Initial tree generation

Still very slow because multiple noise evaluations are needed

include/block.hpp

@@ -6,7 +6,9 @@ enum class Block{
     AIR,
     STONE,
     DIRT,
-    GRASS
+    GRASS,
+    WOOD,
+    LEAVES
 };
 
 #endif

include/globals.hpp

@@ -16,6 +16,9 @@ extr Camera theCamera;
 constexpr int chunks_volume = static_cast<int>(1.333333333333*M_PI*(RENDER_DISTANCE*RENDER_DISTANCE*RENDER_DISTANCE));
 extr bool wireframe;
 
+extr float sines[360];
+extr float cosines[360];
+
 extr uint32_t MORTON_XYZ_ENCODE[CHUNK_SIZE][CHUNK_SIZE][CHUNK_SIZE];
 extr uint32_t MORTON_XYZ_DECODE[CHUNK_VOLUME][3];
 extr uint32_t HILBERT_XYZ_ENCODE[CHUNK_SIZE][CHUNK_SIZE][CHUNK_SIZE];

src/chunkgenerator.cpp

@@ -1,6 +1,7 @@
 #include <array>
 #include <iostream>
 #include <random> // for std::mt19937
+#include <experimental/random>
 
 #include "block.hpp"
 #include "chunkgenerator.hpp"
@@ -8,34 +9,43 @@
 #include "OpenSimplexNoise.h"
 #include "utils.hpp"
 
-#define GRASS_OFFSET 100
-#define NOISE_GRASS_MULT 50
+#define GRASS_OFFSET 40
+#define NOISE_GRASS_MULT 30
 #define NOISE_DIRT_MULT 3
 #define NOISE_DIRT_MIN 3
 #define NOISE_DIRT_X_MULT 0.001f
 #define NOISE_DIRT_Z_MULT 0.001f
 #define NOISE_GRASS_X_MULT 0.018f
 #define NOISE_GRASS_Z_MULT 0.018f
+#define NOISE_TREE_X_MULT 0.01f
+#define NOISE_TREE_Z_MULT 0.01f
+
+#define LEAVES_RADIUS 3
+#define WOOD_CELL_SIZE 13
+#define WOOD_CELL_CENTER 7
+#define WOOD_CELL_BORDER (LEAVES_RADIUS-1)
+#define WOOD_MAX_OFFSET (WOOD_CELL_SIZE-WOOD_CELL_CENTER-WOOD_CELL_BORDER)
+#define TREE_STANDARD_HEIGHT 7
+#define TREE_HEIGHT_VARIATION 2
 
 void generatePyramid(Chunk::Chunk *chunk);
 void generateNoise(Chunk::Chunk *chunk);
 void generateNoise3D(Chunk::Chunk *chunk);
 
-void generateChunk(Chunk::Chunk *chunk)
-{
-    generateNoise(chunk);
-}
-
-Block block;
-
 std::random_device dev;
 std::mt19937 mt(dev());
 OpenSimplexNoise::Noise noiseGen1(mt());
 OpenSimplexNoise::Noise noiseGen2(mt());
+OpenSimplexNoise::Noise noiseGenWood(mt());
 
 std::array<int, CHUNK_SIZE * CHUNK_SIZE> grassNoiseLUT;
 std::array<int, CHUNK_SIZE * CHUNK_SIZE> dirtNoiseLUT;
 
+void generateChunk(Chunk::Chunk *chunk)
+{
+    generateNoise(chunk);
+}
+
 double evaluateNoise(OpenSimplexNoise::Noise noiseGen, double x, double y, double amplitude, double
 	frequency, double persistence, double lacunarity, int octaves){
     double sum = 0;
@@ -49,12 +59,60 @@ double evaluateNoise(OpenSimplexNoise::Noise noiseGen, double x, double y, doubl
     return sum;
 }
 
