path: root/source/blender/draw/engines/workbench/workbench_materials.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Copyright 2018, Blender Foundation.
 */

/** \file
 * \ingroup draw_engine
 */

#include "workbench_private.h"

#include "BLI_memblock.h"

#include "BKE_image.h"
#include "BKE_node.h"

#include "BLI_dynstr.h"
#include "BLI_hash.h"

#include "DNA_node_types.h"
#include "DNA_mesh_types.h"

#include "GPU_uniformbuffer.h"

#include "ED_uvedit.h"

#define HSV_SATURATION 0.5
#define HSV_VALUE 0.8

void workbench_material_update_data(WORKBENCH_PrivateData *wpd,
                                    Object *ob,
                                    Material *mat,
                                    WORKBENCH_MaterialData *data,
                                    int color_type)
{
  data->metallic = 0.0f;
  data->roughness = 0.632455532f; /* sqrtf(0.4f); */
  data->alpha = wpd->shading.xray_alpha;

  if (color_type == V3D_SHADING_SINGLE_COLOR) {
    copy_v3_v3(data->base_color, wpd->shading.single_color);
  }
  else if (color_type == V3D_SHADING_RANDOM_COLOR) {
    uint hash = BLI_ghashutil_strhash_p_murmur(ob->id.name);
    if (ob->id.lib) {
      hash = (hash * 13) ^ BLI_ghashutil_strhash_p_murmur(ob->id.lib->name);
    }

    float hue = BLI_hash_int_01(hash);
    float hsv[3] = {hue, HSV_SATURATION, HSV_VALUE};
    hsv_to_rgb_v(hsv, data->base_color);
  }
  else if (ELEM(color_type, V3D_SHADING_OBJECT_COLOR, V3D_SHADING_VERTEX_COLOR)) {
    data->alpha *= ob->color[3];
    copy_v3_v3(data->base_color, ob->color);
  }
  else {
    /* V3D_SHADING_MATERIAL_COLOR or V3D_SHADING_TEXTURE_COLOR */
    if (mat) {
      data->alpha *= mat->a;
      copy_v3_v3(data->base_color, &mat->r);
      if (workbench_is_specular_highlight_enabled(wpd)) {
        data->metallic = mat->metallic;
        data->roughness = sqrtf(mat->roughness); /* Remap to disney roughness. */
      }
    }
    else {
      copy_v3_fl(data->base_color, 0.8f);
    }
  }
}

void workbench_material_ubo_data(WORKBENCH_PrivateData *wpd,
                                 Object *ob,
                                 Material *mat,
                                 WORKBENCH_UBO_Material *data,
                                 int color_type)
{
  float metallic = 0.0f;
  float roughness = 0.632455532f; /* sqrtf(0.4f); */
  float alpha = wpd->shading.xray_alpha;

  switch (color_type) {
    case V3D_SHADING_SINGLE_COLOR:
      copy_v3_v3(data->base_color, wpd->shading.single_color);
      break;
    case V3D_SHADING_RANDOM_COLOR: {
      uint hash = BLI_ghashutil_strhash_p_murmur(ob->id.name);
      if (ob->id.lib) {
        hash = (hash * 13) ^ BLI_ghashutil_strhash_p_murmur(ob->id.lib->name);
      }
      float hue = BLI_hash_int_01(hash);
      float hsv[3] = {hue, HSV_SATURATION, HSV_VALUE};
      hsv_to_rgb_v(hsv, data->base_color);
      break;
    }
    case V3D_SHADING_OBJECT_COLOR:
    case V3D_SHADING_VERTEX_COLOR:
      alpha *= ob->color[3];
      copy_v3_v3(data->base_color, ob->color);
      break;
    case V3D_SHADING_MATERIAL_COLOR:
    case V3D_SHADING_TEXTURE_COLOR:
    default:
      if (mat) {
        alpha *= mat->a;
        copy_v3_v3(data->base_color, &mat->r);
        metallic = mat->metallic;
        roughness = sqrtf(mat->roughness); /* Remap to disney roughness. */
      }
      else {
        copy_v3_fl(data->base_color, 0.8f);
      }
      break;
  }

