Objects: Eevee and workbench rendering of new Volume, Hair, PointCloud

Only the volume drawing part is really finished and exposed to the user. Hair
plugs into the existing hair rendering code and is fairly straightforward. The
pointcloud drawing is a hack using overlays rather than Eevee and workbench.

The most tricky part for volume rendering is the case where each volume grid
has a different transform, which requires an additional matrix in the shader
and non-trivial logic in Eevee volume drawing. In the common case were all the
transforms match we don't use the additional per-grid matrix in the shader.

Ref T73201, T68981

Differential Revision: https://developer.blender.org/D6955

1 files changed, 13 insertions, 4 deletions

diff --git a/source/blender/gpu/intern/gpu_node_graph.c b/source/blender/gpu/intern/gpu_node_graph.c
index 0d5cc46c0b9..0eb62bf5b2f 100644
--- a/source/blender/gpu/intern/gpu_node_graph.c
+++ b/source/blender/gpu/intern/gpu_node_graph.c
@@ -123,6 +123,10 @@ static void gpu_node_input_link(GPUNode *node, GPUNodeLink *link, const eGPUType
       input->source = GPU_SOURCE_VOLUME_GRID;
       input->volume_grid = link->volume_grid;
       break;
+    case GPU_NODE_LINK_VOLUME_GRID_TRANSFORM:
+      input->source = GPU_SOURCE_VOLUME_GRID_TRANSFORM;
+      input->volume_grid = link->volume_grid;
+      break;
     case GPU_NODE_LINK_ATTR:
       input->source = GPU_SOURCE_ATTR;
       input->attr = link->attr;
@@ -342,6 +346,7 @@ static GPUMaterialVolumeGrid *gpu_node_graph_add_volume_grid(GPUNodeGraph *graph
     grid = MEM_callocN(sizeof(*grid), __func__);
     grid->name = BLI_strdup(name);
     BLI_snprintf(grid->sampler_name, sizeof(grid->sampler_name), "vsamp%d", num_grids);
+    BLI_snprintf(grid->transform_name, sizeof(grid->transform_name), "vtfm%d", num_grids);
     BLI_addtail(&graph->volume_grids, grid);
   }
 
@@ -432,16 +437,20 @@ GPUNodeLink *GPU_volume_grid(GPUMaterial *mat, const char *name)
   link->link_type = GPU_NODE_LINK_VOLUME_GRID;
   link->volume_grid = gpu_node_graph_add_volume_grid(graph, name);
 
+  GPUNodeLink *transform_link = gpu_node_link_create();
+  transform_link->link_type = GPU_NODE_LINK_VOLUME_GRID_TRANSFORM;
+  transform_link->volume_grid = link->volume_grid;
+
   /* Two special cases, where we adjust the output values of smoke grids to
    * bring the into standard range without having to modify the grid values. */
   if (strcmp(name, "color") == 0) {
-    GPU_link(mat, "node_attribute_volume_color", link, &link);
+    GPU_link(mat, "node_attribute_volume_color", link, transform_link, &link);
   }
   else if (strcmp(name, "temperature") == 0) {
-    GPU_link(mat, "node_attribute_volume_temperature", link, &link);
+    GPU_link(mat, "node_attribute_volume_temperature", link, transform_link, &link);
   }
   else {
-    GPU_link(mat, "node_attribute_volume", link, &link);
+    GPU_link(mat, "node_attribute_volume", link, transform_link, &link);
   }
 
   return link;
@@ -590,7 +599,7 @@ static void gpu_inputs_free(ListBase *inputs)
     else if (ELEM(input->source, GPU_SOURCE_TEX, GPU_SOURCE_TEX_TILED_MAPPING)) {
       input->texture->users--;
     }
-    else if (ELEM(input->source, GPU_SOURCE_VOLUME_GRID)) {
+    else if (ELEM(input->source, GPU_SOURCE_VOLUME_GRID, GPU_SOURCE_VOLUME_GRID_TRANSFORM)) {
       input->volume_grid->users--;
     }