[Mesa-dev] [PATCH v3 10/12] anv: add nir lowering pass for ycrcb textures

Dylan Baker dylan at pnwbakers.com
Thu Oct 5 16:36:38 UTC 2017


Quoting Lionel Landwerlin (2017-10-04 10:34:55)
> This pass implements all the implicit conversions required by the
> VK_KHR_sampler_ycbcr_conversion specification.
> 
> It also inserts plane sources onto sampling instructions that we then
> let the pipeline layout pass deal with, when mapping things correctly
> to descriptors.
> 
> v2: Add new file to meson build (Lionel)
>     Use nir_frcp() rather than (1.0f / x) (Jason)
>     Reuse nir_tex_instr_dest_size() rather than handwritten one (Jason)
>     Return progress (Jason)
>     Account for array of samplers (Jason)
> 
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> ---
>  src/intel/Makefile.sources                       |   1 +
>  src/intel/vulkan/anv_nir.h                       |   3 +
>  src/intel/vulkan/anv_nir_apply_pipeline_layout.c |  61 ++-
>  src/intel/vulkan/anv_nir_lower_ycbcr_textures.c  | 469 +++++++++++++++++++++++
>  src/intel/vulkan/anv_pipeline.c                  |   2 +
>  src/intel/vulkan/anv_private.h                   |  16 +-
>  src/intel/vulkan/meson.build                     |   1 +
>  7 files changed, 547 insertions(+), 6 deletions(-)
>  create mode 100644 src/intel/vulkan/anv_nir_lower_ycbcr_textures.c
> 
> diff --git a/src/intel/Makefile.sources b/src/intel/Makefile.sources
> index bca7a132b26..9672dcc252d 100644
> --- a/src/intel/Makefile.sources
> +++ b/src/intel/Makefile.sources
> @@ -219,6 +219,7 @@ VULKAN_FILES := \
>         vulkan/anv_nir_lower_input_attachments.c \
>         vulkan/anv_nir_lower_multiview.c \
>         vulkan/anv_nir_lower_push_constants.c \
> +       vulkan/anv_nir_lower_ycbcr_textures.c \

This needs to be added to meson too in src/intel/vulkan/meson.build

>         vulkan/anv_pass.c \
>         vulkan/anv_pipeline.c \
>         vulkan/anv_pipeline_cache.c \
> diff --git a/src/intel/vulkan/anv_nir.h b/src/intel/vulkan/anv_nir.h
> index 5b450b45cdf..8ac0a119dac 100644
> --- a/src/intel/vulkan/anv_nir.h
> +++ b/src/intel/vulkan/anv_nir.h
> @@ -37,6 +37,9 @@ void anv_nir_lower_push_constants(nir_shader *shader);
>  
>  bool anv_nir_lower_multiview(nir_shader *shader, uint32_t view_mask);
>  
> +bool anv_nir_lower_ycbcr_textures(nir_shader *shader,
> +                                  struct anv_pipeline *pipeline);
> +
>  void anv_nir_apply_pipeline_layout(struct anv_pipeline *pipeline,
>                                     nir_shader *shader,
>                                     struct brw_stage_prog_data *prog_data,
> diff --git a/src/intel/vulkan/anv_nir_apply_pipeline_layout.c b/src/intel/vulkan/anv_nir_apply_pipeline_layout.c
> index 428cfdf42d1..28cbb98c563 100644
> --- a/src/intel/vulkan/anv_nir_apply_pipeline_layout.c
> +++ b/src/intel/vulkan/anv_nir_apply_pipeline_layout.c
> @@ -131,7 +131,7 @@ lower_res_index_intrinsic(nir_intrinsic_instr *intrin,
>  static void
>  lower_tex_deref(nir_tex_instr *tex, nir_deref_var *deref,
>                  unsigned *const_index, unsigned hw_binding_size,
> -                nir_tex_src_type src_type,
> +                nir_tex_src_type src_type, bool allow_indirect,
>                  struct apply_pipeline_layout_state *state)
>  {
>     nir_builder *b = &state->builder;
> @@ -141,6 +141,15 @@ lower_tex_deref(nir_tex_instr *tex, nir_deref_var *deref,
>        nir_deref_array *deref_array = nir_deref_as_array(deref->deref.child);
>  
>        if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
> +         /* From VK_KHR_sampler_ycbcr_conversion:
> +          *
> +          * If sampler Y’CBCR conversion is enabled, the combined image
> +          * sampler must be indexed only by constant integral expressions when
> +          * aggregated into arrays in shader code, irrespective of the
> +          * shaderSampledImageArrayDynamicIndexing feature.
