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‎jme3-terrain/src/main/resources/Common/MatDefs/Terrain/Modular/PBRTerrainUtils.glsllib‎

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#ifndef __PBR_TERRAIN_UTILS_MODULE__
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#define __PBR_TERRAIN_UTILS_MODULE__
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#import "Common/MatDefs/ShaderLib/PBRTerrainTextureLayer.glsl"
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#import "MatDefs/ShaderLib/TangentUtils.glsllib"
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#import "MatDefs/ShaderLib/TriPlanarUtils.glsllib"
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#ifdef ENABLE_PBRTerrainUtils_readPBRTerrainLayers
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//texture arrays:
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uniform sampler2DArray m_AlbedoTextureArray;
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uniform sampler2DArray m_NormalParallaxTextureArray;
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uniform sampler2DArray m_MetallicRoughnessAoEiTextureArray;
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//texture-slot params for 12 unique texture slots (0-11) where the integer value points to the desired texture's index in the corresponding texture array:
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#for i=0..12 (#ifdef ALBEDOMAP_$i $0 #endif)
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uniform int m_AfflictionMode_$i;
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uniform float m_Roughness_$i;
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uniform float m_Metallic_$i;
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uniform float m_AlbedoMap_$i_scale;
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uniform vec4 m_EmissiveColor_$i;
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uniform int m_AlbedoMap_$i;
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#endfor
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#for n=0..12 (#ifdef METALLICROUGHNESSMAP_$n $0 #endif)
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uniform int m_MetallicRoughnessMap_$n;
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#endfor
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#for x=0..12 (#ifdef NORMALMAP_$x $0 #endif)
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uniform int m_NormalMap_$x;
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#endfor
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//3 alpha maps :
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#ifdef ALPHAMAP
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uniform sampler2D m_AlphaMap;
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#endif
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#ifdef ALPHAMAP_1
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uniform sampler2D m_AlphaMap_1;
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#endif
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#ifdef ALPHAMAP_2
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uniform sampler2D m_AlphaMap_2;
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#endif
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vec4 alphaBlend_0, alphaBlend_1, alphaBlend_2;
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void PBRTerrainUtils_readAlphaMaps(){
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#ifdef ALPHAMAP
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alphaBlend_0 = texture2D( m_AlphaMap, texCoord.xy );
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#endif
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#ifdef ALPHAMAP_1
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alphaBlend_1 = texture2D( m_AlphaMap_1, texCoord.xy );
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#endif
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#ifdef ALPHAMAP_2
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alphaBlend_2 = texture2D( m_AlphaMap_2, texCoord.xy );
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#endif
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}
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float PBRTerrainUtils_getAlphaBlendFromChannel(int layer){
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float finalAlphaBlendForLayer = 0.0;
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vec4 alphaBlend;
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if(layer <= 3.0){
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alphaBlend = alphaBlend_0;
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}else if(layer <= 7.0){
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alphaBlend = alphaBlend_1;
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}else if(layer <= 11.0){
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alphaBlend = alphaBlend_2;
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}
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int texChannelForAlphaBlending = int(mod(float(layer), 4.0)); //pick the correct channel (r g b or a) based on the layer's index
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switch(texChannelForAlphaBlending) {
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case 0:
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finalAlphaBlendForLayer = alphaBlend.r;
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break;
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case 1:
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finalAlphaBlendForLayer = alphaBlend.g;
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break;
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case 2:
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finalAlphaBlendForLayer = alphaBlend.b;
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break;
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case 3:
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finalAlphaBlendForLayer = alphaBlend.a;
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break;
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}
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return finalAlphaBlendForLayer;
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}
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PBRTerrainTextureLayer PBRTerrainUtils_createAdvancedPBRTerrainLayer(int layerNum){
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PBRTerrainTextureLayer terrainTextureLayer;
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terrainTextureLayer.blendValue = PBRTerrainUtils_getAlphaBlendFromChannel(layerNum);
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return terrainTextureLayer;
