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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BLI_task.hh"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_material.h"
#include "BKE_mesh.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes {
static void calculate_uvs(
Mesh *mesh, Span<float3> positions, Span<MLoop> loops, const float size_x, const float size_y)
{
MutableAttributeAccessor attributes = mesh->attributes_for_write();
SpanAttributeWriter<float2> uv_attribute = attributes.lookup_or_add_for_write_only_span<float2>(
"uv_map", ATTR_DOMAIN_CORNER);
const float dx = (size_x == 0.0f) ? 0.0f : 1.0f / size_x;
const float dy = (size_y == 0.0f) ? 0.0f : 1.0f / size_y;
threading::parallel_for(loops.index_range(), 1024, [&](IndexRange range) {
for (const int i : range) {
const float3 &co = positions[loops[i].v];
uv_attribute.span[i].x = (co.x + size_x * 0.5f) * dx;
uv_attribute.span[i].y = (co.y + size_y * 0.5f) * dy;
}
});
uv_attribute.finish();
}
Mesh *create_grid_mesh(const int verts_x,
const int verts_y,
const float size_x,
const float size_y)
{
BLI_assert(verts_x > 0 && verts_y > 0);
const int edges_x = verts_x - 1;
const int edges_y = verts_y - 1;
Mesh *mesh = BKE_mesh_new_nomain(verts_x * verts_y,
edges_x * verts_y + edges_y * verts_x,
0,
edges_x * edges_y * 4,
edges_x * edges_y);
MutableSpan<float3> positions = mesh->positions_for_write();
MutableSpan<MEdge> edges = mesh->edges_for_write();
MutableSpan<MPoly> polys = mesh->polys_for_write();
MutableSpan<MLoop> loops = mesh->loops_for_write();
{
const float dx = edges_x == 0 ? 0.0f : size_x / edges_x;
const float dy = edges_y == 0 ? 0.0f : size_y / edges_y;
const float x_shift = edges_x / 2.0f;
const float y_shift = edges_y / 2.0f;
threading::parallel_for(IndexRange(verts_x), 512, [&](IndexRange x_range) {
for (const int x : x_range) {
const int y_offset = x * verts_y;
threading::parallel_for(IndexRange(verts_y), 512, [&](IndexRange y_range) {
for (const int y : y_range) {
const int vert_index = y_offset + y;
positions[vert_index].x = (x - x_shift) * dx;
positions[vert_index].y = (y - y_shift) * dy;
positions[vert_index].z = 0.0f;
}
});
}
});
}
const int y_edges_start = 0;
const int x_edges_start = verts_x * edges_y;
const short edge_flag = (edges_x == 0 || edges_y == 0) ? ME_LOOSEEDGE :
ME_EDGEDRAW | ME_EDGERENDER;
/* Build the horizontal edges in the X direction. */
threading::parallel_for(IndexRange(verts_x), 512, [&](IndexRange x_range) {
for (const int x : x_range) {
const int y_vert_offset = x * verts_y;
const int y_edge_offset = y_edges_start + x * edges_y;
threading::parallel_for(IndexRange(edges_y), 512, [&](IndexRange y_range) {
for (const int y : y_range) {
const int vert_index = y_vert_offset + y;
MEdge &edge = edges[y_edge_offset + y];
edge.v1 = vert_index;
edge.v2 = vert_index + 1;
edge.flag = edge_flag;
}
});
}
});
/* Build the vertical edges in the Y direction. */
threading::parallel_for(IndexRange(verts_y), 512, [&](IndexRange y_range) {
for (const int y : y_range) {
const int x_edge_offset = x_edges_start + y * edges_x;
threading::parallel_for(IndexRange(edges_x), 512, [&](IndexRange x_range) {
for (const int x : x_range) {
const int vert_index = x * verts_y + y;
MEdge &edge = edges[x_edge_offset + x];
edge.v1 = vert_index;
edge.v2 = vert_index + verts_y;
edge.flag = edge_flag;
}
});
}
});
threading::parallel_for(IndexRange(edges_x), 512, [&](IndexRange x_range) {
for (const int x : x_range) {
const int y_offset = x * edges_y;
threading::parallel_for(IndexRange(edges_y), 512, [&](IndexRange y_range) {
for (const int y : y_range) {
const int poly_index = y_offset + y;
const int loop_index = poly_index * 4;
MPoly &poly = polys[poly_index];
poly.loopstart = loop_index;
poly.totloop = 4;
const int vert_index = x * verts_y + y;
MLoop &loop_a = loops[loop_index];
loop_a.v = vert_index;
loop_a.e = x_edges_start + edges_x * y + x;
MLoop &loop_b = loops[loop_index + 1];
loop_b.v = vert_index + verts_y;
loop_b.e = y_edges_start + edges_y * (x + 1) + y;
MLoop &loop_c = loops[loop_index + 2];
loop_c.v = vert_index + verts_y + 1;
loop_c.e = x_edges_start + edges_x * (y + 1) + x;
MLoop &loop_d = loops[loop_index + 3];
loop_d.v = vert_index + 1;
loop_d.e = y_edges_start + edges_y * x + y;
}
});
}
});
if (mesh->totpoly != 0) {
calculate_uvs(mesh, positions, loops, size_x, size_y);
}
return mesh;
}
} // namespace blender::nodes
namespace blender::nodes::node_geo_mesh_primitive_grid_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Float>(N_("Size X"))
.default_value(1.0f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.description(N_("Side length of the plane in the X direction"));
b.add_input<decl::Float>(N_("Size Y"))
.default_value(1.0f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.description(N_("Side length of the plane in the Y direction"));
b.add_input<decl::Int>(N_("Vertices X"))
.default_value(3)
.min(2)
.max(1000)
.description(N_("Number of vertices in the X direction"));
b.add_input<decl::Int>(N_("Vertices Y"))
.default_value(3)
.min(2)
.max(1000)
.description(N_("Number of vertices in the Y direction"));
b.add_output<decl::Geometry>(N_("Mesh"));
}
static void node_geo_exec(GeoNodeExecParams params)
{
const float size_x = params.extract_input<float>("Size X");
const float size_y = params.extract_input<float>("Size Y");
const int verts_x = params.extract_input<int>("Vertices X");
const int verts_y = params.extract_input<int>("Vertices Y");
if (verts_x < 1 || verts_y < 1) {
params.set_default_remaining_outputs();
return;
}
Mesh *mesh = create_grid_mesh(verts_x, verts_y, size_x, size_y);
BKE_id_material_eval_ensure_default_slot(&mesh->id);
params.set_output("Mesh", GeometrySet::create_with_mesh(mesh));
}
} // namespace blender::nodes::node_geo_mesh_primitive_grid_cc
void register_node_type_geo_mesh_primitive_grid()
{
namespace file_ns = blender::nodes::node_geo_mesh_primitive_grid_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_MESH_PRIMITIVE_GRID, "Grid", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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