1 files changed, 103 insertions, 0 deletions
diff --git a/source/blender/draw/intern/draw_pointcloud.cc b/source/blender/draw/intern/draw_pointcloud.cc
new file mode 100644
index 00000000000..582dc690cee
--- /dev/null
+++ b/source/blender/draw/intern/draw_pointcloud.cc
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2017 Blender Foundation. All rights reserved. */
+
+/** \file
+ * \ingroup draw
+ *
+ * \brief Contains procedural GPU hair drawing methods.
+ */
+
+#include "BLI_string_utils.h"
+#include "BLI_utildefines.h"
+
+#include "DNA_customdata_types.h"
+#include "DNA_pointcloud_types.h"
+
+#include "BKE_curves.hh"
+#include "BKE_geometry_set.hh"
+
+#include "GPU_batch.h"
+#include "GPU_capabilities.h"
+#include "GPU_compute.h"
+#include "GPU_material.h"
+#include "GPU_shader.h"
+#include "GPU_texture.h"
+#include "GPU_vertex_buffer.h"
+
+#include "DRW_gpu_wrapper.hh"
+#include "DRW_render.h"
+
+#include "draw_attributes.h"
+#include "draw_cache_impl.h"
+#include "draw_common.h"
+#include "draw_manager.h"
+#include "draw_pointcloud_private.hh"
+
+static GPUVertBuf *g_dummy_vbo = nullptr;
+
+void DRW_pointcloud_init()
+{
+  if (g_dummy_vbo == nullptr) {
+    /* initialize vertex format */
+    GPUVertFormat format = {0};
+    uint dummy_id = GPU_vertformat_attr_add(&format, "dummy", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
+
+    g_dummy_vbo = GPU_vertbuf_create_with_format_ex(
+        &format, GPU_USAGE_STATIC | GPU_USAGE_FLAG_BUFFER_TEXTURE_ONLY);
+
+    const float vert[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+    GPU_vertbuf_data_alloc(g_dummy_vbo, 1);
+    GPU_vertbuf_attr_fill(g_dummy_vbo, dummy_id, vert);
+  }
+}
+
+DRWShadingGroup *DRW_shgroup_pointcloud_create_sub(Object *object,
+                                                   DRWShadingGroup *shgrp_parent,
+                                                   GPUMaterial *gpu_material)
+{
+  PointCloud &pointcloud = *static_cast<PointCloud *>(object->data);
+
+  DRWShadingGroup *shgrp = DRW_shgroup_create_sub(shgrp_parent);
+
+  /* Fix issue with certain driver not drawing anything if there is no texture bound to
+   * "ac", "au", "u" or "c". */
+  DRW_shgroup_buffer_texture(shgrp, "u", g_dummy_vbo);
+  DRW_shgroup_buffer_texture(shgrp, "au", g_dummy_vbo);
+  DRW_shgroup_buffer_texture(shgrp, "c", g_dummy_vbo);
+  DRW_shgroup_buffer_texture(shgrp, "ac", g_dummy_vbo);
+
+  GPUVertBuf *pos_rad_buf = pointcloud_position_and_radius_get(&pointcloud);
+  DRW_shgroup_buffer_texture(shgrp, "ptcloud_pos_rad_tx", pos_rad_buf);
+
+  if (gpu_material != nullptr) {
+
+    // const DRW_Attributes &attrs = cache->attr_used;
+    // for (int i = 0; i < attrs.num_requests; i++) {
+    //   const DRW_AttributeRequest &request = attrs.requests[i];
+
+    //   char sampler_name[32];
+    //   /* \note reusing curve attribute function. */
+    //   drw_curves_get_attribute_sampler_name(request.attribute_name, sampler_name);
+
+    //   GPUTexture *attribute_buf = DRW_pointcloud_evaluated_attribute(&pointcloud);
+    //   if (!cache->attributes_buf[i]) {
+    //     continue;
+    //   }
+    //   DRW_shgroup_buffer_texture_ref(shgrp, sampler_name, attribute_buf);
+    // }
+
+    /* Only single material supported for now. */
+    GPUBatch **geom = pointcloud_surface_shaded_get(&pointcloud, &gpu_material, 1);
+    DRW_shgroup_call(shgrp, geom[0], object);
+  }
+  else {
+    GPUBatch *geom = pointcloud_surface_get(&pointcloud);
+    DRW_shgroup_call(shgrp, geom, object);
+  }
+  return shgrp;
+}
+
+void DRW_pointcloud_free()
+{
+  GPU_VERTBUF_DISCARD_SAFE(g_dummy_vbo);
+}