Cleanup: Move draw_cache_impl_pointcloud.c to C++

1 files changed, 281 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache_impl_pointcloud.cc b/source/blender/draw/intern/draw_cache_impl_pointcloud.cc
new file mode 100644
index 00000000000..42fa7988181
--- /dev/null
+++ b/source/blender/draw/intern/draw_cache_impl_pointcloud.cc
@@ -0,0 +1,281 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2017 Blender Foundation. All rights reserved. */
+
+/** \file
+ * \ingroup draw
+ *
+ * \brief PointCloud API for render engines
+ */
+
+#include <string.h>
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_math_base.h"
+#include "BLI_math_vector.h"
+#include "BLI_utildefines.h"
+
+#include "DNA_object_types.h"
+#include "DNA_pointcloud_types.h"
+
+#include "BKE_customdata.h"
+#include "BKE_pointcloud.h"
+
+#include "GPU_batch.h"
+
+#include "draw_cache_impl.h" /* own include */
+
+static void pointcloud_batch_cache_clear(PointCloud *pointcloud);
+
+/* ---------------------------------------------------------------------- */
+/* PointCloud GPUBatch Cache */
+
+struct PointCloudBatchCache {
+  GPUVertBuf *pos;  /* Position and radius. */
+  GPUVertBuf *geom; /* Instanced geometry for each point in the cloud (small sphere). */
+  GPUIndexBuf *geom_indices;
+
+  GPUBatch *dots;
+  GPUBatch *surface;
+  GPUBatch **surface_per_mat;
+
+  /* settings to determine if cache is invalid */
+  bool is_dirty;
+
+  int mat_len;
+};
+
+/* GPUBatch cache management. */
+
+static PointCloudBatchCache *pointcloud_batch_cache_get(PointCloud *pointcloud)
+{
+  return static_cast<PointCloudBatchCache *>(pointcloud->batch_cache);
+}
+
+static bool pointcloud_batch_cache_valid(PointCloud *pointcloud)
+{
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+
+  if (cache == NULL) {
+    return false;
+  }
+  if (cache->mat_len != DRW_pointcloud_material_count_get(pointcloud)) {
+    return false;
+  }
+  return cache->is_dirty == false;
+}
+
+static void pointcloud_batch_cache_init(PointCloud *pointcloud)
+{
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+
+  if (!cache) {
+    cache = MEM_cnew<PointCloudBatchCache>(__func__);
+    pointcloud->batch_cache = cache;
+  }
+  else {
+    memset(cache, 0, sizeof(*cache));
+  }
+
+  cache->mat_len = DRW_pointcloud_material_count_get(pointcloud);
+  cache->surface_per_mat = static_cast<GPUBatch **>(
+      MEM_callocN(sizeof(GPUBatch *) * cache->mat_len, __func__));
+
+  cache->is_dirty = false;
+}
+
+void DRW_pointcloud_batch_cache_validate(PointCloud *pointcloud)
+{
+  if (!pointcloud_batch_cache_valid(pointcloud)) {
+    pointcloud_batch_cache_clear(pointcloud);
+    pointcloud_batch_cache_init(pointcloud);
+  }
+}
+
+void DRW_pointcloud_batch_cache_dirty_tag(PointCloud *pointcloud, int mode)
+{
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+  if (cache == NULL) {
+    return;
+  }
+  switch (mode) {
+    case BKE_POINTCLOUD_BATCH_DIRTY_ALL:
+      cache->is_dirty = true;
+      break;
+    default:
+      BLI_assert(0);
+  }
+}
+
+static void pointcloud_batch_cache_clear(PointCloud *pointcloud)
+{
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+  if (!cache) {
+    return;
+  }
+
+  GPU_BATCH_DISCARD_SAFE(cache->dots);
+  GPU_BATCH_DISCARD_SAFE(cache->surface);
+  GPU_VERTBUF_DISCARD_SAFE(cache->pos);
+  GPU_VERTBUF_DISCARD_SAFE(cache->geom);
+  GPU_INDEXBUF_DISCARD_SAFE(cache->geom_indices);
+
+  if (cache->surface_per_mat) {
+    for (int i = 0; i < cache->mat_len; i++) {
+      GPU_BATCH_DISCARD_SAFE(cache->surface_per_mat[i]);
+    }
+  }
+  MEM_SAFE_FREE(cache->surface_per_mat);
+}
+
+void DRW_pointcloud_batch_cache_free(PointCloud *pointcloud)
+{
+  pointcloud_batch_cache_clear(pointcloud);
+  MEM_SAFE_FREE(pointcloud->batch_cache);
+}
+
+static void pointcloud_batch_cache_ensure_pos(Object *ob, PointCloudBatchCache *cache)
+{
+  if (cache->pos != NULL) {
+    return;
+  }
+
+  PointCloud *pointcloud = static_cast<PointCloud *>(ob->data);
+  const float(*positions)[3] = (float(*)[3])CustomData_get_layer_named(
+      &pointcloud->pdata, CD_PROP_FLOAT3, "position");
+  const float *radii = (float *)CustomData_get_layer_named(
+      &pointcloud->pdata, CD_PROP_FLOAT, "radius");
+  const bool has_radius = radii != NULL;
+
+  static GPUVertFormat format = {0};
+  static GPUVertFormat format_no_radius = {0};
+  static uint pos;
+  if (format.attr_len == 0) {
+    /* initialize vertex format */
+    /* From the opengl wiki:
+     * Note that size does not have to exactly match the size used by the vertex shader. If the
+     * vertex shader has fewer components than the attribute provides, then the extras are ignored.
