X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Foccluder.glsl;h=a4d876ecef40062decfb2cb255b0200980ed3413;hb=HEAD;hp=b5d05f09ad25dee7b98563dac8564dd0ff98bb82;hpb=57588abbefc8f0162332ac2310c69b62a14b2404;p=libs%2Fgl.git

diff --git a/shaderlib/occluder.glsl b/shaderlib/occluder.glsl
index b5d05f09..a4d876ec 100644
--- a/shaderlib/occluder.glsl
+++ b/shaderlib/occluder.glsl
@@ -1,5 +1,15 @@
 import msp_interface;
 
+layout(set=1) uniform AlphaCutoff
+{
+	float alpha_cutoff;
+};
+
+layout(set=1) uniform sampler2D alpha_map;
+
+layout(constant_id=auto) const bool use_alpha_cutoff = false;
+layout(constant_id=auto) const bool use_instancing = false;
+
 #pragma MSP stage(vertex)
 virtual vec4 get_vertex_position()
 {
@@ -8,7 +18,10 @@ virtual vec4 get_vertex_position()
 
 virtual mat4 get_vertex_transform()
 {
-	return world_obj_matrix;
+	if(use_instancing)
+		return transpose(mat4(instance_transform[0], instance_transform[1], instance_transform[2], vec4(0.0, 0.0, 0.0, 1.0)));
+	else
+		return world_obj_matrix;
 }
 
 virtual void clipping(vec3 eye_vertex)
@@ -20,4 +33,19 @@ void main()
 	vec4 eye_vertex = eye_world_matrix*get_vertex_transform()*get_vertex_position();
 	clipping(eye_vertex.xyz);
 	gl_Position = clip_eye_matrix*eye_vertex;
+	passthrough;
+}
+
+#pragma MSP stage(fragment)
+layout(location=0) out vec4 frag_color;
+
+void main()
+{
+	if(use_alpha_cutoff)
+	{
+		float alpha = texture(alpha_map, texcoord.xy).a;
+		if(alpha<alpha_cutoff)
+			discard;
+		frag_color = vec4(1.0);
+	}
 }