diff --git a/intern/opencolorio/gpu_shader_display_transform_frag.glsl b/intern/opencolorio/gpu_shader_display_transform_frag.glsl
index 3c2352c13ba..92cf9b013fd 100644
--- a/intern/opencolorio/gpu_shader_display_transform_frag.glsl
+++ b/intern/opencolorio/gpu_shader_display_transform_frag.glsl
@@ -130,8 +130,10 @@ vec4 apply_dither(vec4 col, vec2 uv)
  * \{ */
 
 /* Prototypes: Implementation is generaterd and defined after. */
+#ifndef GPU_METAL /* Forward declaration invalid in MSL. */
 vec4 OCIO_to_scene_linear(vec4 pixel);
 vec4 OCIO_to_display(vec4 pixel);
+#endif
 
 vec4 OCIO_ProcessColor(vec4 col, vec4 col_overlay)
 {
diff --git a/source/blender/draw/engines/overlay/overlay_armature.cc b/source/blender/draw/engines/overlay/overlay_armature.cc
index 1e10fc7cd20..494fd3739d7 100644
--- a/source/blender/draw/engines/overlay/overlay_armature.cc
+++ b/source/blender/draw/engines/overlay/overlay_armature.cc
@@ -140,11 +140,11 @@ void OVERLAY_armature_cache_init(OVERLAY_Data *vedata)
 
     pd->armature_bone_select_act_grp = grp = DRW_shgroup_create(sh, psl->armature_bone_select_ps);
     float4 color = {0.0f, 0.0f, 0.0f, alpha};
-    DRW_shgroup_uniform_vec4_copy(grp, "color", color);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", color);
 
     pd->armature_bone_select_grp = grp = DRW_shgroup_create(sh, psl->armature_bone_select_ps);
     color = {0.0f, 0.0f, 0.0f, powf(alpha, 4)};
-    DRW_shgroup_uniform_vec4_copy(grp, "color", color);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", color);
   }
 
   for (int i = 0; i < 2; i++) {
diff --git a/source/blender/draw/engines/overlay/overlay_background.cc b/source/blender/draw/engines/overlay/overlay_background.cc
index e8bae74c70a..2442efc033e 100644
--- a/source/blender/draw/engines/overlay/overlay_background.cc
+++ b/source/blender/draw/engines/overlay/overlay_background.cc
@@ -89,7 +89,7 @@ void OVERLAY_background_cache_init(OVERLAY_Data *vedata)
 
     GPUShader *sh = OVERLAY_shader_clipbound();
     DRWShadingGroup *grp = DRW_shgroup_create(sh, psl->clipping_frustum_ps);
-    DRW_shgroup_uniform_vec4_copy(grp, "color", G_draw.block.color_clipping_border);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", G_draw.block.color_clipping_border);
     DRW_shgroup_uniform_vec3(grp, "boundbox", &bb->vec[0][0], 8);
 
     struct GPUBatch *cube = DRW_cache_cube_get();
diff --git a/source/blender/draw/engines/overlay/overlay_edit_text.cc b/source/blender/draw/engines/overlay/overlay_edit_text.cc
index f541619ccdd..ebadaa530e4 100644
--- a/source/blender/draw/engines/overlay/overlay_edit_text.cc
+++ b/source/blender/draw/engines/overlay/overlay_edit_text.cc
@@ -37,7 +37,7 @@ void OVERLAY_edit_text_cache_init(OVERLAY_Data *vedata)
 
     sh = OVERLAY_shader_uniform_color();
     pd->edit_text_wire_grp[i] = grp = DRW_shgroup_create(sh, psl->edit_text_wire_ps[i]);
-    DRW_shgroup_uniform_vec4_copy(grp, "color", G_draw.block.color_wire);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", G_draw.block.color_wire);
   }
   {
     /* Cursor (text caret). */
@@ -45,14 +45,14 @@ void OVERLAY_edit_text_cache_init(OVERLAY_Data *vedata)
     DRW_PASS_CREATE(psl->edit_text_cursor_ps, state | pd->clipping_state);
     sh = OVERLAY_shader_uniform_color();
     pd->edit_text_cursor_grp = grp = DRW_shgroup_create(sh, psl->edit_text_cursor_ps);
-    DRW_shgroup_uniform_vec4(grp, "color", pd->edit_text.cursor_color, 1);
+    DRW_shgroup_uniform_vec4(grp, "ucolor", pd->edit_text.cursor_color, 1);
 
