vk_vertex_attribute_object.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "vk_vertex_attribute_object.hh"
 
#include "vk_batch.hh"
#include "vk_context.hh"
#include "vk_immediate.hh"
#include "vk_shader.hh"
#include "vk_shader_interface.hh"
#include "vk_vertex_buffer.hh"
 
#include "BLI_bit_vector.hh"
#include "BLI_math_vector_types.hh"
 
namespace blender::gpu {
VKVertexAttributeObject::VKVertexAttributeObject()
{
  clear();
}
 
void VKVertexAttributeObject::clear()
{
  is_valid = false;
  info.pNext = nullptr;
  bindings.clear();
  attributes.clear();
  vbos.clear();
  buffers.clear();
}
 
VKVertexAttributeObject &VKVertexAttributeObject::operator=(const VKVertexAttributeObject &other)
{
  if (this == &other) {
    return *this;
  }
 
  is_valid = other.is_valid;
  info = other.info;
  bindings.clear();
  bindings.extend(other.bindings);
  attributes.clear();
  attributes.extend(other.attributes);
  vbos.clear();
  vbos.extend(other.vbos);
  buffers.clear();
  buffers.extend(other.buffers);
  return *this;
}
 
/* -------------------------------------------------------------------- */
 
void VKVertexAttributeObject::bind(
    render_graph::VKVertexBufferBindings &r_vertex_buffer_bindings) const
{
  BitVector visited_bindings(bindings.size());
 
  const VKBuffer &dummy = VKBackend::get().device.dummy_buffer;
  for (VkVertexInputAttributeDescription attribute : attributes) {
    if (visited_bindings[attribute.binding]) {
      continue;
    }
    visited_bindings[attribute.binding].set(true);
 
    VkBuffer buffer = dummy.vk_handle();
    VkDeviceSize offset = 0;
 
    if (attribute.binding < buffers.size()) {
      buffer = buffers[attribute.binding].buffer;
      offset = buffers[attribute.binding].offset;
    }
 
    r_vertex_buffer_bindings.buffer[attribute.binding] = buffer;
    r_vertex_buffer_bindings.offset[attribute.binding] = offset;
    r_vertex_buffer_bindings.buffer_count = max_ii(r_vertex_buffer_bindings.buffer_count,
                                                   attribute.binding + 1);
  }
}

 
/* -------------------------------------------------------------------- */
 
void VKVertexAttributeObject::update_bindings(const VKContext &context, VKBatch &batch)
{
  clear();
  const VKShaderInterface &interface = unwrap(context.shader)->interface_get();
  AttributeMask occupied_attributes = 0;
 
  for (int v = 0; v < GPU_BATCH_INST_VBO_MAX_LEN; v++) {
    VKVertexBuffer *vbo = batch.instance_buffer_get(v);
    if (vbo) {
      update_bindings(
          vbo->format, vbo, nullptr, vbo->vertex_len, interface, occupied_attributes, true);
    }
  }
  for (int v = 0; v < GPU_BATCH_VBO_MAX_LEN; v++) {
    VKVertexBuffer *vbo = batch.vertex_buffer_get(v);
    if (vbo) {
      update_bindings(
          vbo->format, vbo, nullptr, vbo->vertex_len, interface, occupied_attributes, false);
    }
  }
 
  if (occupied_attributes != interface.enabled_attr_mask_) {
    fill_unused_bindings(interface, occupied_attributes);
  }
  is_valid = true;
}
 
/* Determine the number of binding location the given attribute uses. */
static uint32_t to_binding_location_len(const GPUVertAttr &attribute)
{
  return ceil_division(attribute.comp_len, 4u);
}
 
/* Determine the number of binding location the given type uses. */
static uint32_t to_binding_location_len(const shader::Type type)
{
  switch (type) {
    case shader::Type::float_t:
    case shader::Type::float2_t:
    case shader::Type::float3_t:
    case shader::Type::float4_t:
    case shader::Type::uint_t:
    case shader::Type::uint2_t:
    case shader::Type::uint3_t:
    case shader::Type::uint4_t:
    case shader::Type::int_t:
    case shader::Type::int2_t:
    case shader::Type::int3_t:
    case shader::Type::int4_t:
    case shader::Type::bool_t:
    case shader::Type::float3_10_10_10_2_t:
    case shader::Type::uchar_t:
    case shader::Type::uchar2_t:
    case shader::Type::uchar3_t:
    case shader::Type::uchar4_t:
    case shader::Type::char_t:
    case shader::Type::char2_t:
    case shader::Type::char3_t:
    case shader::Type::char4_t:
    case shader::Type::short_t:
    case shader::Type::short2_t:
    case shader::Type::short3_t:
    case shader::Type::short4_t:
    case shader::Type::ushort_t:
    case shader::Type::ushort2_t:
    case shader::Type::ushort3_t:
    case shader::Type::ushort4_t:
      return 1;
    case shader::Type::float3x3_t:
      return 3;
    case shader::Type::float4x4_t:
      return 4;
  }
 
  return 1;
}
 
void VKVertexAttributeObject::fill_unused_bindings(const VKShaderInterface &interface,
                                                   const AttributeMask occupied_attributes)
{
  for (int location : IndexRange(16)) {
    AttributeMask location_mask = 1 << location;
    /* Skip occupied slots */
    if (occupied_attributes & location_mask) {
      continue;
    }
    /* Skip slots that are not used by the vertex shader. */
    if ((interface.enabled_attr_mask_ & location_mask) == 0) {
      continue;
    }
 
