DRW: Fix crash on startup for old Nvidia drivers

This should fix T57296 once and for all.

2 files changed, 4 insertions, 5 deletions

diff --git a/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl b/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl
index d6bcffb12c6..f1ebb419d60 100644
--- a/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl
+++ b/source/blender/draw/modes/shaders/edit_mesh_overlay_vert.glsl
@@ -63,8 +63,7 @@ void main()
 
 	int v_0 = (gl_VertexID / 3) * 3;
 	int vidx = gl_VertexID % 3;
-	barycentric = vec3(0.0);
-	barycentric[vidx] = 1.0;
+	barycentric = vec3(equal(ivec3(0, 1, 2), ivec3(vidx)));
 
 	/* Edge */
 	ivec4 vData[3], data = ivec4(0);
diff --git a/source/blender/draw/modes/shaders/overlay_face_wireframe_vert.glsl b/source/blender/draw/modes/shaders/overlay_face_wireframe_vert.glsl
index 460bed14a8b..b472ab43666 100644
--- a/source/blender/draw/modes/shaders/overlay_face_wireframe_vert.glsl
+++ b/source/blender/draw/modes/shaders/overlay_face_wireframe_vert.glsl
@@ -139,9 +139,9 @@ void main()
 	pos[v_n] = get_vertex_pos(v_id[v_n]);
 	gl_Position = p_pos[v_n] = ModelViewProjectionMatrix * vec4(pos[v_n], 1.0);
 
-	barycentric[v_n] = do_edge[v_n] ? 0.0 : 1.0;
-	barycentric[v_n1] = 1.0;
-	barycentric[v_n2] = do_edge[v_n2] ? 0.0 : 1.0;
+	bvec3 bary = equal(ivec3(0, 1, 2), ivec3(v_n1));
+	/* This is equivalent to component wise : (do_edge ? bary : 1.0) */
+	barycentric = vec3(lessThanEqual(ivec3(do_edge), ivec3(bary)));
 
 #  ifndef LIGHT_EDGES
 	vec3 nor = get_vertex_nor(v_id[v_n]);