     /* Selection boxes. */
     state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA;
     DRW_PASS_CREATE(psl->edit_text_selection_ps, state | pd->clipping_state);
     sh = OVERLAY_shader_uniform_color();
     pd->edit_text_selection_grp = grp = DRW_shgroup_create(sh, psl->edit_text_selection_ps);
-    DRW_shgroup_uniform_vec4(grp, "color", pd->edit_text.selection_color, 1);
+    DRW_shgroup_uniform_vec4(grp, "ucolor", pd->edit_text.selection_color, 1);
 
     /* Highlight text within selection boxes. */
     state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA | DRW_STATE_DEPTH_GREATER_EQUAL |
diff --git a/source/blender/draw/engines/overlay/overlay_edit_uv.cc b/source/blender/draw/engines/overlay/overlay_edit_uv.cc
index c173201b271..25fa25c611d 100644
--- a/source/blender/draw/engines/overlay/overlay_edit_uv.cc
+++ b/source/blender/draw/engines/overlay/overlay_edit_uv.cc
@@ -116,10 +116,10 @@ void OVERLAY_edit_uv_init(OVERLAY_Data *vedata)
   const bool show_modified_uvs = sima->flag & SI_DRAWSHADOW;
   const bool is_tiled_image = image && (image->source == IMA_SRC_TILED);
   const bool do_edges_only = (ts->uv_flag & UV_SYNC_SELECTION) ?
-                                  /* NOTE: Ignore #SCE_SELECT_EDGE because a single selected edge
-                                   * on the mesh may cause single UV vertices to be selected. */
-                                  false :
-                                  (ts->uv_selectmode == UV_SELECT_EDGE);
+                                 /* NOTE: Ignore #SCE_SELECT_EDGE because a single selected edge
+                                  * on the mesh may cause single UV vertices to be selected. */
+                                 false :
+                                 (ts->uv_selectmode == UV_SELECT_EDGE);
   const bool do_faces = ((sima->flag & SI_NO_DRAWFACES) == 0);
   const bool do_face_dots = (ts->uv_flag & UV_SYNC_SELECTION) ?
                                 (ts->selectmode & SCE_SELECT_FACE) != 0 :
@@ -301,7 +301,7 @@ void OVERLAY_edit_uv_cache_init(OVERLAY_Data *vedata)
     srgb_to_linearrgb_v4(selected_color, selected_color);
 
     DRWShadingGroup *grp = DRW_shgroup_create(sh, psl->edit_uv_tiled_image_borders_ps);
-    DRW_shgroup_uniform_vec4_copy(grp, "color", theme_color);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", theme_color);
     const float3 offset = {0.0f, 0.0f, 0.0f};
     DRW_shgroup_uniform_vec3_copy(grp, "offset", offset);
 
diff --git a/source/blender/draw/engines/overlay/overlay_extra.cc b/source/blender/draw/engines/overlay/overlay_extra.cc
index 3e9855720b3..f0665f7e90f 100644
--- a/source/blender/draw/engines/overlay/overlay_extra.cc
+++ b/source/blender/draw/engines/overlay/overlay_extra.cc
@@ -195,23 +195,23 @@ void OVERLAY_extra_cache_init(OVERLAY_Data *vedata)
       DRW_shgroup_uniform_block(grp, "globalsBlock", G_draw.block_ubo);
 