> +          */
> +         assert(allow_indirect);
> +
>           nir_ssa_def *index =
>              nir_iadd(b, nir_imm_int(b, deref_array->base_offset),
>                          nir_ssa_for_src(b, deref_array->indirect, 1));
> @@ -186,6 +195,46 @@ cleanup_tex_deref(nir_tex_instr *tex, nir_deref_var *deref)
>     nir_instr_rewrite_src(&tex->instr, &deref_array->indirect, NIR_SRC_INIT);
>  }
>  
> +static bool
> +has_tex_src_plane(nir_tex_instr *tex)
> +{
> +   for (unsigned i = 0; i < tex->num_srcs; i++) {
> +      if (tex->src[i].src_type == nir_tex_src_plane)
> +         return true;
> +   }
> +
> +   return false;
> +}
> +
> +static uint32_t
> +extract_tex_src_plane(nir_tex_instr *tex)
> +{
> +   nir_tex_src *new_srcs = rzalloc_array(tex, nir_tex_src, tex->num_srcs - 1);
> +   unsigned plane = 0;
> +
> +   for (unsigned i = 0, w = 0; i < tex->num_srcs; i++) {
> +      if (tex->src[i].src_type == nir_tex_src_plane) {
> +         nir_const_value *const_plane =
> +            nir_src_as_const_value(tex->src[i].src);
> +
> +         /* Our color conversion lowering pass should only ever insert
> +          * constants. */
> +         assert(const_plane);
> +         plane = const_plane->u32[0];
> +      } else {
> +         new_srcs[w].src_type = tex->src[i].src_type;
> +         nir_instr_move_src(&tex->instr, &new_srcs[w].src, &tex->src[i].src);
> +         w++;
> +      }
> +   }
> +
> +   ralloc_free(tex->src);
> +   tex->src = new_srcs;
> +   tex->num_srcs--;
> +
> +   return plane;
> +}
> +
>  static void
>  lower_tex(nir_tex_instr *tex, struct apply_pipeline_layout_state *state)
>  {
> @@ -198,17 +247,21 @@ lower_tex(nir_tex_instr *tex, struct apply_pipeline_layout_state *state)
>     unsigned binding = tex->texture->var->data.binding;
>     unsigned hw_binding_size =
>        state->layout->set[set].layout->binding[binding].hw_binding_size;
> -   tex->texture_index = state->set[set].surface_offsets[binding];
> +   bool has_plane = has_tex_src_plane(tex);
> +   unsigned plane = has_plane ? extract_tex_src_plane(tex) : 0;
> +
> +   tex->texture_index = state->set[set].surface_offsets[binding] + plane;
>     lower_tex_deref(tex, tex->texture, &tex->texture_index, hw_binding_size,
> -                   nir_tex_src_texture_offset, state);
> +                   nir_tex_src_texture_offset, !has_plane, state);
>  
>     if (tex->sampler) {
>        unsigned set = tex->sampler->var->data.descriptor_set;
>        unsigned binding = tex->sampler->var->data.binding;
>        unsigned hw_binding_size =
>           state->layout->set[set].layout->binding[binding].hw_binding_size;
> +      tex->sampler_index = state->set[set].sampler_offsets[binding] + plane;
>        lower_tex_deref(tex, tex->sampler, &tex->sampler_index, hw_binding_size,
> -                      nir_tex_src_sampler_offset, state);
> +                      nir_tex_src_sampler_offset, !has_plane, state);
>     }
>  
>     /* The backend only ever uses this to mark used surfaces.  We don't care
> diff --git a/src/intel/vulkan/anv_nir_lower_ycbcr_textures.c b/src/intel/vulkan/anv_nir_lower_ycbcr_textures.c
> new file mode 100644
> index 00000000000..d2253db9053
> --- /dev/null
> +++ b/src/intel/vulkan/anv_nir_lower_ycbcr_textures.c
> @@ -0,0 +1,469 @@
> +/*
> + * Copyright © 2017 Intel Corporation
> + *
> + * 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 "anv_nir.h"
> +#include "anv_private.h"
> +#include "nir.h"
> +#include "nir/nir_builder.h"
> +
> +struct ycbcr_state {
> +   nir_builder *builder;
> +   nir_ssa_def *image_size;
> +   nir_tex_instr *origin_tex;
> +   struct anv_ycbcr_conversion *conversion;
> +};
> +
> +static nir_ssa_def *
> +y_range(nir_builder *b,
