Sculpt: Rewrite PBVH draw

Rewrite PBVH draw to allocate attributes into individual VBOs.
The old system tried to create a single VBO that could feed
every open viewport.  This required uploading every color and
UV attribute  to the viewport whether needed or not, often exceeding
the VBO limit.

This new system creates one VBO per attribute.  Each attribute layout is
given its own GPU batch which is cached inside the owning PBVH node.

Notes:

* This is a full C++ rewrite.  The old code is still there; ripping it out
can happen later.
* PBVH nodes now have a collection of batches, PBVHBatches, that keeps
track of all the batches inside the node.
* Batches are built exclusively from a list of attributes.
* Each attribute has its own VBO.
* Overlays, workbench and EEVEE can all have different attribute
  layouts, each of which will get its own batch.

Reviewed by: Clement Foucault
Differential Revision: https://developer.blender.org/D15428
Ref D15428

1 files changed, 0 insertions, 157 deletions

diff --git a/source/blender/gpu/GPU_buffers.h b/source/blender/gpu/GPU_buffers.h
deleted file mode 100644
index 5cdc5f19540..00000000000
--- a/source/blender/gpu/GPU_buffers.h
+++ /dev/null
@@ -1,157 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later
- * Copyright 2005 Blender Foundation. All rights reserved. */
-
-/** \file
- * \ingroup gpu
- */
-
-#pragma once
-
-#include <stddef.h>
-
-#include "BKE_attribute.h"
-#include "BKE_pbvh.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct BMesh;
-struct CCGElem;
-struct CCGKey;
-struct DMFlagMat;
-struct GSet;
-struct TableGSet;
-struct Mesh;
-struct MLoop;
-struct MLoopCol;
-struct MLoopTri;
-struct MPoly;
-struct MPropCol;
-struct MVert;
-struct Mesh;
-struct PBVH;
-struct SubdivCCG;
-struct CustomData;
-
-typedef struct PBVHGPUFormat PBVHGPUFormat;
-
-/**
- * Buffers for drawing from PBVH grids.
- */
-typedef struct GPU_PBVH_Buffers GPU_PBVH_Buffers;
-
-/**
- * Build must be called once before using the other functions,
- * used every time mesh topology changes.
- *
- * Threaded: do not call any functions that use OpenGL calls!
- */
-GPU_PBVH_Buffers *GPU_pbvh_mesh_buffers_build(const struct Mesh *mesh,
-                                              const struct MLoopTri *looptri,
-                                              const int *face_indices,
-                                              int face_indices_len);
-
-/**
- * Threaded: do not call any functions that use OpenGL calls!
- */
-GPU_PBVH_Buffers *GPU_pbvh_grid_buffers_build(int totgrid,
-                                              unsigned int **grid_hidden,
-                                              bool smooth);
-
-/**
- * Threaded: do not call any functions that use OpenGL calls!
- */
-GPU_PBVH_Buffers *GPU_pbvh_bmesh_buffers_build(bool smooth_shading);
-
-/**
- * Free part of data for update. Not thread safe, must run in OpenGL main thread.
- */
-void GPU_pbvh_bmesh_buffers_update_free(GPU_PBVH_Buffers *buffers);
-void GPU_pbvh_grid_buffers_update_free(GPU_PBVH_Buffers *buffers,
-                                       const struct DMFlagMat *grid_flag_mats,
-                                       const int *grid_indices);
-
-/**
- * Update mesh buffers without topology changes. Threaded.
- */
-enum {
-  GPU_PBVH_BUFFERS_SHOW_MASK = (1 << 1),
-  GPU_PBVH_BUFFERS_SHOW_VCOL = (1 << 2),
-  GPU_PBVH_BUFFERS_SHOW_SCULPT_FACE_SETS = (1 << 3),
-};
-
-/**
- * Creates a vertex buffer (coordinate, normal, color) and,
- * if smooth shading, an element index buffer.
- * Threaded: do not call any functions that use OpenGL calls!
- */
-void GPU_pbvh_mesh_buffers_update(PBVHGPUFormat *vbo_id,
-                                  GPU_PBVH_Buffers *buffers,
-                                  const struct Mesh *mesh,
-                                  const struct MVert *mvert,
-                                  const float *vmask,
-                                  const int *sculpt_face_sets,
-                                  const int face_sets_color_seed,
-                                  const int face_sets_color_default,
-                                  const int update_flags,
-                                  const float (*vert_normals)[3]);
-
-bool GPU_pbvh_attribute_names_update(PBVHType pbvh_type,
-                                     PBVHGPUFormat *vbo_id,
-                                     const struct CustomData *vdata,
-                                     const struct CustomData *ldata,
-                                     bool active_attrs_only);
-
-/**
- * Creates a vertex buffer (coordinate, normal, color) and,
- * if smooth shading, an element index buffer.
- * Threaded: do not call any functions that use OpenGL calls!
- */
-void GPU_pbvh_bmesh_buffers_update(PBVHGPUFormat *vbo_id,
-                                   struct GPU_PBVH_Buffers *buffers,
-                                   struct BMesh *bm,
-                                   struct GSet *bm_faces,
-                                   struct GSet *bm_unique_verts,
-                                   struct GSet *bm_other_verts,
-                                   const int update_flags);
-
-/**
- * Threaded: do not call any functions that use OpenGL calls!
- */
-void GPU_pbvh_grid_buffers_update(PBVHGPUFormat *vbo_id,
-                                  GPU_PBVH_Buffers *buffers,
-                                  struct SubdivCCG *subdiv_ccg,
-                                  struct CCGElem **grids,
-                                  const struct DMFlagMat *grid_flag_mats,
-                                  int *grid_indices,
-                                  int totgrid,
-                                  const int *sculpt_face_sets,
-                                  int face_sets_color_seed,
-                                  int face_sets_color_default,
-                                  const struct CCGKey *key,
-                                  int update_flags);
-
-/**
- * Finish update. Not thread safe, must run in OpenGL main
- * thread.
- */
-void GPU_pbvh_buffers_update_flush(GPU_PBVH_Buffers *buffers);
-
-/**
- * Free buffers. Not thread safe, must run in OpenGL main thread.
- */
-void GPU_pbvh_buffers_free(GPU_PBVH_Buffers *buffers);
-
-/** Draw. */
-struct GPUBatch *GPU_pbvh_buffers_batch_get(GPU_PBVH_Buffers *buffers, bool fast, bool wires);
-
-short GPU_pbvh_buffers_material_index_get(GPU_PBVH_Buffers *buffers);
-bool GPU_pbvh_buffers_has_overlays(GPU_PBVH_Buffers *buffers);
-
-PBVHGPUFormat *GPU_pbvh_make_format(void);
-void GPU_pbvh_free_format(PBVHGPUFormat *vbo_id);
-
-#ifdef __cplusplus
-}
-#endif