest.ssa;
	if (base_type == GLSL_TYPE_FLOAT) {
	nir_ssa_def *rg = nir_channel(b, result, 0);
	nir_ssa_def *ba = nir_channel(b, result, 1);
	result = nir_vec4(b,
	nir_unpack_half_2x16_split_x(b, rg),
	nir_unpack_half_2x16_split_y(b, rg),
	nir_unpack_half_2x16_split_x(b, ba),
	nir_unpack_half_2x16_split_y(b, ba));
	} else if (base_type == GLSL_TYPE_INT) {
	result = nir_format_unpack_sint(b, result, bits16, 4);
	} else {
	assert(base_type == GLSL_TYPE_UINT);
	result = nir_format_unpack_uint(b, result, bits16, 4);
	}

	nir_ssa_def_rewrite_uses_after(&instr->dest.ssa, nir_src_for_ssa(result),
	result->parent_instr);
	}

	void
	v3d_nir_lower_image_load_store(nir_shader *s)
	{
	nir_foreach_function(function, s) {
	if (!function->impl)
	continue;

	nir_builder b;
	nir_builder_init(&b, function->impl);

	nir_foreach_block(block, function->impl) {
	nir_foreach_instr_safe(instr, block) {
	if (instr->type != nir_instr_type_intrinsic)
	continue;

	nir_intrinsic_instr *intr =
	nir_instr_as_intrinsic(instr);

	switch (intr->intrinsic) {
	case nir_intrinsic_image_deref_load:
	v3d_nir_lower_image_load(&b, intr);
	break;
	case nir_intrinsic_image_deref_store:
	v3d_nir_lower_image_store(&b, intr);
	break;
	default:
	break;
	}
	}
	}

	nir_metadata_preserve(function->impl,
	nir_metadata_block_index \|
	nir_metadata_dominance);
	}
	}