+     * If the vertex shader has more components than the array provides, the extras are given
+     * values from the vector (0, 0, 0, 1) for the missing XYZW components.
+     */
+    pos = GPU_vertformat_attr_add(&format_no_radius, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+    pos = GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
+  }
+
+  cache->pos = GPU_vertbuf_create_with_format(has_radius ? &format : &format_no_radius);
+  GPU_vertbuf_data_alloc(cache->pos, pointcloud->totpoint);
+
+  if (has_radius) {
+    float(*vbo_data)[4] = (float(*)[4])GPU_vertbuf_get_data(cache->pos);
+    for (int i = 0; i < pointcloud->totpoint; i++) {
+      copy_v3_v3(vbo_data[i], positions[i]);
+      /* TODO(fclem): remove multiplication here.
+       * Here only for keeping the size correct for now. */
+      vbo_data[i][3] = radii[i] * 100.0f;
+    }
+  }
+  else {
+    GPU_vertbuf_attr_fill(cache->pos, pos, positions);
+  }
+}
+
+static const float half_octahedron_normals[5][3] = {
+    {0.0f, 0.0f, 1.0f},
+    {1.0f, 0.0f, 0.0f},
+    {0.0f, 1.0f, 0.0f},
+    {-1.0f, 0.0f, 0.0f},
+    {0.0f, -1.0f, 0.0f},
+};
+
+static const uint half_octahedron_tris[4][3] = {
+    {0, 1, 2},
+    {0, 2, 3},
+    {0, 3, 4},
+    {0, 4, 1},
+};
+
+static void pointcloud_batch_cache_ensure_geom(Object *UNUSED(ob), PointCloudBatchCache *cache)
+{
+  if (cache->geom != NULL) {
+    return;
+  }
+
+  static GPUVertFormat format = {0};
+  static uint pos;
+  if (format.attr_len == 0) {
+    /* initialize vertex format */
+    pos = GPU_vertformat_attr_add(&format, "pos_inst", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+    GPU_vertformat_alias_add(&format, "nor");
+  }
+
+  cache->geom = GPU_vertbuf_create_with_format(&format);
+  GPU_vertbuf_data_alloc(cache->geom, ARRAY_SIZE(half_octahedron_normals));
+
+  GPU_vertbuf_attr_fill(cache->geom, pos, half_octahedron_normals);
+
+  GPUIndexBufBuilder builder;
+  GPU_indexbuf_init(&builder,
+                    GPU_PRIM_TRIS,
+                    ARRAY_SIZE(half_octahedron_tris),
+                    ARRAY_SIZE(half_octahedron_normals));
+
+  for (int i = 0; i < ARRAY_SIZE(half_octahedron_tris); i++) {
+    GPU_indexbuf_add_tri_verts(&builder, UNPACK3(half_octahedron_tris[i]));
+  }
+
+  cache->geom_indices = GPU_indexbuf_build(&builder);
+}
+
+GPUBatch *DRW_pointcloud_batch_cache_get_dots(Object *ob)
+{
+  PointCloud *pointcloud = static_cast<PointCloud *>(ob->data);
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+
+  if (cache->dots == NULL) {
+    pointcloud_batch_cache_ensure_pos(ob, cache);
+    cache->dots = GPU_batch_create(GPU_PRIM_POINTS, cache->pos, NULL);
+  }
+
+  return cache->dots;
+}
+
+GPUBatch *DRW_pointcloud_batch_cache_get_surface(Object *ob)
+{
+  PointCloud *pointcloud = static_cast<PointCloud *>(ob->data);
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+
+  if (cache->surface == NULL) {
+    pointcloud_batch_cache_ensure_pos(ob, cache);
+    pointcloud_batch_cache_ensure_geom(ob, cache);
+
+    cache->surface = GPU_batch_create(GPU_PRIM_TRIS, cache->geom, cache->geom_indices);
+    GPU_batch_instbuf_add_ex(cache->surface, cache->pos, false);
+  }
+
+  return cache->surface;
+}
+
+GPUBatch **DRW_cache_pointcloud_surface_shaded_get(Object *ob,
+                                                   struct GPUMaterial **UNUSED(gpumat_array),
+                                                   uint gpumat_array_len)
+{
+  PointCloud *pointcloud = static_cast<PointCloud *>(ob->data);
+  PointCloudBatchCache *cache = pointcloud_batch_cache_get(pointcloud);
+  BLI_assert(cache->mat_len == gpumat_array_len);
+  UNUSED_VARS(gpumat_array_len);
+
+  if (cache->surface_per_mat[0] == NULL) {
+    pointcloud_batch_cache_ensure_pos(ob, cache);
+    pointcloud_batch_cache_ensure_geom(ob, cache);
+
+    cache->surface_per_mat[0] = GPU_batch_create(GPU_PRIM_TRIS, cache->geom, cache->geom_indices);
+    GPU_batch_instbuf_add_ex(cache->surface_per_mat[0], cache->pos, false);
+  }
+
+  return cache->surface_per_mat;
+}
+
+int DRW_pointcloud_material_count_get(PointCloud *pointcloud)
+{
+  return max_ii(1, pointcloud->totcol);
+}