Fix T63846: In Orthographic View, unconfirmed Grease Pencil strokes do not appear in front of Reference Images

In orthographic, the z-depth was wrong.

3 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/draw/engines/gpencil/shaders/gpencil_fill_frag.glsl b/source/blender/draw/engines/gpencil/shaders/gpencil_fill_frag.glsl
index 632c63a39aa..68671a00337 100644
--- a/source/blender/draw/engines/gpencil/shaders/gpencil_fill_frag.glsl
+++ b/source/blender/draw/engines/gpencil/shaders/gpencil_fill_frag.glsl
@@ -177,7 +177,7 @@ void main()
 
   /* set zdepth */
   if (xraymode == GP_XRAY_FRONT) {
-    gl_FragDepth = 0.000001;
+    gl_FragDepth = min(0.000001, (gl_FragCoord.z / gl_FragCoord.w));
   }
   else if (xraymode == GP_XRAY_3DSPACE) {
     /* if 3D mode, move slightly the fill to avoid z-fighting between stroke and fill on same stroke */
diff --git a/source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl b/source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl
index 2fb48ac5147..a80598d9b63 100644
--- a/source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl
+++ b/source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl
@@ -31,7 +31,7 @@ vec2 toScreenSpace(vec4 vertex)
 float getZdepth(vec4 point)
 {
   if (xraymode == GP_XRAY_FRONT) {
-    return 0.000001;
+    return min(0.000001, (point.z / point.w));
   }
   if (xraymode == GP_XRAY_3DSPACE) {
     return (point.z / point.w);
diff --git a/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl b/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl
index 7e62d6f0d64..20b066019c8 100644
--- a/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl
+++ b/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl
@@ -35,7 +35,7 @@ vec2 toScreenSpace(vec4 vertex)
 float getZdepth(vec4 point)
 {
   if (xraymode == GP_XRAY_FRONT) {
-    return 0.000001;
+    return min(0.000001, (point.z / point.w));
   }
   if (xraymode == GP_XRAY_3DSPACE) {
     return (point.z / point.w);