Added commented code that can be used for depth-independent line width

shaders/draw_shadowmap/fs_shadowmaps_unpackdepth.sc

@@ -0,0 +1,19 @@
+$input v_texcoord0
+
+/*
+ * Copyright 2013-2014 Dario Manesku. All rights reserved.
+ * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
+ */
+
+#include "../common/common.sh"
+SAMPLER2D(s_shadowMap0, 4);
+
+uniform vec4 u_params2;
+#define u_depthValuePow u_params2.x
+
+void main()
+{
+	float depth = unpackRgbaToFloat(texture2D(s_shadowMap0, v_texcoord0) );
+	vec3 rgba = pow(vec3_splat(depth), vec3_splat(u_depthValuePow) );
+	gl_FragColor = vec4(rgba, 1.0);
+}

shaders/draw_shadowmap/varying.def.sc

@@ -0,0 +1,5 @@
+vec2 v_texcoord0   : TEXCOORD0 = vec2(0.0, 0.0);
+
+vec3 a_position  : POSITION;
+vec4 a_normal    : NORMAL;
+vec2 a_texcoord0 : TEXCOORD0;

shaders/draw_shadowmap/vs_shadowmaps_unpackdepth.sc

@@ -0,0 +1,16 @@
+$input a_position, a_texcoord0
+$output v_texcoord0
+
+/*
+ * Copyright 2013-2014 Dario Manesku. All rights reserved.
+ * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+    v_texcoord0 = a_texcoord0;
+}

shaders/lines/vs_lines.sc

@@ -31,6 +31,10 @@ void main()
 	vec2 next_screen = next_proj.xy / next_proj.w * aspect_vec;
 
 	float len = thickness;
+	// uncomment the following line to get a line width
+	// independent of distance to screen.
+	// len *= current_proj.w;
+
 	float orientation = direction;
 
 	vec2 dir = vec2(0.0);