       grp_sub = DRW_shgroup_create_sub(grp);
-      DRW_shgroup_uniform_vec4_copy(grp_sub, "color", G_draw.block.color_active);
+      DRW_shgroup_uniform_vec4_copy(grp_sub, "ucolor", G_draw.block.color_active);
       cb->center_active = BUF_POINT(grp_sub, format);
 
       grp_sub = DRW_shgroup_create_sub(grp);
-      DRW_shgroup_uniform_vec4_copy(grp_sub, "color", G_draw.block.color_select);
+      DRW_shgroup_uniform_vec4_copy(grp_sub, "ucolor", G_draw.block.color_select);
       cb->center_selected = BUF_POINT(grp_sub, format);
 
       grp_sub = DRW_shgroup_create_sub(grp);
-      DRW_shgroup_uniform_vec4_copy(grp_sub, "color", G_draw.block.color_deselect);
+      DRW_shgroup_uniform_vec4_copy(grp_sub, "ucolor", G_draw.block.color_deselect);
       cb->center_deselected = BUF_POINT(grp_sub, format);
 
       grp_sub = DRW_shgroup_create_sub(grp);
-      DRW_shgroup_uniform_vec4_copy(grp_sub, "color", G_draw.block.color_library_select);
+      DRW_shgroup_uniform_vec4_copy(grp_sub, "ucolor", G_draw.block.color_library_select);
       cb->center_selected_lib = BUF_POINT(grp_sub, format);
 
       grp_sub = DRW_shgroup_create_sub(grp);
-      DRW_shgroup_uniform_vec4_copy(grp_sub, "color", G_draw.block.color_library);
+      DRW_shgroup_uniform_vec4_copy(grp_sub, "ucolor", G_draw.block.color_library);
       cb->center_deselected_lib = BUF_POINT(grp_sub, format);
     }
   }
diff --git a/source/blender/draw/engines/overlay/overlay_fade.cc b/source/blender/draw/engines/overlay/overlay_fade.cc
index 138226c3e2e..ee5540d91eb 100644
--- a/source/blender/draw/engines/overlay/overlay_fade.cc
+++ b/source/blender/draw/engines/overlay/overlay_fade.cc
@@ -36,7 +36,7 @@ void OVERLAY_fade_cache_init(OVERLAY_Data *vedata)
     if (draw_ctx->v3d->shading.background_type == V3D_SHADING_BACKGROUND_THEME) {
       srgb_to_linearrgb_v4(color, color);
     }
-    DRW_shgroup_uniform_vec4_copy(pd->fade_grp[i], "color", color);
+    DRW_shgroup_uniform_vec4_copy(pd->fade_grp[i], "ucolor", color);
   }
 
