4b88e3dbdd
Small constant trivial referencing objects should be passed by value. Current state of code most likely legacy from the times there was an optional strings. Pull Request: https://projects.blender.org/blender/blender/pulls/138058
407 lines
13 KiB
C++
407 lines
13 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "BKE_attribute.hh"
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#include "BKE_mesh.hh"
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#include "GEO_mesh_primitive_cuboid.hh"
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namespace blender::geometry {
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struct CuboidConfig {
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float3 size;
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int verts_x;
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int verts_y;
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int verts_z;
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int edges_x;
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int edges_y;
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int edges_z;
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int vertex_count;
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int face_count;
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int loop_count;
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CuboidConfig(float3 size, int verts_x, int verts_y, int verts_z)
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: size(size),
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verts_x(verts_x),
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verts_y(verts_y),
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verts_z(verts_z),
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edges_x(verts_x - 1),
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edges_y(verts_y - 1),
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edges_z(verts_z - 1)
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{
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BLI_assert(edges_x > 0 && edges_y > 0 && edges_z > 0);
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this->vertex_count = this->get_vertex_count();
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this->face_count = this->get_face_count();
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this->loop_count = this->face_count * 4;
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}
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private:
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int get_vertex_count()
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{
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const int inner_position_count = (verts_x - 2) * (verts_y - 2) * (verts_z - 2);
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return verts_x * verts_y * verts_z - inner_position_count;
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}
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int get_face_count()
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{
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return 2 * (edges_x * edges_y + edges_y * edges_z + edges_z * edges_x);
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}
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};
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static void calculate_positions(const CuboidConfig &config, MutableSpan<float3> positions)
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{
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const float z_bottom = -config.size.z / 2.0f;
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const float z_delta = config.size.z / config.edges_z;
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const float x_left = -config.size.x / 2.0f;
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const float x_delta = config.size.x / config.edges_x;
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const float y_front = -config.size.y / 2.0f;
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const float y_delta = config.size.y / config.edges_y;
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int vert_index = 0;
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for (const int z : IndexRange(config.verts_z)) {
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if (ELEM(z, 0, config.edges_z)) {
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/* Fill bottom and top. */
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const float z_pos = z_bottom + z_delta * z;
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for (const int y : IndexRange(config.verts_y)) {
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const float y_pos = y_front + y_delta * y;
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for (const int x : IndexRange(config.verts_x)) {
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const float x_pos = x_left + x_delta * x;
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positions[vert_index++] = float3(x_pos, y_pos, z_pos);
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}
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}
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}
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else {
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for (const int y : IndexRange(config.verts_y)) {
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if (ELEM(y, 0, config.edges_y)) {
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/* Fill y-sides. */
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const float y_pos = y_front + y_delta * y;
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const float z_pos = z_bottom + z_delta * z;
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for (const int x : IndexRange(config.verts_x)) {
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const float x_pos = x_left + x_delta * x;
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positions[vert_index++] = float3(x_pos, y_pos, z_pos);
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}
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}
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else {
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/* Fill x-sides. */
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const float x_pos = x_left;
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const float y_pos = y_front + y_delta * y;
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const float z_pos = z_bottom + z_delta * z;
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positions[vert_index++] = float3(x_pos, y_pos, z_pos);
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const float x_pos2 = x_left + x_delta * config.edges_x;
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positions[vert_index++] = float3(x_pos2, y_pos, z_pos);
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}
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}
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}
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}
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}
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/* vert_1 = bottom left, vert_2 = bottom right, vert_3 = top right, vert_4 = top left.
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* Hence they are passed as 1,4,3,2 when calculating faces clockwise, and 1,2,3,4 for
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* anti-clockwise.