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}
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//________
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void updateLayerFromPackedAlbedoMap(inout vec4 packedAlbedoVec, inout PBRTerrainTextureLayer layer){
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layer.albedo = packedAlbedoVec;
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layer.alpha = packedAlbedoVec.a;
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}
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void updateLayerFromPackedNormalParallaxVec(inout vec4 packedNormalParallaxVec, inout PBRTerrainTextureLayer layer){
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layer.normal = calculateTangentsAndApplyToNormals(packedNormalParallaxVec.rgb, PBRLightingUtils_getWorldNormal());
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layer.height = packedNormalParallaxVec.a;
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}
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void updateLayerFromPackedMRAoEiVec(inout vec4 packedMRAoEiVec, inout PBRTerrainTextureLayer layer){
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layer.ao = packedMRAoEiVec.r;
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layer.roughness = packedMRAoEiVec.g;
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layer.metallic = packedMRAoEiVec.b;
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layer.emission *= packedMRAoEiVec.a * layer.emission.a;
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}
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//________
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// read Triplanar Albedo from TextureArray:
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void PBRTerrainUtils_readTriPlanarAlbedoTexArray(in int indexInTexArray, in float scale, in sampler2DArray texArray, inout PBRTerrainTextureLayer layer){
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vec4 packedAlbedoVec = getTriPlanarBlendFromTexArray(lPosition, indexInTexArray, scale, texArray);
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updateLayerFromPackedAlbedoMap(packedAlbedoVec, layer);
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}
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// read Triplanar normal from TextureArray:
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void PBRTerrainUtils_readTriPlanarNormalTexArray(in int indexInTexArray, in float scale, in sampler2DArray texArray, inout PBRTerrainTextureLayer layer){
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vec4 packedNormalParallaxVec = getTriPlanarBlendFromTexArray(lPosition, indexInTexArray, scale, texArray);
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updateLayerFromPackedNormalParallaxVec(packedNormalParallaxVec, layer);
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}
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// read TriPlanar metallicRoughnessAoEi from TextureArray:
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void PBRTerrainUtils_readTriPlanarMetallicRoughnessAoEiTexArray(in int indexInTexArray, in float scale, in sampler2DArray texArray, inout PBRTerrainTextureLayer layer){
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vec4 packedMRAoEi = getTriPlanarBlendFromTexArray(lPosition, indexInTexArray, scale, texArray);
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updateLayerFromPackedMRAoEiVec(packedMRAoEi, layer);
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}
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//________
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// read Albedo from TextureArray:
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void PBRTerrainUtils_readAlbedoTexArray(in int indexInTexArray, in float scale, in sampler2DArray texArray, inout PBRTerrainTextureLayer layer){
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vec4 packedAlbedoVec = texture2DArray(texArray, vec3(texCoord * scale, indexInTexArray));
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updateLayerFromPackedAlbedoMap(packedAlbedoVec, layer);
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}
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// read Normal from TextureArray:
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void PBRTerrainUtils_readNormalTexArray(in int indexInTexArray, in float scale, in sampler2DArray texArray, inout PBRTerrainTextureLayer layer){
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vec4 packedNormalParallaxVec = texture2DArray(texArray, vec3(texCoord * scale, indexInTexArray));
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updateLayerFromPackedNormalParallaxVec(packedNormalParallaxVec, layer);
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}
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// read metallicRoughnessAoEi from TextureArray:
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void PBRTerrainUtils_readMetallicRoughnessAoEiTexArray(in int indexInTexArray, float scale, in sampler2DArray texArray, inout PBRTerrainTextureLayer layer){
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vec4 packedMRAoEi = texture2DArray(texArray, vec3(texCoord * scale, indexInTexArray));
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updateLayerFromPackedMRAoEiVec(packedMRAoEi, layer);
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}
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//________
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void PBRTerrainUtils_blendPBRTerrainLayer(inout PBRSurface surface, inout PBRTerrainTextureLayer layer){
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//mix values from this index layer to final output values based on finalAlphaBlendForLayer
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surface.albedo = mix(surface.albedo, layer.albedo.rgb, layer.blendValue);
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surface.normal = mix(surface.normal.rgb, layer.normal, layer.blendValue);
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surface.metallic = mix(surface.metallic, layer.metallic, layer.blendValue);
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surface.roughness = mix(surface.roughness, layer.roughness, layer.blendValue);
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surface.ao = mix(surface.ao, vec3(layer.ao), layer.blendValue);
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surface.emission = mix(surface.emission, layer.emission.rgb, layer.blendValue);
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}
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#endif
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#endif
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