   if (!pd->use_in_front) {
diff --git a/source/blender/draw/engines/overlay/overlay_grid.cc b/source/blender/draw/engines/overlay/overlay_grid.cc
index 89fc6ec2eb7..d1958205a10 100644
--- a/source/blender/draw/engines/overlay/overlay_grid.cc
+++ b/source/blender/draw/engines/overlay/overlay_grid.cc
@@ -290,7 +290,7 @@ void OVERLAY_grid_cache_init(OVERLAY_Data *ved)
     /* add wire border */
     GPUShader *sh = OVERLAY_shader_grid_image();
     DRWShadingGroup *grp = DRW_shgroup_create(sh, psl->grid_ps);
-    DRW_shgroup_uniform_vec4_copy(grp, "color", theme_color);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", theme_color);
     unit_m4(mat);
     for (int x = 0; x < grid->size[0]; x++) {
       mat[3][0] = x;
diff --git a/source/blender/draw/engines/overlay/overlay_image.cc b/source/blender/draw/engines/overlay/overlay_image.cc
index dff30eed620..47587319098 100644
--- a/source/blender/draw/engines/overlay/overlay_image.cc
+++ b/source/blender/draw/engines/overlay/overlay_image.cc
@@ -349,7 +349,7 @@ void OVERLAY_image_camera_cache_populate(OVERLAY_Data *vedata, Object *ob)
       DRW_shgroup_uniform_bool_copy(grp, "imgAlphaBlend", true);
       DRW_shgroup_uniform_bool_copy(grp, "isCameraBackground", true);
       DRW_shgroup_uniform_bool_copy(grp, "depthSet", true);
-      DRW_shgroup_uniform_vec4_copy(grp, "color", color_premult_alpha);
+      DRW_shgroup_uniform_vec4_copy(grp, "ucolor", color_premult_alpha);
       DRW_shgroup_call_obmat(grp, DRW_cache_quad_get(), mat);
     }
   }
@@ -435,7 +435,7 @@ void OVERLAY_image_empty_cache_populate(OVERLAY_Data *vedata, Object *ob)
     DRW_shgroup_uniform_bool_copy(grp, "imgAlphaBlend", use_alpha_blend);
     DRW_shgroup_uniform_bool_copy(grp, "isCameraBackground", false);
     DRW_shgroup_uniform_bool_copy(grp, "depthSet", depth_mode != OB_EMPTY_IMAGE_DEPTH_DEFAULT);
-    DRW_shgroup_uniform_vec4_copy(grp, "color", ob->color);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", ob->color);
     DRW_shgroup_call_obmat(grp, DRW_cache_quad_get(), mat);
   }
 }
diff --git a/source/blender/draw/engines/overlay/overlay_mode_transfer.cc b/source/blender/draw/engines/overlay/overlay_mode_transfer.cc
index d4bc5655da3..b312a12a07b 100644
--- a/source/blender/draw/engines/overlay/overlay_mode_transfer.cc
+++ b/source/blender/draw/engines/overlay/overlay_mode_transfer.cc
@@ -100,7 +100,7 @@ void OVERLAY_mode_transfer_cache_populate(OVERLAY_Data *vedata, Object *ob)
     UI_GetThemeColor3fv(TH_VERTEX_SELECT, color);
     color[3] = mode_transfer_alpha_for_animation_time_get(animation_time);
     srgb_to_linearrgb_v4(color, color);
-    DRW_shgroup_uniform_vec4_copy(mode_transfer_grp[i], "color", color);
+    DRW_shgroup_uniform_vec4_copy(mode_transfer_grp[i], "ucolor", color);
   }
 
   if (!pd->use_in_front) {
diff --git a/source/blender/draw/engines/overlay/overlay_paint.cc b/source/blender/draw/engines/overlay/overlay_paint.cc
index d2573d1db0b..b8f087a1460 100644
--- a/source/blender/draw/engines/overlay/overlay_paint.cc
+++ b/source/blender/draw/engines/overlay/overlay_paint.cc
@@ -168,7 +168,7 @@ void OVERLAY_paint_cache_init(OVERLAY_Data *vedata)
     sh = OVERLAY_shader_paint_face();
     pd->paint_face_grp = grp = DRW_shgroup_create(sh, psl->paint_overlay_ps);
     const float4 color = {1.0f, 1.0f, 1.0f, 0.2f};
-    DRW_shgroup_uniform_vec4_copy(grp, "color", color);
+    DRW_shgroup_uniform_vec4_copy(grp, "ucolor", color);
     DRW_shgroup_state_enable(grp, DRW_STATE_BLEND_ALPHA);
 
     sh = OVERLAY_shader_paint_wire();
diff --git a/source/blender/draw/engines/overlay/shaders/infos/overlay_background_info.hh b/source/blender/draw/engines/overlay/shaders/infos/overlay_background_info.hh
index 88a012c35c9..8bc15400248 100644
--- a/source/blender/draw/engines/overlay/shaders/infos/overlay_background_info.hh
+++ b/source/blender/draw/engines/overlay/shaders/infos/overlay_background_info.hh
@@ -15,7 +15,7 @@ GPU_SHADER_CREATE_INFO(overlay_background)
 
