surface selection work

docs/src/progress/renderertodo.md

@@ -1415,6 +1415,7 @@ Fix rock2 texture
 biome floor elements controlling noise generator's voxel selection
 Plains (rock) biome
 Lore message resend from client on failure
+More surface selection work
 
 
 

src/main/java/electrosphere/server/terrain/generation/TestGenerationChunkGenerator.java

@@ -26,6 +26,8 @@ import electrosphere.server.terrain.generation.voxelphase.NoiseVoxelGen;
 import electrosphere.server.terrain.generation.voxelphase.VoxelGenerator;
 import electrosphere.server.terrain.manager.ServerTerrainChunk;
 import electrosphere.server.terrain.models.TerrainModel;
+import electrosphere.util.noise.OpenSimplex2S;
+import io.github.studiorailgun.MathUtils;
 
 /**
  * A generator for testing terrain generation
@@ -143,6 +145,9 @@ public class TestGenerationChunkGenerator implements ChunkGenerator {
             BiomeData[][] surfaceBiomeMap = new BiomeData[ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE][ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE];
             this.populateElevation(heightfield,surfaceBiomeMap,worldX,worldZ,strideValue);
 
+            //presolve surface selection noise
+            double[][] surfaceSelectionField = new double[ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE][ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE];
+            this.surfaceSelectionNoise(surfaceSelectionField,worldX,worldZ,strideValue,this.terrainModel.getSeed());
 
             double[][] gradientField = new double[ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE][ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE];
             for(int x = 0; x < ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE; x++){
@@ -182,6 +187,7 @@ public class TestGenerationChunkGenerator implements ChunkGenerator {
                     double realZ = generationContext.getServerWorldData().convertVoxelToRealSpace(finalChunkZ,finalWorldZ);
                     double surfaceHeight = heightfield[x][z];
                     double gradient = gradientField[x][z];
+                    double surfaceSelection = surfaceSelectionField[x][z];
                     BiomeData surfaceBiome = surfaceBiomeMap[x][z];
                     BiomeSurfaceGenerationParams surfaceParams = surfaceBiome.getSurfaceGenerationParams();
 
@@ -196,7 +202,7 @@ public class TestGenerationChunkGenerator implements ChunkGenerator {
                             finalChunkX, finalChunkY, finalChunkZ,
                             realX, realY, realZ,
                             stride,
-                            surfaceHeight, gradient,
+                            surfaceHeight, gradient, surfaceSelection,
                             surfaceBiome, surfaceParams,
                             generationContext
                         );
@@ -284,6 +290,40 @@ public class TestGenerationChunkGenerator implements ChunkGenerator {
         }
     }
 
+    /**
+     * Populates the surface selection noise field
+     * @param surfaceNoiseField The surface selection noise field
+     * @param worldX The world x position
+     * @param worldZ The world z position
+     * @param strideValue The stride value
+     */
+    private void surfaceSelectionNoise(double[][] surfaceNoiseField, int worldX, int worldZ, int strideValue, long seed){
+        for(int x = 0; x < ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE; x++){
+            for(int z = 0; z < ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE; z++){
+                int finalWorldX = worldX + ((x * strideValue) / ServerTerrainChunk.CHUNK_DIMENSION);
+                int finalWorldZ = worldZ + ((z * strideValue) / ServerTerrainChunk.CHUNK_DIMENSION);
+                int finalChunkX = (x * strideValue) % ServerTerrainChunk.CHUNK_DIMENSION;
+                int finalChunkZ = (z * strideValue) % ServerTerrainChunk.CHUNK_DIMENSION;
+
+                if(finalWorldX > this.serverWorldData.getWorldSizeDiscrete() || finalWorldZ > this.serverWorldData.getWorldSizeDiscrete()){
+                    throw new Error("Invalid world dim! " + finalWorldX + " " + finalWorldZ);
+                }
+
+                double realX = serverWorldData.convertVoxelToRealSpace(finalChunkX, finalWorldX);
+                double realZ = serverWorldData.convertVoxelToRealSpace(finalChunkZ, finalWorldZ);
+
+                double warpX = OpenSimplex2S.noise3_ImproveXY(seed, realX, realZ, 0);
+                double warpZ = OpenSimplex2S.noise3_ImproveXY(seed, realX, realZ, 1);
+                double valueRaw = OpenSimplex2S.noise2(seed, realX + warpX, realZ + warpZ);
+                double fixed = (MathUtils.clamp(valueRaw, -1, 1) + 1) / 2.0;
+                if(fixed < 0){
+                    throw new Error("Failed to clamp value properly! " + valueRaw + " " + fixed);
+                }
+                surfaceNoiseField[x][z] = fixed;
+            }
+        }
+    }
+
     /**
      * Gets the elevation of a given position by sampling all four surrounding biome generators
      * @param finalWorldX The world x coordinate

src/main/java/electrosphere/server/terrain/generation/voxelphase/AnimeMountainsGen.java