  uint32_t packed_metallic = unit_float_to_uchar_clamp(metallic);
  uint32_t packed_roughness = unit_float_to_uchar_clamp(roughness);
  uint32_t packed_alpha = unit_float_to_uchar_clamp(alpha);
  data->packed_data = (packed_alpha << 16u) | (packed_roughness << 8u) | packed_metallic;
}

char *workbench_material_build_defines(WORKBENCH_PrivateData *wpd,
                                       bool is_uniform_color,
                                       bool is_hair,
                                       bool is_tiled,
                                       const WORKBENCH_ColorOverride color_override)
{
  char *str = NULL;
  bool use_textures = (wpd->shading.color_type == V3D_SHADING_TEXTURE_COLOR) && !is_uniform_color;
  bool use_vertex_colors = (wpd->shading.color_type == V3D_SHADING_VERTEX_COLOR) &&
                           !is_uniform_color;

  switch (color_override) {
    case WORKBENCH_COLOR_OVERRIDE_TEXTURE:
      use_textures = true;
      use_vertex_colors = false;
      is_hair = false;
      break;
    case WORKBENCH_COLOR_OVERRIDE_VERTEX:
      use_textures = false;
      use_vertex_colors = true;
      is_hair = false;
      is_tiled = false;
      break;
    case WORKBENCH_COLOR_OVERRIDE_OFF:
      break;
  }

  DynStr *ds = BLI_dynstr_new();

  if (wpd->shading.flag & V3D_SHADING_OBJECT_OUTLINE) {
    BLI_dynstr_append(ds, "#define V3D_SHADING_OBJECT_OUTLINE\n");
  }
  if (wpd->shading.flag & V3D_SHADING_SHADOW) {
    BLI_dynstr_append(ds, "#define V3D_SHADING_SHADOW\n");
  }
  if (SSAO_ENABLED(wpd) || CURVATURE_ENABLED(wpd)) {
    BLI_dynstr_append(ds, "#define WB_CAVITY\n");
  }
  if (workbench_is_specular_highlight_enabled(wpd)) {
    BLI_dynstr_append(ds, "#define V3D_SHADING_SPECULAR_HIGHLIGHT\n");
  }
  if (STUDIOLIGHT_ENABLED(wpd)) {
    BLI_dynstr_append(ds, "#define V3D_LIGHTING_STUDIO\n");
  }
  if (FLAT_ENABLED(wpd)) {
    BLI_dynstr_append(ds, "#define V3D_LIGHTING_FLAT\n");
  }
  if (MATCAP_ENABLED(wpd)) {
    BLI_dynstr_append(ds, "#define V3D_LIGHTING_MATCAP\n");
  }
  if (OBJECT_ID_PASS_ENABLED(wpd)) {
    BLI_dynstr_append(ds, "#define OBJECT_ID_PASS_ENABLED\n");
  }
  if (workbench_is_matdata_pass_enabled(wpd)) {
    BLI_dynstr_append(ds, "#define MATDATA_PASS_ENABLED\n");
  }
  if (NORMAL_VIEWPORT_PASS_ENABLED(wpd)) {
    BLI_dynstr_append(ds, "#define NORMAL_VIEWPORT_PASS_ENABLED\n");
  }
  if (use_vertex_colors) {
    BLI_dynstr_append(ds, "#define V3D_SHADING_VERTEX_COLOR\n");
  }
  if (use_textures) {
    BLI_dynstr_append(ds, "#define V3D_SHADING_TEXTURE_COLOR\n");
  }
  if (NORMAL_ENCODING_ENABLED()) {
    BLI_dynstr_append(ds, "#define WORKBENCH_ENCODE_NORMALS\n");
  }
  if (is_hair) {
    BLI_dynstr_append(ds, "#define HAIR_SHADER\n");
  }
  if (use_textures && is_tiled) {
    BLI_dynstr_append(ds, "#define TEXTURE_IMAGE_ARRAY\n");
  }

  str = BLI_dynstr_get_cstring(ds);
  BLI_dynstr_free(ds);
  return str;
}

uint workbench_material_get_hash(WORKBENCH_MaterialData *mat, bool is_ghost)
{
  union {
    struct {
      /* WHATCH: Keep in sync with View3DShading.color_type max value. */
      uchar color_type;
      uchar diff_r;
      uchar diff_g;
      uchar diff_b;

      uchar alpha;
      uchar ghost;
      uchar metal;
      uchar roughness;

      void *ima;
    };
    /* HACK to ensure input is 4 uint long. */
    uint a[4];
  } input = {.color_type = (uchar)(mat->color_type),
             .diff_r = (uchar)(mat->base_color[0] * 0xFF),
             .diff_g = (uchar)(mat->base_color[1] * 0xFF),
             .diff_b = (uchar)(mat->base_color[2] * 0xFF),

