medfall

commit 37f174aa62fbc3ccf91199d27ec261d215782e32
parent 345d8d422bdd1ffe02ea7cb69c3f6f21679be295
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Sun May  7 23:43:15 +0300

PCF

Diffstat:
shadow_map.cc
 | 
17
++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/shadow_map.cc b/shadow_map.cc
@@ -129,15 +129,26 @@ static const char * shadow_frag_src = GLSL(
 
 		vec3 light_ndc = smooth_light_position.xyz / smooth_light_position.w;
 		vec3 light_norm = light_ndc * 0.5 + 0.5;
-		float shadow_depth = texture( shadowmap, light_norm.xy ).r;
-		float point_depth = light_norm.z;
 		float bias2 = max( bias * ( 1.0 + dot( lightdir, frag_normal ) ), bias / 100 );
-		float shadow = point_depth - bias2 <= shadow_depth ? 1.0 : 0.1;
+		float shadow = 0.1;
+
 		if( light_norm.z > 1.0 ) {
 			shadow = 1.0;
 		}
+		else {
+			for( int x = -1; x <= 1; x++ ) {
+				for( int y = -1; y <= 1; y++ ) {
+					vec2 offset = vec2( x * 1.0 / 1024.0, y * 1.0 / 1024.0 );
+					float shadow_depth = texture( shadowmap, light_norm.xy + offset ).r;
+					if( light_norm.z - bias2 <= shadow_depth ) {
+						shadow += 0.1;
+					}
+				}
+			}
+		}
 
 		screen_colour = vec4( frag_colour * light_colour * lambert * shadow, 1.0 );
+		// screen_colour = screen_colour * 0 + vec4( ( frag_normal + 1.0 ) / 2.0, 1 );
 	}
 );