draw_compressed_lod.task.glsl

/*
 * Copyright (c) 2022-2023, NVIDIA CORPORATION.  All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-FileCopyrightText: Copyright (c) 2022-2023 NVIDIA CORPORATION
 * SPDX-License-Identifier: Apache-2.0
 */
#version 460

#extension GL_GOOGLE_include_directive : enable
#extension GL_EXT_control_flow_attributes : require

#extension GL_NV_mesh_shader : enable

#extension GL_EXT_buffer_reference2 : enable
#extension GL_EXT_scalar_block_layout : enable
#extension GL_EXT_shader_8bit_storage : enable
#extension GL_EXT_shader_16bit_storage : enable
#extension GL_EXT_shader_explicit_arithmetic_types_float16 : enable
#extension GL_EXT_shader_explicit_arithmetic_types_int8 : enable
#extension GL_EXT_shader_explicit_arithmetic_types_int32 : enable
#extension GL_EXT_shader_explicit_arithmetic_types_int16 : enable
#extension GL_EXT_shader_explicit_arithmetic_types_int64 : enable
#extension GL_EXT_shader_atomic_int64 : enable

#extension GL_KHR_shader_subgroup_basic : require
#extension GL_KHR_shader_subgroup_ballot : require
#extension GL_KHR_shader_subgroup_vote : require
#extension GL_KHR_shader_subgroup_shuffle : require
#extension GL_KHR_shader_subgroup_arithmetic : require
#extension GL_NV_shader_subgroup_partitioned : require

#include "common.h"
#include "common_mesh.h"
#include "common_barymap.h"
#include "common_micromesh_uncompressed.h"
#include "common_micromesh_compressed.h"
#include "micromesh_binpack_decl.glsl"

//////////////////////////////////////////////////////////////////////////

layout(local_size_x=MICRO_GROUP_SIZE) in;

////////////////////////////////////////////////////////////////
// BINDINGS

layout(scalar, binding = DRAWCOMPRESSED_UBO_VIEW) uniform sceneBuffer {
  SceneData scene;
  SceneData sceneLast;
};
layout(scalar, binding = DRAWCOMPRESSED_SSBO_STATS) coherent buffer statsBuffer {
  ShaderStats stats;
};
layout(scalar, binding = DRAWCOMPRESSED_UBO_COMPRESSED) uniform microBuffer {
  MicromeshData microdata;
};
layout(scalar, binding = DRAWCOMPRESSED_UBO_MESH) uniform meshBuffer {
  MeshData mesh;
};
#if USE_OCCLUSION_CULLING
  #define SUPPORTS_HIZ 1
  layout(binding = DRAWCOMPRESSED_TEX_HIZ)  uniform sampler2D texHizFar;
#endif

layout(push_constant) uniform pushDraw {
  DrawMicromeshPushData push;
};


//////////////////////////////////////////////////////////////////////////
// OUTPUT

taskNV out Task
{
  MicroBinPack binpack;
} OUT;

////////////////////////////////////////////////////////////////////////////////

#include "draw_culling.glsl"
#include "micromesh_utils.glsl"
#include "micromesh_culling_compressed.glsl"

// MicroBinPack functions need to reference target variables directly via macros
#define MICROBINPACK_USE_MESHLETCOUNT   0
#define MICROBINPACK_OUT                OUT.binpack
#define MICROBINPACK_OUT_COUNT          gl_TaskCountNV
#include "micromesh_binpack.glsl"

////////////////////////////////////////////////////////////////////////////////

void main()
{
  uint baseID = gl_WorkGroupID.x * MICRO_TRI_PER_TASK;
  uint laneID = gl_SubgroupInvocationID;

  uint microMax     = push.microMax;
  
  //if (baseID != 0) return;
  //microMax = 16;
  
  bool valid        = baseID + laneID <= microMax;
  uint relativeID   = valid ? laneID : 0;  
  uint microID      = baseID + relativeID;
  
  uint targetSubdiv = cullAndLodMicroBaseTriangle(microID, valid);
  
  MicroBinPack_subgroupPack(baseID, relativeID, targetSubdiv, 0, valid);
}