             .alpha = (uint)(mat->alpha * 0xFF),
             .ghost = (uchar)is_ghost,
             .metal = (uchar)(mat->metallic * 0xFF),
             .roughness = (uchar)(mat->roughness * 0xFF),

             .ima = mat->ima};

  BLI_assert(sizeof(input) == sizeof(uint) * 4);

  return BLI_ghashutil_uinthash_v4((uint *)&input);
}

int workbench_material_get_composite_shader_index(WORKBENCH_PrivateData *wpd)
{
  /* NOTE: change MAX_COMPOSITE_SHADERS accordingly when modifying this function. */
  int index = 0;
  /* 2 bits FLAT/STUDIO/MATCAP + Specular highlight */
  index = wpd->shading.light;
  SET_FLAG_FROM_TEST(index, wpd->shading.flag & V3D_SHADING_SHADOW, 1 << 2);
  SET_FLAG_FROM_TEST(index, wpd->shading.flag & V3D_SHADING_CAVITY, 1 << 3);
  SET_FLAG_FROM_TEST(index, wpd->shading.flag & V3D_SHADING_OBJECT_OUTLINE, 1 << 4);
  SET_FLAG_FROM_TEST(index, workbench_is_matdata_pass_enabled(wpd), 1 << 5);
  SET_FLAG_FROM_TEST(index, workbench_is_specular_highlight_enabled(wpd), 1 << 6);
  // BLI_assert(index < MAX_COMPOSITE_SHADERS);
  return index;
}

int workbench_material_get_prepass_shader_index(WORKBENCH_PrivateData *wpd,
                                                bool is_uniform_color,
                                                bool is_hair,
                                                bool is_tiled,
                                                const WORKBENCH_ColorOverride color_override)
{
  bool use_textures = (wpd->shading.color_type == V3D_SHADING_TEXTURE_COLOR) && !is_uniform_color;
  bool use_vertex_colors = (wpd->shading.color_type == V3D_SHADING_VERTEX_COLOR) &&
                           !is_uniform_color;

  switch (color_override) {
    case WORKBENCH_COLOR_OVERRIDE_TEXTURE:
      use_textures = true;
      use_vertex_colors = false;
      break;
    case WORKBENCH_COLOR_OVERRIDE_VERTEX:
      use_textures = false;
      use_vertex_colors = true;
      is_tiled = false;
      break;
    case WORKBENCH_COLOR_OVERRIDE_OFF:
      break;
  }

  /* NOTE: change MAX_PREPASS_SHADERS accordingly when modifying this function. */
  int index = 0;
  SET_FLAG_FROM_TEST(index, is_hair, 1 << 0);
  SET_FLAG_FROM_TEST(index, workbench_is_matdata_pass_enabled(wpd), 1 << 1);
  SET_FLAG_FROM_TEST(index, OBJECT_ID_PASS_ENABLED(wpd), 1 << 2);
  SET_FLAG_FROM_TEST(index, NORMAL_VIEWPORT_PASS_ENABLED(wpd), 1 << 3);
  SET_FLAG_FROM_TEST(index, MATCAP_ENABLED(wpd), 1 << 4);
  SET_FLAG_FROM_TEST(index, use_textures, 1 << 5);
  SET_FLAG_FROM_TEST(index, use_vertex_colors, 1 << 6);
  SET_FLAG_FROM_TEST(index, is_tiled && use_textures, 1 << 7);
  BLI_assert(index < MAX_PREPASS_SHADERS);
  return index;
}

int workbench_material_get_accum_shader_index(WORKBENCH_PrivateData *wpd,
                                              bool is_uniform_color,
                                              bool is_hair,
                                              bool is_tiled,
                                              const WORKBENCH_ColorOverride color_override)
{
  bool use_textures = (wpd->shading.color_type == V3D_SHADING_TEXTURE_COLOR) && !is_uniform_color;
  bool use_vertex_colors = (wpd->shading.color_type == V3D_SHADING_VERTEX_COLOR) &&
                           !is_uniform_color;

  switch (color_override) {
    case WORKBENCH_COLOR_OVERRIDE_TEXTURE:
      use_textures = true;
      use_vertex_colors = false;
      is_hair = false;
      break;
    case WORKBENCH_COLOR_OVERRIDE_VERTEX:
      use_textures = false;
      use_vertex_colors = true;
      is_hair = false;
      is_tiled = false;
      break;
    case WORKBENCH_COLOR_OVERRIDE_OFF:
      break;
  }

