eevee_ambient_occlusion.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "eevee_ambient_occlusion.hh"
#include "eevee_instance.hh"
 
#include "GPU_capabilities.hh"
 
namespace blender::eevee {
 
/* -------------------------------------------------------------------- */
void AmbientOcclusion::init()
{
  render_pass_enabled_ = inst_.film.enabled_passes_get() & EEVEE_RENDER_PASS_AO;
 
  const SceneEEVEE &sce_eevee = inst_.scene->eevee;
 
  data_.distance = sce_eevee.gtao_distance;
  data_.gi_distance = (sce_eevee.fast_gi_distance > 0.0f) ? sce_eevee.fast_gi_distance : 1e16f;
  /* AO node uses its own number of samples. */
  data_.lod_factor_ao = 1.0f / (1.0f + sce_eevee.fast_gi_quality * 4.0f);
  data_.lod_factor = (4.0f / sce_eevee.fast_gi_step_count) /
                     (1.0f + sce_eevee.fast_gi_quality * 4.0f);
  data_.angle_bias = 1.0 / max_ff(1e-8f, 1.0 - sce_eevee.gtao_focus);
  data_.thickness_near = sce_eevee.fast_gi_thickness_near;
  data_.thickness_far = sce_eevee.fast_gi_thickness_far;
  /* Size is multiplied by 2 because it is applied in NDC [-1..1] range. */
  data_.pixel_size = float2(2.0f) / float2(inst_.film.render_extent_get());
 
  ray_count_ = sce_eevee.fast_gi_ray_count;
  step_count_ = sce_eevee.fast_gi_step_count;
}
 
void AmbientOcclusion::sync()
{
  if (!render_pass_enabled_) {
    return;
  }
 
  render_pass_ps_.init();
  GPUShader *sh = inst_.shaders.static_shader_get(AMBIENT_OCCLUSION_PASS);
  render_pass_ps_.specialize_constant(sh, "ao_slice_count", ray_count_);
  render_pass_ps_.specialize_constant(sh, "ao_step_count", step_count_);
  render_pass_ps_.shader_set(sh);
 
  render_pass_ps_.bind_texture(RBUFS_UTILITY_TEX_SLOT, &inst_.pipelines.utility_tx);
  render_pass_ps_.bind_resources(inst_.uniform_data);
  render_pass_ps_.bind_resources(inst_.sampling);
  render_pass_ps_.bind_resources(inst_.hiz_buffer.front);
 
  render_pass_ps_.bind_image("in_normal_img", &inst_.render_buffers.rp_color_tx);
  render_pass_ps_.push_constant("in_normal_img_layer_index", &inst_.render_buffers.data.normal_id);
  render_pass_ps_.bind_image("out_ao_img", &inst_.render_buffers.rp_value_tx);
  render_pass_ps_.push_constant("out_ao_img_layer_index",
                                &inst_.render_buffers.data.ambient_occlusion_id);
 
  render_pass_ps_.barrier(GPU_BARRIER_SHADER_IMAGE_ACCESS | GPU_BARRIER_TEXTURE_FETCH);
  render_pass_ps_.dispatch(
      math::divide_ceil(inst_.film.render_extent_get(), int2(AMBIENT_OCCLUSION_PASS_TILE_SIZE)));
}
 
void AmbientOcclusion::render_pass(View &view)
{
  if (!render_pass_enabled_) {
    return;
  }
 
  inst_.hiz_buffer.update();
  inst_.manager->submit(render_pass_ps_, view);
}
 
}  // namespace blender::eevee