/**
* @author alteredq / http://alteredqualia.com/
*
*/
THREE.TerrainShader = {
/* -------------------------------------------------------------------------
// Dynamic terrain shader
// - Blinn-Phong
// - height + normal + diffuse1 + diffuse2 + specular + detail maps
// - point, directional and hemisphere lights (use with "lights: true" material option)
// - shadow maps receiving
------------------------------------------------------------------------- */
uniforms: THREE.UniformsUtils.merge( [
THREE.UniformsLib[ "fog" ],
THREE.UniformsLib[ "lights" ],
{
"enableDiffuse1": { value: 0 },
"enableDiffuse2": { value: 0 },
"enableSpecular": { value: 0 },
"enableReflection": { value: 0 },
"tDiffuse1": { value: null },
"tDiffuse2": { value: null },
"tDetail": { value: null },
"tNormal": { value: null },
"tSpecular": { value: null },
"tDisplacement": { value: null },
"uNormalScale": { value: 1.0 },
"uDisplacementBias": { value: 0.0 },
"uDisplacementScale": { value: 1.0 },
"diffuse": { value: new THREE.Color( 0xeeeeee ) },
"specular": { value: new THREE.Color( 0x111111 ) },
"shininess": { value: 30 },
"opacity": { value: 1 },
"uRepeatBase": { value: new THREE.Vector2( 1, 1 ) },
"uRepeatOverlay": { value: new THREE.Vector2( 1, 1 ) },
"uOffset": { value: new THREE.Vector2( 0, 0 ) }
}
] ),
fragmentShader: [
"uniform vec3 diffuse;",
"uniform vec3 specular;",
"uniform float shininess;",
"uniform float opacity;",
"uniform bool enableDiffuse1;",
"uniform bool enableDiffuse2;",
"uniform bool enableSpecular;",
"uniform sampler2D tDiffuse1;",
"uniform sampler2D tDiffuse2;",
"uniform sampler2D tDetail;",
"uniform sampler2D tNormal;",
"uniform sampler2D tSpecular;",
"uniform sampler2D tDisplacement;",
"uniform float uNormalScale;",
"uniform vec2 uRepeatOverlay;",
"uniform vec2 uRepeatBase;",
"uniform vec2 uOffset;",
"varying vec3 vTangent;",
"varying vec3 vBinormal;",
"varying vec3 vNormal;",
"varying vec2 vUv;",
"varying vec3 vViewPosition;",
THREE.ShaderChunk[ "common" ],
THREE.ShaderChunk[ "bsdfs" ],
THREE.ShaderChunk[ "lights_pars_begin" ],
THREE.ShaderChunk[ "shadowmap_pars_fragment" ],
THREE.ShaderChunk[ "fog_pars_fragment" ],
"float calcLightAttenuation( float lightDistance, float cutoffDistance, float decayExponent ) {",
" if ( decayExponent > 0.0 ) {",
" return pow( saturate( - lightDistance / cutoffDistance + 1.0 ), decayExponent );",
" }",
" return 1.0;",
" }",
"void main() {",
" vec3 outgoingLight = vec3( 0.0 );", // outgoing light does not have an alpha, the surface does
" vec4 diffuseColor = vec4( diffuse, opacity );",
" vec3 specularTex = vec3( 1.0 );",
" vec2 uvOverlay = uRepeatOverlay * vUv + uOffset;",
" vec2 uvBase = uRepeatBase * vUv;",
" vec3 normalTex = texture2D( tDetail, uvOverlay ).xyz * 2.0 - 1.0;",
" normalTex.xy *= uNormalScale;",
" normalTex = normalize( normalTex );",
" if( enableDiffuse1 && enableDiffuse2 ) {",
" vec4 colDiffuse1 = texture2D( tDiffuse1, uvOverlay );",
" vec4 colDiffuse2 = texture2D( tDiffuse2, uvOverlay );",
" colDiffuse1 = GammaToLinear( colDiffuse1, float( GAMMA_FACTOR ) );",
" colDiffuse2 = GammaToLinear( colDiffuse2, float( GAMMA_FACTOR ) );",
" diffuseColor *= mix ( colDiffuse1, colDiffuse2, 1.0 - texture2D( tDisplacement, uvBase ) );",
" } else if( enableDiffuse1 ) {",
" diffuseColor *= texture2D( tDiffuse1, uvOverlay );",
" } else if( enableDiffuse2 ) {",
" diffuseColor *= texture2D( tDiffuse2, uvOverlay );",
" }",
" if( enableSpecular )",
" specularTex = texture2D( tSpecular, uvOverlay ).xyz;",
" mat3 tsb = mat3( vTangent, vBinormal, vNormal );",
" vec3 finalNormal = tsb * normalTex;",
" vec3 normal = normalize( finalNormal );",
" vec3 viewPosition = normalize( vViewPosition );",
" vec3 totalDiffuseLight = vec3( 0.0 );",
" vec3 totalSpecularLight = vec3( 0.0 );",
// point lights
" #if NUM_POINT_LIGHTS > 0",
" for ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {",
" vec3 lVector = pointLights[ i ].position + vViewPosition.xyz;",
" float attenuation = calcLightAttenuation( length( lVector ), pointLights[ i ].distance, pointLights[ i ].decay );",
" lVector = normalize( lVector );",
" vec3 pointHalfVector = normalize( lVector + viewPosition );",
" float pointDotNormalHalf = max( dot( normal, pointHalfVector ), 0.0 );",