  /* NOTE: change MAX_ACCUM_SHADERS accordingly when modifying this function. */
  int index = 0;
  /* 2 bits FLAT/STUDIO/MATCAP + Specular highlight */
  index = wpd->shading.light;
  SET_FLAG_FROM_TEST(index, use_textures, 1 << 2);
  SET_FLAG_FROM_TEST(index, use_vertex_colors, 1 << 3);
  SET_FLAG_FROM_TEST(index, is_hair, 1 << 4);
  /* 1 bits SHADOWS (only facing factor) */
  SET_FLAG_FROM_TEST(index, SHADOW_ENABLED(wpd), 1 << 5);
  SET_FLAG_FROM_TEST(index, workbench_is_specular_highlight_enabled(wpd), 1 << 6);
  SET_FLAG_FROM_TEST(index, is_tiled && use_textures, 1 << 7);
  BLI_assert(index < MAX_ACCUM_SHADERS);
  return index;
}

/* Return correct material or empty default material if slot is empty. */
BLI_INLINE Material *workbench_object_material_get(Object *ob, int mat_nr)
{
  Material *ma = BKE_object_material_get(ob, mat_nr);
  if (ma == NULL) {
    ma = BKE_material_default_empty();
  }
  return ma;
}

BLI_INLINE void workbench_material_get_image(
    Object *ob, int mat_nr, Image **r_image, ImageUser **r_iuser, int *r_interp)
{
  bNode *node;

  ED_object_get_active_image(ob, mat_nr, r_image, r_iuser, &node, NULL);
  if (node && *r_image) {
    switch (node->type) {
      case SH_NODE_TEX_IMAGE: {
        NodeTexImage *storage = node->storage;
        *r_interp = storage->interpolation;
        break;
      }
      case SH_NODE_TEX_ENVIRONMENT: {
        NodeTexEnvironment *storage = node->storage;
        *r_interp = storage->interpolation;
        break;
      }
      default:
        BLI_assert(!"Node type not supported by workbench");
        *r_interp = 0;
    }
  }
  else {
    *r_interp = 0;
  }
}

/* TODO remove */
void workbench_material_get_image_and_mat(
    Object *ob, int mat_nr, Image **r_image, ImageUser **r_iuser, int *r_interp, Material **r_mat)
{
  *r_mat = workbench_object_material_get(ob, mat_nr);

  if (r_image) {
    workbench_material_get_image(ob, mat_nr, r_image, r_iuser, r_interp);
  }
}

void workbench_material_shgroup_uniform(WORKBENCH_PrivateData *wpd,
                                        DRWShadingGroup *grp,
                                        WORKBENCH_MaterialData *material,
                                        Object *ob,
                                        const bool deferred,
                                        const bool is_tiled,
                                        const int interp)
{
  if (deferred && !workbench_is_matdata_pass_enabled(wpd)) {
    return;
  }

  const bool use_highlight = workbench_is_specular_highlight_enabled(wpd);
  const bool use_texture = (V3D_SHADING_TEXTURE_COLOR == workbench_material_determine_color_type(
                                                             wpd, material->ima, ob, false));
  if (use_texture) {
    if (is_tiled) {
      GPUTexture *array_tex = GPU_texture_from_blender(
          material->ima, material->iuser, NULL, GL_TEXTURE_2D_ARRAY);
      GPUTexture *data_tex = GPU_texture_from_blender(
          material->ima, material->iuser, NULL, GL_TEXTURE_1D_ARRAY);
      DRW_shgroup_uniform_texture(grp, "image_tile_array", array_tex);
      DRW_shgroup_uniform_texture(grp, "image_tile_data", data_tex);
    }
    else {
      GPUTexture *tex = GPU_texture_from_blender(
          material->ima, material->iuser, NULL, GL_TEXTURE_2D);
      DRW_shgroup_uniform_texture(grp, "image", tex);
    }
    DRW_shgroup_uniform_bool_copy(
        grp, "imagePremultiplied", (material->ima->alpha_mode == IMA_ALPHA_PREMUL));
    DRW_shgroup_uniform_bool_copy(grp, "imageNearest", (interp == SHD_INTERP_CLOSEST));
  }