> +        nir_ssa_def *y_channel,
> +        int bpc,
> +        VkSamplerYcbcrRangeKHR range)
> +{
> +   switch (range) {
> +   case VK_SAMPLER_YCBCR_RANGE_ITU_FULL_KHR:
> +      return y_channel;
> +   case VK_SAMPLER_YCBCR_RANGE_ITU_NARROW_KHR:
> +      return nir_fmul(b,
> +                      nir_fadd(b,
> +                               nir_fmul(b, y_channel,
> +                                        nir_imm_float(b, pow(2, bpc) - 1)),
> +                               nir_imm_float(b, -16.0f * pow(2, bpc - 8))),
> +                      nir_frcp(b, nir_imm_float(b, 219.0f * pow(2, bpc - 8))));
> +   default:
> +      unreachable("missing Ycbcr range");
> +      return NULL;
> +   }
> +}
> +
> +static nir_ssa_def *
> +chroma_range(nir_builder *b,
> +             nir_ssa_def *chroma_channel,
> +             int bpc,
> +             VkSamplerYcbcrRangeKHR range)
> +{
> +   switch (range) {
> +   case VK_SAMPLER_YCBCR_RANGE_ITU_FULL_KHR:
> +      return nir_fadd(b, chroma_channel,
> +                      nir_imm_float(b, -pow(2, bpc - 1) / (pow(2, bpc) - 1.0f)));
> +   case VK_SAMPLER_YCBCR_RANGE_ITU_NARROW_KHR:
> +      return nir_fmul(b,
> +                      nir_fadd(b,
> +                               nir_fmul(b, chroma_channel,
> +                                        nir_imm_float(b, pow(2, bpc) - 1)),
> +                               nir_imm_float(b, -128.0f * pow(2, bpc - 8))),
> +                      nir_frcp(b, nir_imm_float(b, 224.0f * pow(2, bpc - 8))));
> +   default:
> +      unreachable("missing Ycbcr range");
> +      return NULL;
> +   }
> +}
> +
> +static const nir_const_value *
> +ycbcr_model_to_rgb_matrix(VkSamplerYcbcrModelConversionKHR model)
> +{
> +   switch (model) {
> +   case VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601_KHR: {
> +      static const nir_const_value bt601[3] = {
> +         { .f32 = {  1.402f,             1.0f,  0.0f,               0.0f } },
> +         { .f32 = { -0.714136286201022f, 1.0f, -0.344136286201022f, 0.0f } },
> +         { .f32 = {  0.0f,               1.0f,  1.772f,             0.0f } }
> +      };
> +
> +      return bt601;
> +   }
> +   case VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709_KHR: {
> +      static const nir_const_value bt709[3] = {
> +         { .f32 = {  1.5748031496063f,   1.0f,  0.0,                0.0f } },
> +         { .f32 = { -0.468125209181067f, 1.0f, -0.187327487470334f, 0.0f } },
> +         { .f32 = {  0.0f,               1.0f,  1.85563184264242f,  0.0f } }
> +      };
> +
> +      return bt709;
> +   }
> +   case VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020_KHR: {
> +      static const nir_const_value bt2020[3] = {
> +         { .f32 = { 1.4746f,             1.0f,  0.0f,               0.0f } },
> +         { .f32 = { -0.571353126843658f, 1.0f, -0.164553126843658f, 0.0f } },
> +         { .f32 = { 0.0f,                1.0f,  1.8814f,            0.0f } }
> +      };
> +
> +      return bt2020;
> +   }
> +   default:
> +      unreachable("missing Ycbcr model");
> +      return NULL;
> +   }
> +}
> +
> +static nir_ssa_def *
> +convert_ycbcr(struct ycbcr_state *state,
> +              nir_ssa_def *raw_channels,
> +              uint32_t *bpcs)
> +{
> +   nir_builder *b = state->builder;
> +   struct anv_ycbcr_conversion *conversion = state->conversion;
> +
> +   nir_ssa_def *expanded_channels =
> +      nir_vec4(b,
> +               chroma_range(b, nir_channel(b, raw_channels, 0),
> +                            bpcs[0], conversion->ycbcr_range),
> +               y_range(b, nir_channel(b, raw_channels, 1),
> +                       bpcs[1], conversion->ycbcr_range),
> +               chroma_range(b, nir_channel(b, raw_channels, 2),