@@ -79,7 +79,7 @@ public class AnimeMountainsGen implements VoxelGenerator {
         int worldX, int worldY, int worldZ,
         int chunkX, int chunkY, int chunkZ,
         double realX, double realY, double realZ,
-        int stride, double surfaceHeight, double surfaceGradient, 
+        int stride, double surfaceHeight, double surfaceGradient, double surfaceSelectionNoise,
         BiomeData surfaceBiome, BiomeSurfaceGenerationParams surfaceParams,
         GenerationContext generationContext
     ) {

src/main/java/electrosphere/server/terrain/generation/voxelphase/HillsVoxelGen.java

@@ -39,7 +39,7 @@ public class HillsVoxelGen implements VoxelGenerator {
         int chunkX, int chunkY, int chunkZ,
         double realX, double realY, double realZ,
         int stride,
-        double surfaceHeight, double surfaceGradient,
+        double surfaceHeight, double surfaceGradient, double surfaceSelectionNoise,
         BiomeData surfaceBiome, BiomeSurfaceGenerationParams surfaceParams,
         GenerationContext generationContext
     ){

src/main/java/electrosphere/server/terrain/generation/voxelphase/MountainVoxelGen.java

@@ -45,7 +45,7 @@ public class MountainVoxelGen  implements VoxelGenerator {
         int chunkX, int chunkY, int chunkZ,
         double realX, double realY, double realZ,
         int stride,
-        double surfaceHeight, double surfaceGradient,
+        double surfaceHeight, double surfaceGradient, double surfaceSelectionNoise,
         BiomeData surfaceBiome, BiomeSurfaceGenerationParams surfaceParams,
         GenerationContext generationContext
     ){

src/main/java/electrosphere/server/terrain/generation/voxelphase/NoiseVoxelGen.java

@@ -63,7 +63,7 @@ public class NoiseVoxelGen implements VoxelGenerator {
         int worldX, int worldY, int worldZ,
         int chunkX, int chunkY, int chunkZ,
         double realX, double realY, double realZ,
-        int stride, double surfaceHeight, double surfaceGradient,
+        int stride, double surfaceHeight, double surfaceGradient, double surfaceSelectionNoise,
         BiomeData surfaceBiome, BiomeSurfaceGenerationParams surfaceParams,
         GenerationContext generationContext
     ) {
@@ -94,13 +94,13 @@ public class NoiseVoxelGen implements VoxelGenerator {
             voxel.weight = -1.0f;
             voxel.type = 0;
         } else if(heightDiff < -strideMultiplier){
-            BiomeFloorElement floorEl = surfaceParams.getFloorVariant((float)surfaceGradient);
+            BiomeFloorElement floorEl = surfaceParams.getFloorVariant((float)surfaceSelectionNoise);
             //generate full-size surface-type voxel
             double finalHeight = sample;
             voxel.weight = (float)finalHeight;
             voxel.type = floorEl.getVoxelId();
         } else {
-            BiomeFloorElement floorEl = surfaceParams.getFloorVariant((float)surfaceGradient);
+            BiomeFloorElement floorEl = surfaceParams.getFloorVariant((float)surfaceSelectionNoise);
             //surface
             double surfacePercent = -heightDiff / strideMultiplier;
             if(surfacePercent > 1.0 || surfacePercent < 0){

src/main/java/electrosphere/server/terrain/generation/voxelphase/VoxelGenerator.java

@@ -37,6 +37,7 @@ public interface VoxelGenerator {
      * @param stride The stride of the data
      * @param surfaceHeight The height of the surface at x,z
      * @param surfaceGradient The rate of change in the surface at this point
+     * @param surfaceSelectionNoise The noise value to select surface variants
      * @param surfaceBiome The surface biome of the chunk
      * @param surfaceGenPArams Extra parameters for generating surface voxel values
      * @param generationContext The generation context
@@ -47,7 +48,7 @@ public interface VoxelGenerator {
         int chunkX, int chunkY, int chunkZ,
         double realX, double realY, double realZ,
         int stride,
-        double surfaceHeight, double surfaceGradient,
+        double surfaceHeight, double surfaceGradient, double surfaceSelectionNoise,
         BiomeData surfaceBiome, BiomeSurfaceGenerationParams surfaceGenParams,
         GenerationContext generationContext
     );