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Add optional shadow filtering

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This commit is contained in:
Frederic Bouvier 2012-04-18 09:13:38 +02:00
parent 9807be4f0d
commit adf766aeff
3 changed files with 31 additions and 24 deletions
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8
Effects/sunlight.eff
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@ -1,6 +1,9 @@
<?xml version="1.0" encoding="utf-8"?>
<PropertyList>
<name>Effects/sunlight</name>
<parameters>
<filtering><use>/sim/rendering/shadows/filtering</use></filtering>
</parameters>
<technique n="10">
<predicate>
<property>/sim/rendering/shadows/enabled</property>
@ -68,6 +71,11 @@
<type>sampler-2d</type>
<value type="int">4</value>
</uniform>
<uniform>
<name>filtering</name>
<type>int</type>
<value type="int"><use>filtering</use></value>
</uniform>
<!-- The following uniforms are automatically defined and initialized :
- fg_SunAmbientColor
- fg_SunDiffuseColor

24
Shaders/sunlight.frag
View file

@ -10,6 +10,7 @@ uniform vec3 fg_SunDirection;
uniform vec3 fg_Planes;
uniform int fg_ShadowNumber;
uniform vec4 fg_ShadowDistances;
uniform int filtering;
varying vec3 ray;
vec3 position( vec3 viewdir, float depth );
@ -60,26 +61,23 @@ void main() {
vec3 pos = position( viewDir, texture2D( depth_tex, coords ).r );
vec4 tint;
#if 0
float shadow = 1.0;
#elif 1
float shadow = shadow2DProj( shadow_tex, DynamicShadow( vec4( pos, 1.0 ), tint ) ).r;
#elif 0
float shadow = 0.0;
if (filtering == 1) {
shadow = shadow2DProj( shadow_tex, DynamicShadow( vec4( pos, 1.0 ), tint ) ).r;
} else if (filtering == 2) {
shadow += 0.333 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos, 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3(-0.003 * pos.z, -0.003 * pos.z, 0), 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3( 0.003 * pos.z, 0.003 * pos.z, 0), 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3(-0.003 * pos.z, 0.003 * pos.z, 0), 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3( 0.003 * pos.z, -0.003 * pos.z, 0), 1.0), tint ) ).r;
#else
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3(-0.003 * pos.z, -0.002 * pos.z, 0), 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3( 0.003 * pos.z, 0.002 * pos.z, 0), 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3(-0.003 * pos.z, 0.002 * pos.z, 0), 1.0), tint ) ).r;
shadow += 0.166 * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3( 0.003 * pos.z, -0.002 * pos.z, 0), 1.0), tint ) ).r;
} else {
float kernel[9] = float[]( 36/256.0, 24/256.0, 6/256.0,
24/256.0, 16/256.0, 4/256.0,
6/256.0, 4/256.0, 1/256.0 );
float shadow = 0;
for( int x = -2; x <= 2; ++x )
for( int y = -2; y <= 2; ++y )
shadow += kernel[abs(x)*3 + abs(y)] * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3(-0.005 * x * pos.z, -0.005 * y * pos.z, 0), 1.0), tint ) ).r;
#endif
shadow += kernel[abs(x)*3 + abs(y)] * shadow2DProj( shadow_tex, DynamicShadow( vec4(pos + vec3(-0.0025 * x * pos.z, -0.0025 * y * pos.z, 0), 1.0), tint ) ).r;
}
vec3 lightDir = (fg_ViewMatrix * vec4( fg_SunDirection, 0.0 )).xyz;
lightDir = normalize( lightDir );
vec3 color = texture2D( color_tex, coords ).rgb;

11
preferences.xml
View file

@ -182,11 +182,12 @@ Started September 2000 by David Megginson, david@megginson.com
<debug type="bool"
userarchive="y">false</debug>
<map-size type="int">4096</map-size>
<num-cascades type="int">4</num-cascades>
<cascade-far-m index="0" type="float">5.0</cascade-far-m>
<cascade-far-m index="1" type="float">50.0</cascade-far-m>
<cascade-far-m index="2" type="float">500.0</cascade-far-m>
<cascade-far-m index="3" type="float">5000.0</cascade-far-m>
<num-cascades type="int" userarchive="y">4</num-cascades>
<cascade-far-m index="0" type="float" userarchive="y">5.0</cascade-far-m>
<cascade-far-m index="1" type="float" userarchive="y">50.0</cascade-far-m>
<cascade-far-m index="2" type="float" userarchive="y">500.0</cascade-far-m>
<cascade-far-m index="3" type="float" userarchive="y">5000.0</cascade-far-m>
<filtering type="int" userarchive="y">2</filtering>
</shadows>
<shader-experimental type="bool"
userarchive="y">false</shader-experimental>