> +                            bpcs[2], conversion->ycbcr_range),
> +               nir_imm_float(b, 1.0f));
> +
> +   if (conversion->ycbcr_model == VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_IDENTITY_KHR)
> +      return expanded_channels;
> +
> +   const nir_const_value *conversion_matrix =
> +      ycbcr_model_to_rgb_matrix(conversion->ycbcr_model);
> +
> +   nir_ssa_def *converted_channels[] = {
> +      nir_fdot4(b, expanded_channels, nir_build_imm(b, 4, 32, conversion_matrix[0])),
> +      nir_fdot4(b, expanded_channels, nir_build_imm(b, 4, 32, conversion_matrix[1])),
> +      nir_fdot4(b, expanded_channels, nir_build_imm(b, 4, 32, conversion_matrix[2]))
> +   };
> +
> +   return nir_vec4(b,
> +                   converted_channels[0], converted_channels[1],
> +                   converted_channels[2], nir_imm_float(b, 1.0f));
> +}
> +
> +/* TODO: we should probably replace this with a push constant/uniform. */
> +static nir_ssa_def *
> +get_texture_size(struct ycbcr_state *state, nir_deref_var *texture)
> +{
> +   if (state->image_size)
> +      return state->image_size;
> +
> +   nir_builder *b = state->builder;
> +   const struct glsl_type *type = nir_deref_tail(&texture->deref)->type;
> +   nir_tex_instr *tex = nir_tex_instr_create(b->shader, 0);
> +
> +   tex->op = nir_texop_txs;
> +   tex->sampler_dim = glsl_get_sampler_dim(type);
> +   tex->is_array = glsl_sampler_type_is_array(type);
> +   tex->is_shadow = glsl_sampler_type_is_shadow(type);
> +   tex->texture = nir_deref_var_clone(texture, tex);
> +   tex->dest_type = nir_type_int;
> +
> +   nir_ssa_dest_init(&tex->instr, &tex->dest,
> +                     nir_tex_instr_dest_size(tex), 32, NULL);
> +   nir_builder_instr_insert(b, &tex->instr);
> +
> +   state->image_size = nir_i2f32(b, &tex->dest.ssa);
> +
> +   return state->image_size;
> +}
> +
> +static nir_ssa_def *
> +implicit_downsampled_coord(nir_builder *b,
> +                           nir_ssa_def *value,
> +                           nir_ssa_def *max_value,
> +                           int div_scale)
> +{
> +   return nir_fadd(b,
> +                   value,
> +                   nir_fdiv(b,
> +                            nir_imm_float(b, 1.0f),
> +                            nir_fmul(b,
> +                                     nir_imm_float(b, div_scale),
> +                                     max_value)));
> +}
> +
> +static nir_ssa_def *
> +implicit_downsampled_coords(struct ycbcr_state *state,
> +                            nir_ssa_def *old_coords,
> +                            const struct anv_format_plane *plane_format)
> +{
> +   nir_builder *b = state->builder;
> +   struct anv_ycbcr_conversion *conversion = state->conversion;
> +   nir_ssa_def *image_size = get_texture_size(state,
> +                                              state->origin_tex->texture);
> +   nir_ssa_def *comp[4] = { NULL, };
> +   int c;
> +
> +   for (c = 0; c < ARRAY_SIZE(conversion->chroma_offsets); c++) {
> +      if (plane_format->denominator_scales[c] > 1 &&
> +          conversion->chroma_offsets[c] == VK_CHROMA_LOCATION_COSITED_EVEN_KHR) {
> +         comp[c] = implicit_downsampled_coord(b,
> +                                              nir_channel(b, old_coords, c),
> +                                              nir_channel(b, image_size, c),
> +                                              plane_format->denominator_scales[c]);
> +      } else {
> +         comp[c] = nir_channel(b, old_coords, c);
> +      }
> +   }
> +
> +   /* Leave other coordinates untouched */
> +   for (; c < old_coords->num_components; c++)
> +      comp[c] = nir_channel(b, old_coords, c);
> +
> +   return nir_vec(b, comp, old_coords->num_components);