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*/
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static void define_quad(MutableSpan<int> corner_verts,
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const int corner,
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const int vert_1,
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const int vert_2,
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const int vert_3,
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const int vert_4)
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{
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corner_verts[corner] = vert_1;
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corner_verts[corner + 1] = vert_2;
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corner_verts[corner + 2] = vert_3;
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corner_verts[corner + 3] = vert_4;
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}
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static void calculate_corner_verts(const CuboidConfig &config, MutableSpan<int> corner_verts)
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{
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int corner = 0;
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/* Number of vertices in an XY cross-section of the cube (barring top and bottom faces). */
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const int xy_cross_section_vert_count = config.verts_x * config.verts_y -
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(config.verts_x - 2) * (config.verts_y - 2);
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/* Calculate faces for Bottom faces. */
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int vert_1_start = 0;
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for ([[maybe_unused]] const int y : IndexRange(config.edges_y)) {
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for (const int x : IndexRange(config.edges_x)) {
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const int vert_1 = vert_1_start + x;
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const int vert_2 = vert_1_start + config.verts_x + x;
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const int vert_3 = vert_2 + 1;
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const int vert_4 = vert_1 + 1;
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define_quad(corner_verts, corner, vert_1, vert_2, vert_3, vert_4);
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corner += 4;
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}
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vert_1_start += config.verts_x;
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}
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/* Calculate faces for Front faces. */
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vert_1_start = 0;
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int vert_2_start = config.verts_x * config.verts_y;
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for ([[maybe_unused]] const int z : IndexRange(config.edges_z)) {
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for (const int x : IndexRange(config.edges_x)) {
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define_quad(corner_verts,
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corner,
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vert_1_start + x,
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vert_1_start + x + 1,
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vert_2_start + x + 1,
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vert_2_start + x);
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corner += 4;
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}
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vert_1_start = vert_2_start;
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vert_2_start += config.verts_x * config.verts_y - (config.verts_x - 2) * (config.verts_y - 2);
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}
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/* Calculate faces for Top faces. */
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vert_1_start = config.verts_x * config.verts_y +
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(config.verts_z - 2) * (config.verts_x * config.verts_y -
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(config.verts_x - 2) * (config.verts_y - 2));
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vert_2_start = vert_1_start + config.verts_x;
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for ([[maybe_unused]] const int y : IndexRange(config.edges_y)) {
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for (const int x : IndexRange(config.edges_x)) {
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define_quad(corner_verts,
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corner,
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vert_1_start + x,
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vert_1_start + x + 1,
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vert_2_start + x + 1,
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vert_2_start + x);
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corner += 4;
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}
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vert_2_start += config.verts_x;
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vert_1_start += config.verts_x;
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}
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/* Calculate faces for Back faces. */
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vert_1_start = config.verts_x * config.edges_y;
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vert_2_start = vert_1_start + xy_cross_section_vert_count;
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for (const int z : IndexRange(config.edges_z)) {
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if (z == (config.edges_z - 1)) {
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vert_2_start += (config.verts_x - 2) * (config.verts_y - 2);
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}
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for (const int x : IndexRange(config.edges_x)) {
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define_quad(corner_verts,
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corner,
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vert_1_start + x,
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vert_2_start + x,
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vert_2_start + x + 1,
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vert_1_start + x + 1);
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corner += 4;
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}
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vert_2_start += xy_cross_section_vert_count;
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vert_1_start += xy_cross_section_vert_count;
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}
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/* Calculate faces for Left faces. */
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vert_1_start = 0;
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vert_2_start = config.verts_x * config.verts_y;
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for (const int z : IndexRange(config.edges_z)) {
