X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fshadow.glsl;h=d6e2b385f8955009abf737d998fbe7dd984f8996;hb=54fdd850d1e657bc357d859a532497905ded741a;hp=2fa1fd81686c832f3ce78463467500966c092a8e;hpb=bace0b24414abc7b3ba46df3a9fd7408d7479a5e;p=libs%2Fgl.git

diff --git a/shaderlib/shadow.glsl b/shaderlib/shadow.glsl
index 2fa1fd81..d6e2b385 100644
--- a/shaderlib/shadow.glsl
+++ b/shaderlib/shadow.glsl
@@ -6,12 +6,13 @@ struct ShadowParameters
 	float darkness;
 	int matrix_index;
 	vec4 region;
+	vec2 bias;
 };
 
 uniform ShadowMap
 {
 	ShadowParameters shadows[max_lights];
-	mat4 shd_world_matrix[max_lights];
+	mat4 shd_world_matrix[max_lights*4];
 };
 
 uniform sampler2DShadow shadow_map;
@@ -26,7 +27,24 @@ virtual float get_shadow_factor(int index, vec4 world_pos)
 		int type = shadows[index].type;
 		vec3 shadow_coord;
 		if(type==1)
+		{
 			shadow_coord = (shd_world_matrix[shadows[index].matrix_index]*world_pos).xyz;
+			shadow_coord.z -= shadows[index].bias.x;
+		}
+		else if(type==2)
+		{
+			int base = shadows[index].matrix_index;
+			vec4 clip_coord = shd_world_matrix[base]*world_pos;
+			for(int i=1; i<4; ++i)
+			{
+				vec4 c = shd_world_matrix[base+i]*world_pos;
+				if(c.w>clip_coord.w)
+					clip_coord = c;
+			}
+			shadow_coord = clip_coord.xyz/clip_coord.w;
+			vec2 bias = shadows[index].bias;
+			shadow_coord.z = (shadow_coord.z+bias.x)/bias.y-bias.x;
+		}
 		else
 			return 1.0;
 
@@ -34,7 +52,7 @@ virtual float get_shadow_factor(int index, vec4 world_pos)
 			return 1.0;
 
 		vec4 region = shadows[index].region;
-		float shadow_sample = texture(shadow_map, shadow_coord*vec3(region.zw, 1.0)+vec3(region.xy, 0.0));
+		float shadow_sample = texture(shadow_map, vec3(shadow_coord.xy*region.zw+region.xy, shadow_coord.z));
 		return mix(1.0, shadow_sample, shadows[index].darkness);
 	}
 	else