 GPU_SHADER_CREATE_INFO(overlay_clipbound)
     .do_static_compilation(true)
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .push_constant(Type::VEC3, "boundbox", 8)
     .vertex_source("overlay_clipbound_vert.glsl")
     .fragment_out(0, Type::VEC4, "fragColor")
diff --git a/source/blender/draw/engines/overlay/shaders/infos/overlay_edit_mode_info.hh b/source/blender/draw/engines/overlay/shaders/infos/overlay_edit_mode_info.hh
index 92a35a049a4..e2cc0a54153 100644
--- a/source/blender/draw/engines/overlay/shaders/infos/overlay_edit_mode_info.hh
+++ b/source/blender/draw/engines/overlay/shaders/infos/overlay_edit_mode_info.hh
@@ -278,7 +278,7 @@ GPU_SHADER_CREATE_INFO(overlay_edit_uv_verts)
 GPU_SHADER_CREATE_INFO(overlay_edit_uv_tiled_image_borders)
     .do_static_compilation(true)
     .vertex_in(0, Type::VEC3, "pos")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("overlay_edit_uv_tiled_image_borders_vert.glsl")
     .fragment_source("overlay_uniform_color_frag.glsl")
@@ -294,7 +294,7 @@ GPU_SHADER_CREATE_INFO(overlay_edit_uv_stencil_image)
     .sampler(0, ImageType::FLOAT_2D, "imgTexture")
     .push_constant(Type::BOOL, "imgPremultiplied")
     .push_constant(Type::BOOL, "imgAlphaBlend")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .fragment_out(0, Type::VEC4, "fragColor")
     .fragment_source("overlay_image_frag.glsl")
     .additional_info("draw_mesh");
@@ -581,7 +581,7 @@ GPU_SHADER_CREATE_INFO(overlay_depth_only_clipped)
 GPU_SHADER_CREATE_INFO(overlay_uniform_color)
     .do_static_compilation(true)
     .vertex_in(0, Type::VEC3, "pos")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("overlay_depth_only_vert.glsl")
     .fragment_source("overlay_uniform_color_frag.glsl")
diff --git a/source/blender/draw/engines/overlay/shaders/infos/overlay_extra_info.hh b/source/blender/draw/engines/overlay/shaders/infos/overlay_extra_info.hh
index 4ebc83c27b0..65084361f14 100644
--- a/source/blender/draw/engines/overlay/shaders/infos/overlay_extra_info.hh
+++ b/source/blender/draw/engines/overlay/shaders/infos/overlay_extra_info.hh
@@ -145,7 +145,7 @@ GPU_SHADER_CREATE_INFO(overlay_extra_point)
     /* TODO(fclem): Move the vertex shader to Overlay engine and remove this bypass. */
     .define("blender_srgb_to_framebuffer_space(a)", "a")
     .vertex_in(0, Type::VEC3, "pos")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .vertex_out(overlay_extra_point_iface)
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("overlay_extra_point_vert.glsl")
@@ -161,7 +161,7 @@ GPU_SHADER_INTERFACE_INFO(overlay_extra_loose_point_iface, "").smooth(Type::VEC4
 GPU_SHADER_CREATE_INFO(overlay_extra_loose_point)
     .do_static_compilation(true)
     .vertex_in(0, Type::VEC3, "pos")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .vertex_out(overlay_extra_loose_point_iface)
     .fragment_out(0, Type::VEC4, "fragColor")
     .fragment_out(1, Type::VEC4, "lineOutput")
@@ -257,7 +257,7 @@ GPU_SHADER_CREATE_INFO(overlay_image)
     .push_constant(Type::BOOL, "isCameraBackground")
     .push_constant(Type::BOOL, "imgPremultiplied")
     .push_constant(Type::BOOL, "imgAlphaBlend")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .vertex_in(0, Type::VEC3, "pos")
     .vertex_out(overlay_image_iface)
     .sampler(0, ImageType::FLOAT_2D, "imgTexture")
@@ -304,7 +304,7 @@ GPU_SHADER_INTERFACE_INFO(overlay_particle_iface, "").flat(Type::VEC4, "finalCol
 
