From cb3ba68ec4470a170905a2dc9ea64b8fa1f8ace3 Mon Sep 17 00:00:00 2001
From: Germano Cavalcante <germano.costa@ig.com.br>
Date: Wed, 17 Nov 2021 14:54:14 -0300
Subject: Adjust snap source drawing when adding multiple snap points

---
 .../editors/space_view3d/view3d_cursor_snap.c      | 26 +++++++++++++++-
 source/blender/editors/transform/transform_snap.c  | 36 ++++++++++++++++++++--
 2 files changed, 59 insertions(+), 3 deletions(-)

(limited to 'source/blender/editors')

diff --git a/source/blender/editors/space_view3d/view3d_cursor_snap.c b/source/blender/editors/space_view3d/view3d_cursor_snap.c
index 961b0bd6862..ac80a70011a 100644
--- a/source/blender/editors/space_view3d/view3d_cursor_snap.c
+++ b/source/blender/editors/space_view3d/view3d_cursor_snap.c
@@ -414,13 +414,37 @@ void ED_view3d_cursor_snap_draw_util(RegionView3D *rv3d,
   }
 
   if (loc_prev) {
+    /* Draw an "X" indicating where the previous snap point is.
+     * This is useful for indicating perpendicular snap. */
+
+    /* v1, v2, v3 and v4 indicate the coordinates of the ends of the "X". */
+    float vx[3], vy[3], v1[3], v2[3], v3[3], v4[4];
+
     /* Multiply by 0.75f so that the final size of the "X" is close to that of
      * the circle.
      * (A closer value is 0.7071f, but we don't need to be exact here). */
     float x_size = 0.75f * radius * ED_view3d_pixel_size(rv3d, loc_prev);
 
+    mul_v3_v3fl(vx, view_inv[0], x_size);
+    mul_v3_v3fl(vy, view_inv[1], x_size);
+
+    add_v3_v3v3(v1, vx, vy);
+    sub_v3_v3v3(v2, vx, vy);
+    negate_v3_v3(v3, v1);
+    negate_v3_v3(v4, v2);
+
+    add_v3_v3(v1, loc_prev);
+    add_v3_v3(v2, loc_prev);
+    add_v3_v3(v3, loc_prev);
+    add_v3_v3(v4, loc_prev);
+
     immUniformColor4ubv(color_line);
-    imm_drawX(loc_prev, x_size, view_inv, pos);
+    immBegin(GPU_PRIM_LINES, 4);
+    immVertex3fv(pos, v3);
+    immVertex3fv(pos, v1);
+    immVertex3fv(pos, v4);
+    immVertex3fv(pos, v2);
+    immEnd();
 
     if (loc_curr && (snap_elem_type & SCE_SNAP_MODE_EDGE_PERPENDICULAR)) {
       /* Dashed line. */
diff --git a/source/blender/editors/transform/transform_snap.c b/source/blender/editors/transform/transform_snap.c
index f52061f8910..8ed0a1f2ea8 100644
--- a/source/blender/editors/transform/transform_snap.c
+++ b/source/blender/editors/transform/transform_snap.c
@@ -237,12 +237,44 @@ void drawSnapping(const struct bContext *C, TransInfo *t)
         }
 
         if (t->modifiers & MOD_EDIT_SNAP_SOURCE) {
+          /* Indicate the new snap source position. */
+
           float snap_point[3];
           getSnapPoint(t, snap_point);
 
+          float vx[3], vy[3], v[3];
+          float size_tmp = ED_view3d_pixel_size(rv3d, snap_point) * size;
+          float size_fac = 0.5f;
+
+          mul_v3_v3fl(vx, view_inv[0], size_tmp);
+          mul_v3_v3fl(vy, view_inv[1], size_tmp);
+
           immUniformColor4ubv(col);
-          imm_drawX(
-              snap_point, 0.75f * size * ED_view3d_pixel_size(rv3d, snap_point), view_inv, pos);
+
+          imm_drawcircball(snap_point, size_tmp, view_inv, pos);
+
+          immBegin(GPU_PRIM_LINES, 8);
+          add_v3_v3v3(v, snap_point, vx);
+          immVertex3fv(pos, v);
+          madd_v3_v3fl(v, vx, size_fac);
+          immVertex3fv(pos, v);
+
+          sub_v3_v3v3(v, snap_point, vx);
+          immVertex3fv(pos, v);
+          madd_v3_v3fl(v, vx, -size_fac);
+          immVertex3fv(pos, v);
+
+          add_v3_v3v3(v, snap_point, vy);
+          immVertex3fv(pos, v);
+          madd_v3_v3fl(v, vy, size_fac);
+          immVertex3fv(pos, v);
+
+          sub_v3_v3v3(v, snap_point, vy);
+          immVertex3fv(pos, v);
+          madd_v3_v3fl(v, vy, -size_fac);
+          immVertex3fv(pos, v);
+
+          immEnd();
         }
 
         immUnbindProgram();
-- 
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