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for (const int y : IndexRange(config.edges_y)) {
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int vert_1;
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int vert_2;
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int vert_3;
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int vert_4;
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if (z == 0 || y == 0) {
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vert_1 = vert_1_start + config.verts_x * y;
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vert_4 = vert_1 + config.verts_x;
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}
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else {
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vert_1 = vert_1_start + 2 * y;
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vert_1 += config.verts_x - 2;
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vert_4 = vert_1 + 2;
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}
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if (y == 0 || z == (config.edges_z - 1)) {
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vert_2 = vert_2_start + config.verts_x * y;
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vert_3 = vert_2 + config.verts_x;
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}
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else {
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vert_2 = vert_2_start + 2 * y;
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vert_2 += config.verts_x - 2;
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vert_3 = vert_2 + 2;
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}
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define_quad(corner_verts, corner, vert_1, vert_2, vert_3, vert_4);
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corner += 4;
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}
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if (z == 0) {
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vert_1_start += config.verts_x * config.verts_y;
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}
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else {
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vert_1_start += xy_cross_section_vert_count;
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}
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vert_2_start += xy_cross_section_vert_count;
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}
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/* Calculate faces for Right faces. */
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vert_1_start = config.edges_x;
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vert_2_start = vert_1_start + config.verts_x * config.verts_y;
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for (const int z : IndexRange(config.edges_z)) {
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for (const int y : IndexRange(config.edges_y)) {
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int vert_1 = vert_1_start;
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int vert_2 = vert_2_start;
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int vert_3 = vert_2_start + 2;
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int vert_4 = vert_1 + config.verts_x;
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if (z == 0) {
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vert_1 = vert_1_start + config.verts_x * y;
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vert_4 = vert_1 + config.verts_x;
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}
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else {
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vert_1 = vert_1_start + 2 * y;
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vert_4 = vert_1 + 2;
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}
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if (z == (config.edges_z - 1)) {
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vert_2 = vert_2_start + config.verts_x * y;
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vert_3 = vert_2 + config.verts_x;
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}
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else {
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vert_2 = vert_2_start + 2 * y;
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vert_3 = vert_2 + 2;
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}
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if (y == (config.edges_y - 1)) {
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vert_3 = vert_2 + config.verts_x;
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vert_4 = vert_1 + config.verts_x;
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}
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define_quad(corner_verts, corner, vert_1, vert_4, vert_3, vert_2);
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corner += 4;
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}
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if (z == 0) {
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vert_1_start += config.verts_x * config.verts_y;
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}
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else {
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vert_1_start += xy_cross_section_vert_count;
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}
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vert_2_start += xy_cross_section_vert_count;
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}
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}
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static void calculate_uvs(const CuboidConfig &config, Mesh *mesh, const StringRef uv_id)
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{
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bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
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bke::SpanAttributeWriter uv_attribute = attributes.lookup_or_add_for_write_only_span<float2>(
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uv_id, bke::AttrDomain::Corner);
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MutableSpan<float2> uvs = uv_attribute.span;
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int corner = 0;
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const float x_delta = 0.25f / float(config.edges_x);
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const float y_delta = 0.25f / float(config.edges_y);
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const float z_delta = 0.25f / float(config.edges_z);
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/* Calculate bottom face UVs. */
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for (const int y : IndexRange(config.edges_y)) {
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for (const int x : IndexRange(config.edges_x)) {
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uvs[corner++] = float2(0.25f + x * x_delta, 0.375f - y * y_delta);
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uvs[corner++] = float2(0.25f + x * x_delta, 0.375f - (y + 1) * y_delta);
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uvs[corner++] = float2(0.25f + (x + 1) * x_delta, 0.375f - (y + 1) * y_delta);
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uvs[corner++] = float2(0.25f + (x + 1) * x_delta, 0.375f - y * y_delta);
