1 files changed, 32 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_line_dashed_vert.glsl b/source/blender/gpu/shaders/gpu_shader_3D_line_dashed_vert.glsl
new file mode 100644
index 00000000000..f3e91b6cc03
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_3D_line_dashed_vert.glsl
@@ -0,0 +1,32 @@
+
+/* Note: nearly the same code as for 2D version... Maybe we could deduplicate? */
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform vec2 viewport_size;
+
+#if __VERSION__ == 120
+  attribute vec3 pos;
+  attribute vec3 line_origin; // = pos for one vertex of the line
+  noperspective varying float distance_along_line;
+#else
+  in vec3 pos;
+  in vec3 line_origin;
+  noperspective out float distance_along_line;
+#endif
+
+void main()
+{
+	gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
+
+	vec4 point = ModelViewProjectionMatrix * vec4(line_origin, 1.0);
+	vec2 ref_point = (point.xy / point.w) * 0.5 + 0.5;  // <- device coordinates in [0..1] range.
+	ref_point = ref_point * viewport_size;  // <- fragment coordinates.
+
+	vec2 curr_point = (gl_Position.xy / gl_Position.w) * 0.5 + 0.5;  // <- device coordinates in [0..1] range.
+	curr_point = curr_point * viewport_size;  // <- fragment coordinates.
+
+	distance_along_line = distance(ref_point, curr_point);
+
+	/* Note: we could also use similar approach as diag_stripes_frag, but this would give us dashed 'anchored'
+	 * to the screen, and not to one end of the line... */
+}