> +}
> +
> +static nir_ssa_def *
> +create_plane_tex_instr_implicit(struct ycbcr_state *state,
> +                                uint32_t plane)
> +{
> +   nir_builder *b = state->builder;
> +   struct anv_ycbcr_conversion *conversion = state->conversion;
> +   const struct anv_format_plane *plane_format =
> +      &conversion->format->planes[plane];
> +   nir_tex_instr *old_tex = state->origin_tex;
> +   nir_tex_instr *tex = nir_tex_instr_create(b->shader, old_tex->num_srcs + 1);
> +
> +   for (uint32_t i = 0; i < old_tex->num_srcs; i++) {
> +      tex->src[i].src_type = old_tex->src[i].src_type;
> +
> +      switch (old_tex->src[i].src_type) {
> +      case nir_tex_src_coord:
> +         if (plane_format->has_chroma && conversion->chroma_reconstruction) {
> +            assert(old_tex->src[i].src.is_ssa);
> +            tex->src[i].src =
> +               nir_src_for_ssa(implicit_downsampled_coords(state,
> +                                                           old_tex->src[i].src.ssa,
> +                                                           plane_format));
> +            break;
> +         }
> +         /* fall through */
> +      default:
> +         nir_src_copy(&tex->src[i].src, &old_tex->src[i].src, tex);
> +         break;
> +      }
> +   }
> +   tex->src[tex->num_srcs - 1].src = nir_src_for_ssa(nir_imm_int(b, plane));
> +   tex->src[tex->num_srcs - 1].src_type = nir_tex_src_plane;
> +
> +   tex->sampler_dim = old_tex->sampler_dim;
> +   tex->dest_type = old_tex->dest_type;
> +
> +   tex->op = old_tex->op;
> +   tex->coord_components = old_tex->coord_components;
> +   tex->is_new_style_shadow = old_tex->is_new_style_shadow;
> +   tex->component = old_tex->component;
> +
> +   tex->texture_index = old_tex->texture_index;
> +   tex->texture_array_size = old_tex->texture_array_size;
> +   tex->texture = nir_deref_var_clone(old_tex->texture, tex);
> +
> +   tex->sampler_index = old_tex->sampler_index;
> +   tex->sampler = nir_deref_var_clone(old_tex->sampler, tex);
> +
> +   nir_ssa_dest_init(&tex->instr, &tex->dest,
> +                     old_tex->dest.ssa.num_components,
> +                     nir_dest_bit_size(old_tex->dest), NULL);
> +   nir_builder_instr_insert(b, &tex->instr);
> +
> +   return &tex->dest.ssa;
> +}
> +
> +static unsigned
> +channel_to_component(enum isl_channel_select channel)
> +{
> +   switch (channel) {
> +   case ISL_CHANNEL_SELECT_RED:
> +      return 0;
> +   case ISL_CHANNEL_SELECT_GREEN:
> +      return 1;
> +   case ISL_CHANNEL_SELECT_BLUE:
> +      return 2;
> +   case ISL_CHANNEL_SELECT_ALPHA:
> +      return 3;
> +   default:
> +      unreachable("invalid channel");
> +      return 0;
> +   }
> +}
> +
> +static enum isl_channel_select
> +swizzle_channel(struct isl_swizzle swizzle, unsigned channel)
> +{
> +   switch (channel) {
> +   case 0:
> +      return swizzle.r;
> +   case 1:
> +      return swizzle.g;
> +   case 2:
> +      return swizzle.b;
> +   case 3:
> +      return swizzle.a;
> +   default:
> +      unreachable("invalid channel");
> +      return 0;
> +   }
> +}
> +
> +static void
> +try_lower_tex_ycbcr(struct anv_pipeline *pipeline,
> +                    nir_builder *builder,
> +                    nir_tex_instr *tex)
> +{
> +   nir_variable *var = tex->texture->var;
> +   const struct anv_descriptor_set_layout *set_layout =
> +      pipeline->layout->set[var->data.descriptor_set].layout;
> +   const struct anv_descriptor_set_binding_layout *binding =
> +      &set_layout->binding[var->data.binding];
> +
> +   if (tex->op == nir_texop_txs ||
> +       tex->op == nir_texop_query_levels ||
> +       tex->op == nir_texop_lod)
> +      return;
> +
> +   if (binding->immutable_samplers == NULL)