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}
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}
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/* Calculate front face UVs. */
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for (const int z : IndexRange(config.edges_z)) {
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for (const int x : IndexRange(config.edges_x)) {
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uvs[corner++] = float2(0.25f + x * x_delta, 0.375f + z * z_delta);
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uvs[corner++] = float2(0.25f + (x + 1) * x_delta, 0.375f + z * z_delta);
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uvs[corner++] = float2(0.25f + (x + 1) * x_delta, 0.375f + (z + 1) * z_delta);
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uvs[corner++] = float2(0.25f + x * x_delta, 0.375f + (z + 1) * z_delta);
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}
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}
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/* Calculate top face UVs. */
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for (const int y : IndexRange(config.edges_y)) {
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for (const int x : IndexRange(config.edges_x)) {
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uvs[corner++] = float2(0.25f + x * x_delta, 0.625f + y * y_delta);
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uvs[corner++] = float2(0.25f + (x + 1) * x_delta, 0.625f + y * y_delta);
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uvs[corner++] = float2(0.25f + (x + 1) * x_delta, 0.625f + (y + 1) * y_delta);
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uvs[corner++] = float2(0.25f + x * x_delta, 0.625f + (y + 1) * y_delta);
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}
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}
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/* Calculate back face UVs. */
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for (const int z : IndexRange(config.edges_z)) {
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for (const int x : IndexRange(config.edges_x)) {
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uvs[corner++] = float2(1.0f - x * x_delta, 0.375f + z * z_delta);
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uvs[corner++] = float2(1.0f - x * x_delta, 0.375f + (z + 1) * z_delta);
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uvs[corner++] = float2(1.0f - (x + 1) * x_delta, 0.375f + (z + 1) * z_delta);
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uvs[corner++] = float2(1.0f - (x + 1) * x_delta, 0.375f + z * z_delta);
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}
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}
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/* Calculate left face UVs. */
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for (const int z : IndexRange(config.edges_z)) {
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for (const int y : IndexRange(config.edges_y)) {
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uvs[corner++] = float2(0.25f - y * y_delta, 0.375f + z * z_delta);
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uvs[corner++] = float2(0.25f - y * y_delta, 0.375f + (z + 1) * z_delta);
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uvs[corner++] = float2(0.25f - (y + 1) * y_delta, 0.375f + (z + 1) * z_delta);
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uvs[corner++] = float2(0.25f - (y + 1) * y_delta, 0.375f + z * z_delta);
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}
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}
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/* Calculate right face UVs. */
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for (const int z : IndexRange(config.edges_z)) {
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for (const int y : IndexRange(config.edges_y)) {
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uvs[corner++] = float2(0.50f + y * y_delta, 0.375f + z * z_delta);
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uvs[corner++] = float2(0.50f + (y + 1) * y_delta, 0.375f + z * z_delta);
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uvs[corner++] = float2(0.50f + (y + 1) * y_delta, 0.375f + (z + 1) * z_delta);
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uvs[corner++] = float2(0.50f + y * y_delta, 0.375f + (z + 1) * z_delta);
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}
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}
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uv_attribute.finish();
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}
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Mesh *create_cuboid_mesh(const float3 &size,
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const int verts_x,
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const int verts_y,
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const int verts_z,
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const std::optional<StringRef> uv_id)
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{
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const CuboidConfig config(size, verts_x, verts_y, verts_z);
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Mesh *mesh = BKE_mesh_new_nomain(config.vertex_count, 0, config.face_count, config.loop_count);
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MutableSpan<float3> positions = mesh->vert_positions_for_write();
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MutableSpan<int> corner_verts = mesh->corner_verts_for_write();
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bke::mesh_smooth_set(*mesh, false);
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calculate_positions(config, positions);
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offset_indices::fill_constant_group_size(4, 0, mesh->face_offsets_for_write());
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calculate_corner_verts(config, corner_verts);
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bke::mesh_calc_edges(*mesh, false, false);
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if (uv_id) {
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calculate_uvs(config, mesh, *uv_id);
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}
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const float3 bounds = size * 0.5f;
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mesh->bounds_set_eager({-bounds, bounds});
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mesh->tag_loose_verts_none();
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mesh->tag_overlapping_none();
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return mesh;
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}
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Mesh *create_cuboid_mesh(const float3 &size,
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const int verts_x,
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const int verts_y,
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const int verts_z)
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{
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return create_cuboid_mesh(size, verts_x, verts_y, verts_z, {});
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}
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} // namespace blender::geometry
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