X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fcommon.glsl;h=35d5a87eafb8bf8c83e8fe877cdf5e90b0a3d724;hb=HEAD;hp=300726dc541c0f7d4cfcdfdcdba9094f4662f242;hpb=857c2db0fb3112b750b618625649d12e13d9ae1a;p=libs%2Fgl.git

diff --git a/shaderlib/common.glsl b/shaderlib/common.glsl
index 300726dc..249cae7c 100644
--- a/shaderlib/common.glsl
+++ b/shaderlib/common.glsl
@@ -1,10 +1,17 @@
 import msp_interface;
 import shadow;
 
+struct AlphaCutoffParams
+{
+	float cutoff;
+	float feather;
+};
+
 layout(set=1) uniform sampler2D normal_map;
 
 layout(constant_id=auto) const bool use_instancing = false;
 layout(constant_id=auto) const bool use_normal_map = false;
+layout(constant_id=auto) const bool use_alpha_cutoff = false;
 
 #pragma MSP stage(vertex)
 virtual vec4 get_vertex_position()
@@ -68,12 +75,6 @@ void main()
 }
 
 #pragma MSP stage(fragment)
-struct IncomingLight
-{
-	vec3 direction;
-	vec3 color;
-};
-
 layout(location=0) out vec4 frag_color;
 
 virtual vec3 get_fragment_normal()
@@ -86,13 +87,17 @@ virtual vec3 get_fragment_normal()
 		return sgn*normalize(world_normal);
 }
 
-virtual IncomingLight get_incoming_light(int index, vec3 world_pos)
+float apply_alpha_cutoff(float alpha, AlphaCutoffParams params)
 {
-	vec4 light_pos = light_sources[index].position;
-	vec3 rel_pos = light_pos.xyz-world_pos*light_pos.w;
-	float d = length(rel_pos);
-	float attenuation = 1.0/dot(vec3(1.0, d, d*d), light_sources[index].attenuation);
-	return IncomingLight(rel_pos/d, light_sources[index].color*attenuation);
+	if(use_alpha_cutoff)
+	{
+		if(alpha<params.cutoff)
+			discard;
+		float limit = min(params.cutoff+params.feather*fwidth(alpha), 1.0);
+		return smoothstep(params.cutoff, limit, alpha);
+	}
+	else
+		return alpha;
 }
 
 vec3 apply_fog(vec3 color)