    /* Use dummy binding. */
    shader::Type attribute_type = interface.get_attribute_type(location);
    const uint32_t num_locations = to_binding_location_len(attribute_type);
    for (const uint32_t location_offset : IndexRange(num_locations)) {
      const uint32_t binding = bindings.size();
      VkVertexInputAttributeDescription attribute_description = {};
      attribute_description.binding = binding;
      attribute_description.location = location + location_offset;
      attribute_description.offset = 0;
      attribute_description.format = to_vk_format(attribute_type);
      attributes.append(attribute_description);
 
      VkVertexInputBindingDescription vk_binding_descriptor = {};
      vk_binding_descriptor.binding = binding;
      vk_binding_descriptor.stride = 0;
      vk_binding_descriptor.inputRate = VK_VERTEX_INPUT_RATE_INSTANCE;
      bindings.append(vk_binding_descriptor);
    }
  }
}
 
void VKVertexAttributeObject::update_bindings(VKImmediate &immediate)
{
  clear();
  const VKShaderInterface &interface = unwrap(unwrap(immediate.shader))->interface_get();
  AttributeMask occupied_attributes = 0;
 
  VKBufferWithOffset immediate_buffer = immediate.active_buffer();
  update_bindings(immediate.vertex_format,
                  nullptr,
                  &immediate_buffer,
                  immediate.vertex_len,
                  interface,
                  occupied_attributes,
                  false);
  is_valid = true;
  BLI_assert(interface.enabled_attr_mask_ == occupied_attributes);
}
 
void VKVertexAttributeObject::update_bindings(const GPUVertFormat &vertex_format,
                                              VKVertexBuffer *vertex_buffer,
                                              VKBufferWithOffset *immediate_vertex_buffer,
                                              const int64_t vertex_len,
                                              const VKShaderInterface &interface,
                                              AttributeMask &r_occupied_attributes,
                                              const bool use_instancing)
{
  BLI_assert(vertex_buffer || immediate_vertex_buffer);
  BLI_assert(!(vertex_buffer && immediate_vertex_buffer));
 
  if (vertex_format.attr_len <= 0) {
    return;
  }
 
  /* Interleaved offset is added to the buffer binding. Attribute offsets are hardware
   * restricted (ref: VUID-VkVertexInputAttributeDescription-offset-00622). */
  uint32_t buffer_offset = 0;
  uint32_t attribute_offset = 0;
  uint32_t stride = vertex_format.stride;
 
  bool add_vbo = false;
 
  for (uint32_t attribute_index = 0; attribute_index < vertex_format.attr_len; attribute_index++) {
    const GPUVertAttr &attribute = vertex_format.attrs[attribute_index];
    if (vertex_format.deinterleaved) {
      buffer_offset += ((attribute_index == 0) ? 0 :
                                                 vertex_format.attrs[attribute_index - 1].size) *
                       vertex_len;
      stride = attribute.size;
    }
    else {
      attribute_offset = attribute.offset;
    }
 
    for (uint32_t name_index = 0; name_index < attribute.name_len; name_index++) {
      const char *name = GPU_vertformat_attr_name_get(&vertex_format, &attribute, name_index);
      const ShaderInput *shader_input = interface.attr_get(name);
      if (shader_input == nullptr || shader_input->location == -1) {
        continue;
      }
 
      /* Don't overwrite attributes that are already occupied. */
      AttributeMask attribute_mask = 1 << shader_input->location;
      if (r_occupied_attributes & attribute_mask) {
        continue;
      }
      r_occupied_attributes |= attribute_mask;
      const uint32_t num_locations = to_binding_location_len(attribute);
      for (const uint32_t location_offset : IndexRange(num_locations)) {
        const uint32_t binding = bindings.size();
        VkVertexInputAttributeDescription attribute_description = {};
        attribute_description.binding = binding;
        attribute_description.location = shader_input->location + location_offset;
        attribute_description.offset = attribute_offset + location_offset * sizeof(float4);
        attribute_description.format = to_vk_format(
            static_cast<GPUVertCompType>(attribute.comp_type),
            attribute.size,
            static_cast<GPUVertFetchMode>(attribute.fetch_mode));
        attributes.append(attribute_description);
 
        VkVertexInputBindingDescription vk_binding_descriptor = {};
        vk_binding_descriptor.binding = binding;
        vk_binding_descriptor.stride = stride;
        vk_binding_descriptor.inputRate = use_instancing ? VK_VERTEX_INPUT_RATE_INSTANCE :
                                                           VK_VERTEX_INPUT_RATE_VERTEX;
        bindings.append(vk_binding_descriptor);
        if (vertex_buffer) {
          add_vbo = true;
          vertex_buffer->upload();
          buffers.append({vertex_buffer->vk_handle(), buffer_offset});
        }
        if (immediate_vertex_buffer) {
          buffers.append(*immediate_vertex_buffer);
        }
      }
    }
  }
 
  if (add_vbo) {
    BLI_assert(vertex_buffer != nullptr);
    vbos.append(vertex_buffer);
  }
}

 
/* -------------------------------------------------------------------- */
 
void VKVertexAttributeObject::debug_print() const
{
  std::cout << __FILE__ << "::" << __func__ << "\n";
  BitVector visited_bindings(bindings.size());
 
  for (VkVertexInputAttributeDescription attribute : attributes) {
    std::cout << " - attribute(binding=" << attribute.binding
              << ", location=" << attribute.location << ")";
 
    if (visited_bindings[attribute.binding]) {
      std::cout << " WARNING: Already bound\n";
      continue;
    }
    visited_bindings[attribute.binding].set(true);
 
    if (attribute.binding < vbos.size()) {
      std::cout << " Attach to Buffer\n";
    }
    else {
      std::cout << " WARNING: Attach to dummy\n";
    }
  }
}

 
}  // namespace blender::gpu