+const int TREE_MASTER_SEED_X = mt();
+const int TREE_MASTER_SEED_Z = mt();
+
+void evaluateTreeCell(int cx, int cz, int wcx, int wcz, int* wcx_offset, int*
+	wcz_offset, int* wx, int* wz, int* bwx, int* bwz, int* leaves_noise){
+	
+	static int old_cx = -1, old_cz = -1, old_leaves_noise = -1;
+
+	int anglex = TREE_MASTER_SEED_X*wcx+TREE_MASTER_SEED_Z*wcz;
+	int anglez = TREE_MASTER_SEED_Z*wcz+TREE_MASTER_SEED_X*wcx;
+
+	// Start at the center of the cell, with a bit of random offset
+	int wcx_off = WOOD_CELL_CENTER + WOOD_MAX_OFFSET * sines[anglex % 360];
+	int wcz_off = WOOD_CELL_CENTER + WOOD_MAX_OFFSET * cosines[anglez % 360];
+
+	//std::cout << "cell: (" << wcx << "," << wcz << "): offset: (" << (int)wcx_off << "," << (int)wcz_off << ")\n";
+
+	// Cell to world coordinates
+	*wx = wcx * WOOD_CELL_SIZE + wcx_off;
+	*wz = wcz * WOOD_CELL_SIZE + wcz_off;
+
+	*wcx_offset = wcx_off;
+	*wcz_offset = wcz_off;
+
+	*bwx = *wx - cx;
+	*bwz = *wz - cz;
+
+	if(old_leaves_noise == -1 || old_cx != cx || old_cz != cx || *bwx < 0 || *bwz < 0 || *bwx >= CHUNK_SIZE || *bwz >= CHUNK_SIZE)
+	     *leaves_noise = TREE_STANDARD_HEIGHT + GRASS_OFFSET + evaluateNoise(noiseGen1, *wx, *wz, NOISE_GRASS_MULT, 0.01, 0.35, 2.1, 5);
+	else *leaves_noise = TREE_STANDARD_HEIGHT + grassNoiseLUT[*bwx * CHUNK_SIZE + *bwz];
+
+	old_leaves_noise = *leaves_noise;
+	old_cx = cx;
+	old_cz = cz;
+}
+
+
+Block block;
+
 void generateNoise(Chunk::Chunk *chunk)
 {
+    int cx = chunk->getPosition().x * CHUNK_SIZE;
+    int cy = chunk->getPosition().y * CHUNK_SIZE;
+    int cz = chunk->getPosition().z * CHUNK_SIZE;
+
+    // Precalculate LUTs
     for (int i = 0; i < grassNoiseLUT.size(); i++)
     {
-        grassNoiseLUT[i] = -1;
-        dirtNoiseLUT[i] = -1;
+	int bx = i / CHUNK_SIZE;
+	int bz = i % CHUNK_SIZE;
+
+	grassNoiseLUT[i] = GRASS_OFFSET + evaluateNoise(noiseGen1, cx+bx, cz+bz, NOISE_GRASS_MULT, 0.01, 0.35, 2.1, 5);
+	dirtNoiseLUT[i] = NOISE_DIRT_MIN + (int)((1 + noiseGen2.eval(cx+bx * NOISE_DIRT_X_MULT,
+			cz+bz * NOISE_DIRT_Z_MULT)) * NOISE_DIRT_MULT);
     }
 
     Block block_prev{Block::AIR};
@@ -64,18 +122,13 @@ void generateNoise(Chunk::Chunk *chunk)
     for (int s = 0; s < CHUNK_VOLUME; s++)
     {
 
-        int x = HILBERT_XYZ_DECODE[s][0] + CHUNK_SIZE * chunk->getPosition().x;
-        int y = HILBERT_XYZ_DECODE[s][1] + CHUNK_SIZE * chunk->getPosition().y;
-        int z = HILBERT_XYZ_DECODE[s][2] + CHUNK_SIZE * chunk->getPosition().z;
-        int d2 = HILBERT_XYZ_DECODE[s][0] * CHUNK_SIZE + HILBERT_XYZ_DECODE[s][2];
-
-        if (grassNoiseLUT[d2] == -1) 
-	    grassNoiseLUT[d2] = GRASS_OFFSET + evaluateNoise(noiseGen1, x, z, NOISE_GRASS_MULT,
-		    0.01, 0.35, 2.1, 5);
-        if (dirtNoiseLUT[d2] == -1) 
-	    dirtNoiseLUT[d2] = NOISE_DIRT_MIN + (int)((1 + noiseGen2.eval(x
-			* NOISE_DIRT_X_MULT, z * NOISE_DIRT_Z_MULT)) * NOISE_DIRT_MULT);
-
+	int bx = HILBERT_XYZ_DECODE[s][0];
+	int by = HILBERT_XYZ_DECODE[s][1];
+	int bz = HILBERT_XYZ_DECODE[s][2];
+        int x = bx + cx;
+        int y = by + cy;
+        int z = bz + cz;
+        int d2 = bx * CHUNK_SIZE + bz;
 	
         int grassNoise = grassNoiseLUT[d2];
         int dirtNoise = dirtNoiseLUT[d2];
@@ -90,15 +143,56 @@ void generateNoise(Chunk::Chunk *chunk)
 	    else
             block = Block::AIR;
 