" float pointDiffuseWeight = max( dot( normal, lVector ), 0.0 );",
" float pointSpecularWeight = specularTex.r * max( pow( pointDotNormalHalf, shininess ), 0.0 );",
" totalDiffuseLight += attenuation * pointLights[ i ].color * pointDiffuseWeight;",
" totalSpecularLight += attenuation * pointLights[ i ].color * specular * pointSpecularWeight * pointDiffuseWeight;",
" }",
" #endif",
// directional lights
" #if NUM_DIR_LIGHTS > 0",
" vec3 dirDiffuse = vec3( 0.0 );",
" vec3 dirSpecular = vec3( 0.0 );",
" for( int i = 0; i < NUM_DIR_LIGHTS; i++ ) {",
" vec3 dirVector = directionalLights[ i ].direction;",
" vec3 dirHalfVector = normalize( dirVector + viewPosition );",
" float dirDotNormalHalf = max( dot( normal, dirHalfVector ), 0.0 );",
" float dirDiffuseWeight = max( dot( normal, dirVector ), 0.0 );",
" float dirSpecularWeight = specularTex.r * max( pow( dirDotNormalHalf, shininess ), 0.0 );",
" totalDiffuseLight += directionalLights[ i ].color * dirDiffuseWeight;",
" totalSpecularLight += directionalLights[ i ].color * specular * dirSpecularWeight * dirDiffuseWeight;",
" }",
" #endif",
// hemisphere lights
" #if NUM_HEMI_LIGHTS > 0",
" vec3 hemiDiffuse = vec3( 0.0 );",
" vec3 hemiSpecular = vec3( 0.0 );",
" for( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {",
" vec3 lVector = hemisphereLightDirection[ i ];",
// diffuse
" float dotProduct = dot( normal, lVector );",
" float hemiDiffuseWeight = 0.5 * dotProduct + 0.5;",
" totalDiffuseLight += mix( hemisphereLights[ i ].groundColor, hemisphereLights[ i ].skyColor, hemiDiffuseWeight );",
// specular (sky light)
" float hemiSpecularWeight = 0.0;",
" vec3 hemiHalfVectorSky = normalize( lVector + viewPosition );",
" float hemiDotNormalHalfSky = 0.5 * dot( normal, hemiHalfVectorSky ) + 0.5;",
" hemiSpecularWeight += specularTex.r * max( pow( hemiDotNormalHalfSky, shininess ), 0.0 );",
// specular (ground light)
" vec3 lVectorGround = -lVector;",
" vec3 hemiHalfVectorGround = normalize( lVectorGround + viewPosition );",
" float hemiDotNormalHalfGround = 0.5 * dot( normal, hemiHalfVectorGround ) + 0.5;",
" hemiSpecularWeight += specularTex.r * max( pow( hemiDotNormalHalfGround, shininess ), 0.0 );",
" totalSpecularLight += specular * mix( hemisphereLights[ i ].groundColor, hemisphereLights[ i ].skyColor, hemiDiffuseWeight ) * hemiSpecularWeight * hemiDiffuseWeight;",
" }",
" #endif",
" outgoingLight += diffuseColor.xyz * ( totalDiffuseLight + ambientLightColor + totalSpecularLight );",
" gl_FragColor = vec4( outgoingLight, diffuseColor.a );", // TODO, this should be pre-multiplied to allow for bright highlights on very transparent objects
THREE.ShaderChunk[ "fog_fragment" ],
"}"
].join( "\n" ),
vertexShader: [
"attribute vec4 tangent;",
"uniform vec2 uRepeatBase;",
"uniform sampler2D tNormal;",
"#ifdef VERTEX_TEXTURES",
" uniform sampler2D tDisplacement;",
" uniform float uDisplacementScale;",
" uniform float uDisplacementBias;",
"#endif",
"varying vec3 vTangent;",
"varying vec3 vBinormal;",
"varying vec3 vNormal;",
"varying vec2 vUv;",
"varying vec3 vViewPosition;",
THREE.ShaderChunk[ "shadowmap_pars_vertex" ],
THREE.ShaderChunk[ "fog_pars_vertex" ],
"void main() {",
" vNormal = normalize( normalMatrix * normal );",
// tangent and binormal vectors
" vTangent = normalize( normalMatrix * tangent.xyz );",
" vBinormal = cross( vNormal, vTangent ) * tangent.w;",
" vBinormal = normalize( vBinormal );",
// texture coordinates
" vUv = uv;",
" vec2 uvBase = uv * uRepeatBase;",
// displacement mapping
" #ifdef VERTEX_TEXTURES",
" vec3 dv = texture2D( tDisplacement, uvBase ).xyz;",
" float df = uDisplacementScale * dv.x + uDisplacementBias;",
" vec3 displacedPosition = normal * df + position;",
" vec4 worldPosition = modelMatrix * vec4( displacedPosition, 1.0 );",
" vec4 mvPosition = modelViewMatrix * vec4( displacedPosition, 1.0 );",
" #else",
" vec4 worldPosition = modelMatrix * vec4( position, 1.0 );",
" vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );",
" #endif",
" gl_Position = projectionMatrix * mvPosition;",
" vViewPosition = -mvPosition.xyz;",
" vec3 normalTex = texture2D( tNormal, uvBase ).xyz * 2.0 - 1.0;",
" vNormal = normalMatrix * normalTex;",
THREE.ShaderChunk[ "shadowmap_vertex" ],
THREE.ShaderChunk[ "fog_vertex" ],
"}"
].join( "\n" )
};