  DRW_shgroup_uniform_vec4(grp, "materialColorAndMetal", material->base_color, 1);

  if (use_highlight) {
    DRW_shgroup_uniform_float(grp, "materialRoughness", &material->roughness, 1);
  }
}

/* TODO remove */
int workbench_material_determine_color_type(WORKBENCH_PrivateData *UNUSED(wpd),
                                            Image *UNUSED(ima),
                                            Object *UNUSED(ob),
                                            bool UNUSED(use_sculpt_pbvh))
{
  return 0;
}

/* Return true if the current material ubo has changed and needs to be rebind. */
static bool workbench_material_chunk_select(WORKBENCH_PrivateData *wpd, uint32_t id)
{
  bool resource_changed = false;
  /* Divide in chunks of MAX_MATERIAL. */
  uint32_t chunk = id >> 12u;
  /* We need to add a new chunk. */
  while (chunk >= wpd->material_chunk_count) {
    wpd->material_chunk_count++;
    wpd->material_ubo_data_curr = BLI_memblock_alloc(wpd->material_ubo_data);
    wpd->material_ubo_curr = workbench_material_ubo_alloc(wpd);
    wpd->material_chunk_curr = chunk;
    resource_changed = true;
  }
  /* We need to go back to a previous chunk. */
  if (wpd->material_chunk_curr != chunk) {
    wpd->material_ubo_data_curr = BLI_memblock_elem_get(wpd->material_ubo_data, 0, chunk);
    wpd->material_ubo_curr = BLI_memblock_elem_get(wpd->material_ubo, 0, chunk);
    wpd->material_chunk_curr = chunk;
    resource_changed = true;
  }
  return resource_changed;
}

DRWShadingGroup *workbench_material_setup(
    WORKBENCH_PrivateData *wpd, Object *ob, int mat_nr, int color_type, bool hair)
{
  Image *ima = NULL;
  ImageUser *iuser = NULL;
  int interp;
  const bool infront = (ob->dtx & OB_DRAWXRAY) != 0;

  if (color_type == V3D_SHADING_TEXTURE_COLOR) {
    workbench_material_get_image(ob, mat_nr, &ima, &iuser, &interp);
    if (ima == NULL) {
      /* Fallback to material color. */
      color_type = V3D_SHADING_MATERIAL_COLOR;
    }
  }

  switch (color_type) {
    case V3D_SHADING_TEXTURE_COLOR: {
      return workbench_image_setup(wpd, ob, mat_nr, ima, iuser, interp, hair);
    }
    case V3D_SHADING_MATERIAL_COLOR: {
      /* For now, we use the same ubo for material and object coloring but with different indices.
       * This means they are mutually exclusive. */
      BLI_assert(
          ELEM(wpd->shading.color_type, V3D_SHADING_MATERIAL_COLOR, V3D_SHADING_TEXTURE_COLOR));

      Material *ma = workbench_object_material_get(ob, mat_nr);

      const bool transp = wpd->shading.xray_alpha < 1.0f || ma->a < 1.0f;
      WORKBENCH_Prepass *prepass = &wpd->prepass[transp][infront][hair];

      DRWShadingGroup **grp_mat = NULL;
      /* A hashmap stores material shgroups to pack all similar drawcalls together. */
      if (BLI_ghash_ensure_p(prepass->material_hash, ma, (void ***)&grp_mat)) {
        return *grp_mat;
      }

      uint32_t id = wpd->material_index++;

      workbench_material_chunk_select(wpd, id);
      workbench_material_ubo_data(wpd, ob, ma, &wpd->material_ubo_data_curr[id], color_type);

