Overlay Engine: Armature: Use Wire AA on custom bone loose edges

source/blender/draw/CMakeLists.txt

@@ -317,6 +317,7 @@ data_to_c_simple(engines/overlay/shaders/armature_shape_outline_geom.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_shape_outline_vert.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_shape_solid_frag.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_shape_solid_vert.glsl SRC)
+data_to_c_simple(engines/overlay/shaders/armature_shape_wire_vert.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_sphere_outline_vert.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_sphere_solid_frag.glsl SRC)
 data_to_c_simple(engines/overlay/shaders/armature_sphere_solid_vert.glsl SRC)

source/blender/draw/engines/overlay/overlay_armature.c

@@ -223,6 +223,11 @@ void OVERLAY_armature_cache_init(OVERLAY_Data *vedata)
       DRW_shgroup_uniform_block_persistent(grp, "globalsBlock", G_draw.block_ubo);
       cb->box_outline = BUF_INSTANCE(grp, format, DRW_cache_bone_box_wire_get());
       cb->octa_outline = BUF_INSTANCE(grp, format, DRW_cache_bone_octahedral_wire_get());
+
+      sh = OVERLAY_shader_armature_shape_wire();
+      cb->custom_wire = grp = DRW_shgroup_create(sh, armature_ps);
+      DRW_shgroup_state_disable(grp, DRW_STATE_BLEND_ALPHA);
+      DRW_shgroup_uniform_block_persistent(grp, "globalsBlock", G_draw.block_ubo);
     }
     {
       format = formats->instance_extra;
@@ -2205,7 +2210,7 @@ static void armature_context_setup(ArmatureDrawContext *ctx,
   ctx->point_outline = cb->point_outline;
   ctx->custom_solid = (is_filled) ? cb->custom_solid : NULL;
   ctx->custom_outline = cb->custom_outline;
-  ctx->custom_wire = cb->custom_solid; /* Use same shader. */
+  ctx->custom_wire = cb->custom_wire;
   ctx->custom_shapes_ghash = cb->custom_shapes_ghash;
   ctx->transparent = pd->armature.transparent;
   ctx->show_relations = pd->armature.show_relations;

source/blender/draw/engines/overlay/overlay_private.h

@@ -197,6 +197,7 @@ typedef struct OVERLAY_ArmatureCallBuffers {
 
   DRWShadingGroup *custom_solid;
   DRWShadingGroup *custom_outline;
+  DRWShadingGroup *custom_wire;
   GHash *custom_shapes_ghash;
 } OVERLAY_ArmatureCallBuffers;
 
@@ -520,6 +521,7 @@ GPUShader *OVERLAY_shader_antialiasing(void);
 GPUShader *OVERLAY_shader_armature_degrees_of_freedom(void);
 GPUShader *OVERLAY_shader_armature_envelope(bool use_outline);
 GPUShader *OVERLAY_shader_armature_shape(bool use_outline);
+GPUShader *OVERLAY_shader_armature_shape_wire(void);
 GPUShader *OVERLAY_shader_armature_sphere(bool use_outline);
 GPUShader *OVERLAY_shader_armature_stick(void);
 GPUShader *OVERLAY_shader_armature_wire(void);

source/blender/draw/engines/overlay/overlay_shader.c

@@ -39,6 +39,7 @@ extern char datatoc_armature_shape_outline_geom_glsl[];
 extern char datatoc_armature_shape_outline_vert_glsl[];
 extern char datatoc_armature_shape_solid_frag_glsl[];
 extern char datatoc_armature_shape_solid_vert_glsl[];
+extern char datatoc_armature_shape_wire_vert_glsl[];
 extern char datatoc_armature_sphere_outline_vert_glsl[];
 extern char datatoc_armature_sphere_solid_frag_glsl[];
 extern char datatoc_armature_sphere_solid_vert_glsl[];
@@ -123,6 +124,7 @@ typedef struct OVERLAY_Shaders {
   GPUShader *armature_envelope_solid;
   GPUShader *armature_shape_outline;
   GPUShader *armature_shape_solid;
+  GPUShader *armature_shape_wire;
   GPUShader *armature_sphere_outline;
   GPUShader *armature_sphere_solid;
   GPUShader *armature_stick;
@@ -353,6 +355,26 @@ GPUShader *OVERLAY_shader_armature_shape(bool use_outline)
   return use_outline ? sh_data->armature_shape_outline : sh_data->armature_shape_solid;
 }
 
+GPUShader *OVERLAY_shader_armature_shape_wire(void)
+{
+  const DRWContextState *draw_ctx = DRW_context_state_get();
+  const GPUShaderConfigData *sh_cfg = &GPU_shader_cfg_data[draw_ctx->sh_cfg];
+  OVERLAY_Shaders *sh_data = &e_data.sh_data[draw_ctx->sh_cfg];
+  if (!sh_data->armature_shape_wire) {
+    sh_data->armature_shape_wire = GPU_shader_create_from_arrays({
+        .vert = (const char *[]){sh_cfg->lib,
+                                 datatoc_common_globals_lib_glsl,
+                                 datatoc_common_view_lib_glsl,
+                                 datatoc_armature_shape_wire_vert_glsl,
+                                 NULL},
+        .frag =
+            (const char *[]){datatoc_common_view_lib_glsl, datatoc_armature_wire_frag_glsl, NULL},
+        .defs = (const char *[]){sh_cfg->def, NULL},
+    });
+  }
+  return sh_data->armature_shape_wire;
+}
+
 GPUShader *OVERLAY_shader_armature_envelope(bool use_outline)
 {
   const DRWContextState *draw_ctx = DRW_context_state_get();

source/blender/draw/engines/overlay/shaders/armature_shape_wire_vert.glsl

@@ -0,0 +1,29 @@
+
+/* ---- Instantiated Attrs ---- */
+in vec3 pos;
+in vec3 nor;
+
+/* ---- Per instance Attrs ---- */
+in mat4 inst_obmat;
+
+out vec4 finalColor;
+flat out vec2 edgeStart;
+noperspective out vec2 edgePos;
+
+void main()
+{
+  vec4 bone_color, state_color;
+  mat4 model_mat = extract_matrix_packed_data(inst_obmat, state_color, bone_color);
+
+  vec3 world_pos = (model_mat * vec4(pos, 1.0)).xyz;
+  gl_Position = point_world_to_ndc(world_pos);
+
+  finalColor.rgb = mix(state_color.rgb, bone_color.rgb, 0.5);
+  finalColor.a = 1.0;
+
+  edgeStart = edgePos = ((gl_Position.xy / gl_Position.w) * 0.5 + 0.5) * sizeViewport.xy;
+
+#ifdef USE_WORLD_CLIP_PLANES
+  world_clip_planes_calc_clip_distance(world_pos);
+#endif
+}