> +      return;
> +
> +   unsigned texture_index = tex->texture_index;
> +   if (tex->texture->deref.child) {
> +      assert(tex->texture->deref.child->deref_type == nir_deref_type_array);
> +      nir_deref_array *deref_array = nir_deref_as_array(tex->texture->deref.child);
> +      assert(deref_array->deref_array_type == nir_deref_array_type_direct);
> +      texture_index += MIN2(deref_array->base_offset, binding->hw_binding_size - 1);
> +   }
> +   const struct anv_sampler *sampler =
> +      binding->immutable_samplers[texture_index];
> +
> +   if (sampler->conversion == NULL)
> +      return;
> +
> +   struct ycbcr_state state = {
> +      .builder = builder,
> +      .origin_tex = tex,
> +      .conversion = sampler->conversion,
> +   };
> +
> +   builder->cursor = nir_before_instr(&tex->instr);
> +
> +   const struct anv_format *format = state.conversion->format;
> +   const struct isl_format_layout *y_isl_layout = NULL;
> +   for (uint32_t p = 0; p < format->n_planes; p++) {
> +      if (!format->planes[p].has_chroma)
> +         y_isl_layout = isl_format_get_layout(format->planes[p].isl_format);
> +   }
> +   assert(y_isl_layout != NULL);
> +   uint8_t y_bpc = y_isl_layout->channels_array[0].bits;
> +
> +   /* |ycbcr_comp| holds components in the order : Cr-Y-Cb */
> +   nir_ssa_def *ycbcr_comp[5] = { NULL, NULL, NULL,
> +                                  /* Use extra 2 channels for following swizzle */
> +                                  nir_imm_float(builder, 1.0f),
> +                                  nir_imm_float(builder, 0.0f),
> +   };
> +   uint8_t ycbcr_bpcs[5];
> +   memset(ycbcr_bpcs, y_bpc, sizeof(ycbcr_bpcs));
> +
> +   /* Go through all the planes and gather the samples into a |ycbcr_comp|
> +    * while applying a swizzle required by the spec:
> +    *
> +    *    R, G, B should respectively map to Cr, Y, Cb
> +    */
> +   for (uint32_t p = 0; p < format->n_planes; p++) {
> +      const struct anv_format_plane *plane_format = &format->planes[p];
> +      nir_ssa_def *plane_sample = create_plane_tex_instr_implicit(&state, p);
> +
> +      for (uint32_t pc = 0; pc < 4; pc++) {
> +         enum isl_channel_select ycbcr_swizzle =
> +            swizzle_channel(plane_format->ycbcr_swizzle, pc);
> +         if (ycbcr_swizzle == ISL_CHANNEL_SELECT_ZERO)
> +            continue;
> +
> +         unsigned ycbcr_component = channel_to_component(ycbcr_swizzle);
> +         ycbcr_comp[ycbcr_component] = nir_channel(builder, plane_sample, pc);
> +
> +         /* Also compute the number of bits for each component. */
> +         const struct isl_format_layout *isl_layout =
> +            isl_format_get_layout(plane_format->isl_format);
> +         ycbcr_bpcs[ycbcr_component] = isl_layout->channels_array[pc].bits;
> +      }
> +   }
> +
> +   /* Now remaps components to the order specified by the conversion. */
> +   nir_ssa_def *swizzled_comp[4] = { NULL, };
> +   uint32_t swizzled_bpcs[4] = { 0, };
> +
> +   for (uint32_t i = 0; i < ARRAY_SIZE(state.conversion->mapping); i++) {
> +      /* Maps to components in |ycbcr_comp| */
> +      static const uint32_t swizzle_mapping[] = {
> +         [VK_COMPONENT_SWIZZLE_ZERO] = 4,
> +         [VK_COMPONENT_SWIZZLE_ONE]  = 3,
> +         [VK_COMPONENT_SWIZZLE_R]    = 0,
> +         [VK_COMPONENT_SWIZZLE_G]    = 1,
> +         [VK_COMPONENT_SWIZZLE_B]    = 2,
> +         [VK_COMPONENT_SWIZZLE_A]    = 3,
> +      };
> +      const VkComponentSwizzle m = state.conversion->mapping[i];
> +
> +      if (m == VK_COMPONENT_SWIZZLE_IDENTITY) {
> +         swizzled_comp[i] = ycbcr_comp[i];
> +         swizzled_bpcs[i] = ycbcr_bpcs[i];
> +      } else {
> +         swizzled_comp[i] = ycbcr_comp[swizzle_mapping[m]];
