medfall

commit 81dbce2d8a5d6112380a3f1747aff281d3e417ae
parent 824c7244d139e2dc8680ce5c22c24415ae730b2e
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Wed Jul 26 19:55:48 +0300

Better dithering again

Diffstat:
shaders/terrain.glsl
 | 
10
+++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/shaders/terrain.glsl b/shaders/terrain.glsl
@@ -1,7 +1,6 @@
 struct VSOut {
 	vec4 view_position;
 	vec3 world_position;
-	vec4 screen_position;
 };
 
 #ifdef VERTEX_SHADER
@@ -17,8 +16,7 @@ layout( std140 ) uniform view {
 void main() {
 	v2f.world_position = position;
 	v2f.view_position = V * vec4( position, 1.0 );
-	v2f.screen_position = P * v2f.view_position;
-	gl_Position = v2f.screen_position;
+	gl_Position = P * v2f.view_position;
 }
 
 #else
@@ -42,7 +40,7 @@ uniform samplerBuffer point_light_colours;
 vec3 noise( vec2 uv ) {
 	vec3 dither = vec3( dot( vec2( 171.0, 231.0 ), uv ) );
 	dither = fract( dither / vec3( 103.0, 71.0, 97.0 ) ) - vec3( 0.5, 0.5, 0.5 );
-	return ( dither / 256.0 ) * 0.375;
+	return ( dither / 256.0 ) * 0.5;
 }
 
 void main() {
@@ -101,9 +99,7 @@ void main() {
 	float fog_distance_bias = 100.0;
 	float fog_t = 1.0 - exp( -fog_strength * max( ( length( v2f.view_position ) - fog_distance_bias ), 0.0 ) );
 
-	vec2 ndc = v2f.screen_position.xy / v2f.screen_position.w;
-	// seems to produce good results even at other resolutions
-	vec3 dither_noise = noise( ndc * vec2( 1920, 1080 ) );
+	vec3 dither_noise = noise( gl_FragCoord.xy );
 
 	colour = vec4( mix( c, fog_colour, fog_t ) + dither_noise, 1.0 );
 }