      DRWShadingGroup *grp = prepass->common_shgrp;
      *grp_mat = grp = DRW_shgroup_create_sub(grp);
      DRW_shgroup_uniform_block(grp, "material_block", wpd->material_ubo_curr);
      DRW_shgroup_uniform_int_copy(grp, "materialIndex", id & 0xFFFu);
      return grp;
    }
    case V3D_SHADING_VERTEX_COLOR: {
      const bool transp = wpd->shading.xray_alpha < 1.0f;
      DRWShadingGroup *grp = wpd->prepass[transp][infront][hair].vcol_shgrp;
      return grp;
    }
    default: {
      /* For now, we use the same ubo for material and object coloring but with different indices.
       * This means they are mutually exclusive. */
      BLI_assert(
          !ELEM(wpd->shading.color_type, V3D_SHADING_MATERIAL_COLOR, V3D_SHADING_TEXTURE_COLOR));

      uint32_t id = DRW_object_resource_id_get(ob);

      bool resource_changed = workbench_material_chunk_select(wpd, id);
      workbench_material_ubo_data(wpd, ob, NULL, &wpd->material_ubo_data_curr[id], color_type);

      const bool transp = wpd->shading.xray_alpha < 1.0f || ob->color[3] < 1.0f;
      DRWShadingGroup *grp = wpd->prepass[transp][infront][hair].common_shgrp;
      if (resource_changed) {
        grp = DRW_shgroup_create_sub(grp);
        DRW_shgroup_uniform_block(grp, "material_block", wpd->material_ubo_curr);
      }
      return grp;
    }
  }
}

/* If ima is null, search appropriate image node but will fallback to purple texture otherwise. */
DRWShadingGroup *workbench_image_setup(WORKBENCH_PrivateData *wpd,
                                       Object *ob,
                                       int mat_nr,
                                       Image *ima,
                                       ImageUser *iuser,
                                       int interp,
                                       bool hair)
{
  GPUTexture *tex = NULL, *tex_tile_data = NULL;

  if (ima == NULL) {
    workbench_material_get_image(ob, mat_nr, &ima, &iuser, &interp);
  }

  if (ima) {
    if (ima->source == IMA_SRC_TILED) {
      tex = GPU_texture_from_blender(ima, iuser, NULL, GL_TEXTURE_2D_ARRAY);
      tex_tile_data = GPU_texture_from_blender(ima, iuser, NULL, GL_TEXTURE_1D_ARRAY);
    }
    else {
      tex = GPU_texture_from_blender(ima, iuser, NULL, GL_TEXTURE_2D);
    }
  }

  if (tex == NULL) {
    printf("Image not foudn\n");
    tex = wpd->dummy_image_tx;
  }

  const bool infront = (ob->dtx & OB_DRAWXRAY) != 0;
  const bool transp = wpd->shading.xray_alpha < 1.0f;
  WORKBENCH_Prepass *prepass = &wpd->prepass[transp][infront][hair];

  DRWShadingGroup **grp_tex = NULL;
  /* A hashmap stores image shgroups to pack all similar drawcalls together. */
  if (BLI_ghash_ensure_p(prepass->material_hash, tex, (void ***)&grp_tex)) {
    return *grp_tex;
  }

  DRWShadingGroup *grp = (tex_tile_data) ? prepass->image_tiled_shgrp : prepass->image_shgrp;

  *grp_tex = grp = DRW_shgroup_create_sub(grp);
  if (tex_tile_data) {
    DRW_shgroup_uniform_texture_persistent(grp, "imageTileArray", tex);
    DRW_shgroup_uniform_texture_persistent(grp, "imageTileData", tex_tile_data);
  }
  else {
    DRW_shgroup_uniform_texture_persistent(grp, "imageTexture", tex);
  }
  DRW_shgroup_uniform_bool_copy(grp, "imagePremult", (ima && ima->alpha_mode == IMA_ALPHA_PREMUL));
  DRW_shgroup_uniform_bool_copy(grp, "imageNearest", (interp == SHD_INTERP_CLOSEST));
  return grp;
}

void workbench_material_copy(WORKBENCH_MaterialData *dest_material,
                             const WORKBENCH_MaterialData *source_material)
{
  copy_v3_v3(dest_material->base_color, source_material->base_color);
  dest_material->metallic = source_material->metallic;
  dest_material->roughness = source_material->roughness;
  dest_material->ima = source_material->ima;
  dest_material->iuser = source_material->iuser;
}