> +         swizzled_bpcs[i] = ycbcr_bpcs[swizzle_mapping[m]];
> +      }
> +   }
> +
> +   nir_ssa_def *result = nir_vec(builder, swizzled_comp, 4);
> +   if (state.conversion->ycbcr_model != VK_SAMPLER_YCBCR_MODEL_CONVERSION_RGB_IDENTITY_KHR)
> +      result = convert_ycbcr(&state, result, swizzled_bpcs);
> +
> +   nir_ssa_def_rewrite_uses(&tex->dest.ssa, nir_src_for_ssa(result));
> +   nir_instr_remove(&tex->instr);
> +}
> +
> +bool
> +anv_nir_lower_ycbcr_textures(nir_shader *shader, struct anv_pipeline *pipeline)
> +{
> +   bool progress = false;
> +
> +   nir_foreach_function(function, shader) {
> +      if (!function->impl)
> +         continue;
> +
> +      bool function_progress = false;
> +      nir_builder builder;
> +      nir_builder_init(&builder, function->impl);
> +
> +      nir_foreach_block(block, function->impl) {
> +         nir_foreach_instr_safe(instr, block) {
> +            if (instr->type != nir_instr_type_tex)
> +               continue;
> +
> +            nir_tex_instr *tex = nir_instr_as_tex(instr);
> +            try_lower_tex_ycbcr(pipeline, &builder, tex);
> +
> +            function_progress = true;
> +         }
> +      }
> +
> +      if (function_progress) {
> +         nir_metadata_preserve(function->impl,
> +                               nir_metadata_block_index |
> +                               nir_metadata_dominance);
> +      }
> +
> +      progress |= function_progress;
> +   }
> +
> +   return progress;
> +}
> diff --git a/src/intel/vulkan/anv_pipeline.c b/src/intel/vulkan/anv_pipeline.c
> index 94e99d8437a..b35bad10503 100644
> --- a/src/intel/vulkan/anv_pipeline.c
> +++ b/src/intel/vulkan/anv_pipeline.c
> @@ -376,6 +376,8 @@ anv_pipeline_compile(struct anv_pipeline *pipeline,
>     if (nir == NULL)
>        return NULL;
>  
> +   NIR_PASS_V(nir, anv_nir_lower_ycbcr_textures, pipeline);
> +
>     NIR_PASS_V(nir, anv_nir_lower_push_constants);
>  
>     if (stage != MESA_SHADER_COMPUTE)
> diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
> index 2b3b5a1810a..1292084fed9 100644
> --- a/src/intel/vulkan/anv_private.h
> +++ b/src/intel/vulkan/anv_private.h
> @@ -2560,9 +2560,21 @@ void anv_fill_buffer_surface_state(struct anv_device *device,
>                                     uint32_t offset, uint32_t range,
>                                     uint32_t stride);
>  
> +
> +struct anv_ycbcr_conversion {
> +   const struct anv_format *        format;
> +   VkSamplerYcbcrModelConversionKHR ycbcr_model;
> +   VkSamplerYcbcrRangeKHR           ycbcr_range;
> +   VkComponentSwizzle               mapping[4];
> +   VkChromaLocationKHR              chroma_offsets[2];
> +   VkFilter                         chroma_filter;
> +   bool                             chroma_reconstruction;
> +};
> +
>  struct anv_sampler {
> -   uint32_t state[3][4];
> -   uint32_t n_planes;
> +   uint32_t                     state[3][4];
> +   uint32_t                     n_planes;
> +   struct anv_ycbcr_conversion *conversion;
>  };
>  
>  struct anv_framebuffer {
> diff --git a/src/intel/vulkan/meson.build b/src/intel/vulkan/meson.build
> index 6ce092e05ce..ff24e304ef5 100644
> --- a/src/intel/vulkan/meson.build
> +++ b/src/intel/vulkan/meson.build
> @@ -101,6 +101,7 @@ libanv_files = files(
>    'anv_nir_lower_input_attachments.c',
>    'anv_nir_lower_multiview.c',
>    'anv_nir_lower_push_constants.c',
> +  'anv_nir_lower_ycbcr_textures.c',
>    'anv_pass.c',
>    'anv_pipeline.c',
>    'anv_pipeline_cache.c',
> -- 
> 2.14.2
> 
> _______________________________________________
> mesa-dev mailing list
> mesa-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/mesa-dev
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