 GPU_SHADER_CREATE_INFO(overlay_particle)
     .sampler(0, ImageType::FLOAT_1D, "weightTex")
-    .push_constant(Type::VEC4, "color") /* Draw-size packed in alpha. */
+    .push_constant(Type::VEC4, "ucolor") /* Draw-size packed in alpha. */
     .vertex_in(0, Type::VEC3, "part_pos")
     .vertex_in(1, Type::VEC4, "part_rot")
     .vertex_in(2, Type::FLOAT, "part_val")
diff --git a/source/blender/draw/engines/overlay/shaders/infos/overlay_grid_info.hh b/source/blender/draw/engines/overlay/shaders/infos/overlay_grid_info.hh
index a8f1281d53a..70175b7072f 100644
--- a/source/blender/draw/engines/overlay/shaders/infos/overlay_grid_info.hh
+++ b/source/blender/draw/engines/overlay/shaders/infos/overlay_grid_info.hh
@@ -32,7 +32,7 @@ GPU_SHADER_CREATE_INFO(overlay_grid_background)
 GPU_SHADER_CREATE_INFO(overlay_grid_image)
     .do_static_compilation(true)
     .vertex_in(0, Type::VEC3, "pos")
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("overlay_edit_uv_tiled_image_borders_vert.glsl")
     .fragment_source("overlay_uniform_color_frag.glsl")
diff --git a/source/blender/draw/engines/overlay/shaders/infos/overlay_paint_info.hh b/source/blender/draw/engines/overlay/shaders/infos/overlay_paint_info.hh
index 3083d5a463b..08b421de3e6 100644
--- a/source/blender/draw/engines/overlay/shaders/infos/overlay_paint_info.hh
+++ b/source/blender/draw/engines/overlay/shaders/infos/overlay_paint_info.hh
@@ -12,7 +12,7 @@ GPU_SHADER_CREATE_INFO(overlay_paint_face)
     .do_static_compilation(true)
     .vertex_in(0, Type::VEC3, "pos")
     .vertex_in(1, Type::VEC4, "nor") /* Select flag on the 4th component. */
-    .push_constant(Type::VEC4, "color")
+    .push_constant(Type::VEC4, "ucolor")
     .fragment_out(0, Type::VEC4, "fragColor")
     .vertex_source("overlay_paint_face_vert.glsl")
     .fragment_source("overlay_uniform_color_frag.glsl")
diff --git a/source/blender/draw/engines/overlay/shaders/overlay_extra_point_vert.glsl b/source/blender/draw/engines/overlay/shaders/overlay_extra_point_vert.glsl
index de999c241c0..179c3cb6d73 100644
--- a/source/blender/draw/engines/overlay/shaders/overlay_extra_point_vert.glsl
+++ b/source/blender/draw/engines/overlay/shaders/overlay_extra_point_vert.glsl
@@ -16,7 +16,7 @@ void main()
   radii[3] = radius - outline_width - 1.0;
   radii /= sizeObjectCenter;
 
-  fillColor = color;
+  fillColor = ucolor;
   outlineColor = colorOutline;
 
   view_clipping_distances(world_pos);
diff --git a/source/blender/draw/engines/overlay/shaders/overlay_particle_vert.glsl b/source/blender/draw/engines/overlay/shaders/overlay_particle_vert.glsl
index c48e7cce550..48038d0ca17 100644
--- a/source/blender/draw/engines/overlay/shaders/overlay_particle_vert.glsl
+++ b/source/blender/draw/engines/overlay/shaders/overlay_particle_vert.glsl
@@ -16,7 +16,7 @@ vec3 rotate(vec3 vec, vec4 quat)
 void main()
 {
   /* Drawsize packed in alpha. */
-  float draw_size = color.a;
+  float draw_size = ucolor.a;
 
   vec3 world_pos = part_pos;
 
