Curves: Bezier handles for new Curves

To have "Fix #119247: Curves: Extra point in evaluated spline of Curves geometry" in branch.

@@ -48,1 +51,4 @@
+#define COLOR_SHIFT 5
+
 /* ---------------------------------------------------------------------- */
+struct CurvesUboStorage {

@@ -59,1 +69,4 @@
 
+  GPUVertBuf *edit_points_data;
+
+  GPUUniformBuf *curvess_ubo_storage;

@@ -249,2 +278,3 @@
   if (format_pos.attr_len == 0) {
-    pos = GPU_vertformat_attr_add(&format_pos, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+    GPU_vertformat_attr_add(&format_pos, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+    GPU_vertformat_attr_add(&format_data, "data", GPU_COMP_U32, 1, GPU_FETCH_INT);

@@ -256,0 +331,4 @@
+        for (const int point : curve_points) {
+          const int handle_index = point - curve_points.start() + handle_offset;
+
+          left_handles[handle_index] = math::transform_point(deformation.deform_mats[point],

@@ -268,2 +365,2 @@
-  MutableSpan<float> data(static_cast<float *>(GPU_vertbuf_get_data(cache.edit_points_selection)),
-                          curves.points_num());
+  GPU_vertbuf_data_alloc(cache.edit_points_selection, vert_count);
+  float *buffer_data = static_cast<float *>(GPU_vertbuf_get_data(cache.edit_points_selection));

@@ -274,0 +383,4 @@
+
+  int left_handle_offset = curves.points_num();
+
+  for (const int curve : curves.curves_range()) {

@@ -343,3 +501,1 @@
-   * the Blender convention, it should be `vec4(s, s, s, 1)`. This could be resolved using a
-   * similar texture state swizzle to map the attribute correctly as for volume attributes, so we
-   * can control the conversion ourselves. */
+  /* TODO(@kevindietrich): float4 is used for scalar attributes as the implicit conversion

@@ -66,0 +68,4 @@
+    sh = OVERLAY_shader_edit_curves_handle();
+    grp = pd->edit_curves_handles_grp = DRW_shgroup_create(sh, psl->edit_curves_handles_ps);
+    DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
+    DRW_shgroup_uniform_bool_copy(grp, "useWeight", false);

@@ -0,0 +1,8 @@
+/* SPDX-FileCopyrightText: 2022 Blender Authors

@@ -0,0 +8,4 @@
+float4 get_bezier_handle_color(uint color_id, float sel)
+{
+  switch (color_id) {
+    case 0u:  // BEZIER_HANDLE_FREE

@@ -45,22 +48,39 @@
 
 namespace blender::draw {
 
+#define NURBS_CONTROL_POINT (1u << 1)

@@ -47,1 +50,4 @@
 
+#define NURBS_CONTROL_POINT (1u << 1)
+#define BEZIER_HANDLE (1u << 3)
+#define COLOR_SHIFT 5

@@ -59,1 +71,4 @@
 
+  GPUVertBuf *edit_points_data;
+
+  GPUUniformBuf *curves_ubo_storage;

@@ -264,0 +287,4 @@
+  return bezier_data_value(handle_type, handle_type);
+}
+
+static void curves_batch_cache_ensure_edit_points_pos(

@@ -264,0 +291,4 @@
+    const bke::CurvesGeometry &curves,
+    const IndexMask bezier_curves,
+    const OffsetIndices<int> bezier_dst_offsets,
+    bke::crazyspace::GeometryDeformation deformation,

@@ -264,0 +297,4 @@
+  static GPUVertFormat format_pos = single_attr_vertbuffer_format(
+      "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+  static GPUVertFormat format_data = single_attr_vertbuffer_format(
+      "data", GPU_COMP_U32, 1, GPU_FETCH_INT);

@@ -264,0 +312,4 @@
+  uint32_t *data_buffer_data = static_cast<uint32_t *>(
+      GPU_vertbuf_get_data(cache.edit_points_data));
+
+  MutableSpan<float3> pos_span(pos_buffer_data, deformed_positions.size());

@@ -264,0 +329,4 @@
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+
+  auto handle_other_curves = [&](const uint32_t fill_value) {
+    return [=](const IndexMask &selection) {

@@ -266,0 +368,4 @@
+      pos_buffer_data + deformed_positions.size() + bezier_point_count, bezier_point_count);
+
+  array_utils::gather_group_to_group(
+      points_by_curve, bezier_dst_offsets, bezier_curves, left_handle_positions, left_handles);

@@ -274,0 +398,4 @@
+  }
+
+  const VArray<float> attribute_left = *curves.attributes().lookup_or_default<float>(
+      ".selection_handle_left", bke::AttrDomain::Point, 0.0f);

@@ -716,0 +943,4 @@
+  static struct {
+    uint pos;
+  } attr_id;
+  static GPUVertFormat format = [&]() {

@@ -0,0 +4,4 @@
+
+void main()
+{
+  fragColor = gl_PrimitiveID < curvesInfoBlock[0] ? leftColor : finalColor;

@@ -264,0 +323,4 @@
+  GPU_vertbuf_data_alloc(cache.edit_points_data, size);
+
+  float3 *pos_buffer_data = static_cast<float3 *>(GPU_vertbuf_get_data(cache.edit_points_pos));
+  uint32_t *data_buffer_data = static_cast<uint32_t *>(

@@ -60,0 +83,4 @@
+   */
+  GPUVertBuf *edit_points_data;
+
+  /* Buffer used to store CurvesUboStorage value.  push_constant() could not be used for this

@@ -284,0 +452,4 @@
+  const int index_len_for_nurbs = nurbs_offsets.total_size() + nurbs_curves.size() +
+                                  array_utils::count_booleans(cyclic, nurbs_curves);
+  const int index_len = index_len_for_bezier_handles + index_len_for_nurbs;
+  GPUIndexBufBuilder elb, right_elb;