@@ -43,7 +43,7 @@ void main()
     finalColor = vec4(clamp(pos * 10000.0, 0.0, 1.0), 1.0);
   }
   else if (part_val < 0.0) {
-    finalColor = vec4(color.rgb, 1.0);
+    finalColor = vec4(ucolor.rgb, 1.0);
   }
   else {
     finalColor = vec4(texture(weightTex, part_val).rgb, 1.0);
diff --git a/source/blender/draw/engines/overlay/shaders/overlay_uniform_color_frag.glsl b/source/blender/draw/engines/overlay/shaders/overlay_uniform_color_frag.glsl
index e1a4a3602e3..2794481489c 100644
--- a/source/blender/draw/engines/overlay/shaders/overlay_uniform_color_frag.glsl
+++ b/source/blender/draw/engines/overlay/shaders/overlay_uniform_color_frag.glsl
@@ -1,4 +1,4 @@
 void main()
 {
-  fragColor = color;
+  fragColor = ucolor;
 }
diff --git a/source/blender/draw/engines/workbench/shaders/workbench_transparent_accum_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_transparent_accum_frag.glsl
index 213279b1913..32191835668 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_transparent_accum_frag.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_transparent_accum_frag.glsl
@@ -6,7 +6,7 @@
 #pragma BLENDER_REQUIRE(workbench_world_light_lib.glsl)
 
 /* Special function only to be used with calculate_transparent_weight(). */
-float linear_zdepth(float depth, vec4 viewvecs[2], mat4 proj_mat)
+float linear_zdepth(float depth, mat4 proj_mat)
 {
   if (proj_mat[3][3] == 0.0) {
     float d = 2.0 * depth - 1.0;
@@ -14,7 +14,7 @@ float linear_zdepth(float depth, vec4 viewvecs[2], mat4 proj_mat)
   }
   else {
     /* Return depth from near plane. */
-    return depth * viewvecs[1].z;
+    return depth * drw_view.viewvecs[1].z;
   }
 }
 
@@ -24,7 +24,7 @@ float linear_zdepth(float depth, vec4 viewvecs[2], mat4 proj_mat)
  */
 float calculate_transparent_weight(void)
 {
-  float z = linear_zdepth(gl_FragCoord.z, drw_view.viewvecs, drw_view.winmat);
+  float z = linear_zdepth(gl_FragCoord.z, drw_view.winmat);
 #if 0
   /* Eq 10 : Good for surfaces with varying opacity (like particles) */
   float a = min(1.0, alpha * 10.0) + 0.01;
diff --git a/source/blender/draw/intern/shaders/common_smaa_lib.glsl b/source/blender/draw/intern/shaders/common_smaa_lib.glsl
index dbc4c998b34..0c040c9acfe 100644
--- a/source/blender/draw/intern/shaders/common_smaa_lib.glsl
+++ b/source/blender/draw/intern/shaders/common_smaa_lib.glsl
@@ -588,15 +588,18 @@ SamplerState PointSampler
 #  else
 #    define mad(a, b, c) (a * b + c)
 #  endif
-#  define float2 vec2
-#  define float3 vec3
-#  define float4 vec4
-#  define int2 ivec2
-#  define int3 ivec3
-#  define int4 ivec4
-#  define bool2 bvec2
-#  define bool3 bvec3
-#  define bool4 bvec4
+/* NOTE(Metal): Types already natively declared in MSL. */
+#  ifndef GPU_METAL
+#    define float2 vec2
+#    define float3 vec3
+#    define float4 vec4
+#    define int2 ivec2
+#    define int3 ivec3
+#    define int4 ivec4
+#    define bool2 bvec2
+#    define bool3 bvec3
+#    define bool4 bvec4
+#  endif
 #endif
 
 /* clang-format off */
@@ -658,7 +661,14 @@ void SMAAMovc(bool4 cond, inout float4 variable, float4 value)
 /**
  * Edge Detection Vertex Shader
  */
+#  ifdef GPU_METAL
+/* NOTE: Metal API requires explicit address space qualifiers for pointer types.
+ * Arrays in functions are passed as pointers, and thus require explicit address
+ * space. */
+void SMAAEdgeDetectionVS(float2 texcoord, thread float4 *offset)
+#  else
 void SMAAEdgeDetectionVS(float2 texcoord, out float4 offset[3])
+#  endif
 {
   offset[0] = mad(SMAA_RT_METRICS.xyxy, float4(-1.0, 0.0, 0.0, -1.0), texcoord.xyxy);
   offset[1] = mad(SMAA_RT_METRICS.xyxy, float4(1.0, 0.0, 0.0, 1.0), texcoord.xyxy);
@@ -668,7 +678,16 @@ void SMAAEdgeDetectionVS(float2 texcoord, out float4 offset[3])
 /**
  * Blend Weight Calculation Vertex Shader
  */
+#  ifdef GPU_METAL
+/* NOTE: Metal API requires explicit address space qualifiers for pointer types.
+ * Arrays in functions are passed as pointers, and thus require explicit address
+ * space. */
+void SMAABlendingWeightCalculationVS(float2 texcoord,
+                                     thread float2 &pixcoord,
+                                     thread float4 *offset)
+#  else
 void SMAABlendingWeightCalculationVS(float2 texcoord, out float2 pixcoord, out float4 offset[3])
+#  endif
 {
   pixcoord = texcoord * SMAA_RT_METRICS.zw;
 
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl b/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl
index 27740c8d71b..f912bad8a14 100644
--- a/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_3D_polyline_frag.glsl
@@ -7,7 +7,7 @@ void main()
     discard;
   }
 #endif
-  fragColor = interp.color;
+  fragColor = interp.final_color;
   if (lineSmooth) {
     fragColor.a *= clamp((lineWidth + SMOOTH_WIDTH) * 0.5 - abs(interp.smoothline), 0.0, 1.0);
   }
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl b/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl
index 1c824023234..6d23e03c835 100644
--- a/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_3D_polyline_geom.glsl
@@ -18,14 +18,14 @@ vec4 clip_line_point_homogeneous_space(vec4 p, vec4 q)
 void do_vertex(const int i, vec4 pos, vec2 ofs)
 {
 #if defined(UNIFORM)
-  interp_out.color = color;
+  interp_out.final_color = color;
 
 #elif defined(FLAT)
   /* WATCH: Assuming last provoking vertex. */
-  interp_out.color = interp_in[1].color;
+  interp_out.final_color = interp_in[1].final_color;
 
 #elif defined(SMOOTH)
-  interp_out.color = interp_in[i].color;
+  interp_out.final_color = interp_in[i].final_color;
 #endif
 
 #ifdef CLIP
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert.glsl b/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert.glsl
index d4ef3e6142f..5119db2437c 100644
--- a/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_3D_polyline_vert.glsl
@@ -3,7 +3,7 @@ void main()
 {
   gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
 #ifndef UNIFORM
-  interp.color = color;
+  interp.final_color = color;
 #endif
 #ifdef CLIP
   interp.clip = dot(ModelMatrix * vec4(pos, 1.0), ClipPlane);
diff --git a/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh b/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh
index b486674082e..f16dc516bac 100644
--- a/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh
+++ b/source/blender/gpu/shaders/infos/gpu_shader_3D_polyline_info.hh
@@ -9,7 +9,7 @@
 #include "gpu_shader_create_info.hh"
 
 GPU_SHADER_INTERFACE_INFO(gpu_shader_3D_polyline_iface, "interp")
-    .smooth(Type::VEC4, "color")
+    .smooth(Type::VEC4, "final_color")
     .smooth(Type::FLOAT, "clip")
     .no_perspective(Type::FLOAT, "smoothline");