+
+	// Divide the world into cells, so that no two trees will be adjacent of each other
+	int wcx = x / WOOD_CELL_SIZE, wcz = z / WOOD_CELL_SIZE;
+	int wcx_offset, wcz_offset, wx, wz, bwx, bwz, leavesNoise;
+
+	evaluateTreeCell(cx, cz, wcx, wcz, &wcx_offset, &wcz_offset, &wx, &wz, &bwx, &bwz,
+		&leavesNoise);
+
+	// A tree is to be places if the coordinates are those of the tree of the current cell
+	int wood_height = TREE_STANDARD_HEIGHT;// + noiseGenWood.eval(wcx * NOISE_TREE_X_MULT, wcz * NOISE_TREE_Z_MULT) * TREE_HEIGHT_VARIATION;
+	bool wood = x == wx && z == wz && y > grassNoiseLUT[d2] && y <= leavesNoise;
+	bool leaf = false;
+
+	leaf = wood && y > leavesNoise && y < leavesNoise+LEAVES_RADIUS;
+	if(!leaf) leaf = utils::withinDistance(x,y,z, wx, leavesNoise, wz, LEAVES_RADIUS);
+
+	if(!leaf){
+	    evaluateTreeCell(cx, cz, wcx+1, wcz, &wcx_offset, &wcz_offset, &wx, &wz, &bwx, &bwz,
+		    &leavesNoise);
+	    leaf = utils::withinDistance(x,y,z, wx, leavesNoise, wz, LEAVES_RADIUS);
+	}
+
+	if(!leaf){
+	    evaluateTreeCell(cx, cz, wcx, wcz+1, &wcx_offset, &wcz_offset, &wx, &wz, &bwx, &bwz,
+		    &leavesNoise);
+	    leaf = utils::withinDistance(x,y,z, wx, leavesNoise, wz, LEAVES_RADIUS);
+	}
+
+	if(!leaf){
+	    evaluateTreeCell(cx, cz, wcx-1, wcz, &wcx_offset, &wcz_offset, &wx, &wz, &bwx, &bwz,
+		    &leavesNoise);
+	 leaf = utils::withinDistance(x,y,z, wx, leavesNoise, wz, LEAVES_RADIUS);
+	}
+
+	if(!leaf){
+	    evaluateTreeCell(cx, cz, wcx, wcz-1, &wcx_offset, &wcz_offset, &wx, &wz, &bwx, &bwz,
+		    &leavesNoise);
+	    leaf = utils::withinDistance(x,y,z, wx, leavesNoise, wz, LEAVES_RADIUS);
+	}
+
+	if(wood) block = Block::WOOD;
+	if(leaf) block = Block::LEAVES;
+
         if (block != block_prev)
         {
             chunk->setBlocks(block_prev_start, s, block_prev);
             block_prev_start = s;
         }
-
         block_prev = block;
     }
-
     chunk->setBlocks(block_prev_start, CHUNK_VOLUME, block_prev);
     chunk->setState(Chunk::CHUNK_STATE_GENERATED, true);
 }

src/main.cpp

@@ -63,8 +63,12 @@ int main()
 
     std::cout << "Using GPU: " << glGetString(GL_VENDOR) << " " << glGetString(GL_RENDERER) << "\n";
 
-    SpaceFilling::initLUT();
     wireframe = false;
+    for(int i = 0; i < 360; i++){
+	sines[i] = sin(3.14 / 180 * i);
+	cosines[i] = cos(3.14 / 180 * i);
+    }
+    SpaceFilling::initLUT();
     renderer::init();
     std::thread chunkmanager_thread = chunkmanager::init();
 

src/renderer.cpp

@@ -26,7 +26,7 @@ namespace renderer{
 	theShader = new Shader{"shaders/shader-texture.gs", "shaders/shader-texture.vs", "shaders/shader-texture.fs"};
 
 	// Create 3d array texture
-	constexpr int layerCount = 3;
+	constexpr int layerCount = 5;
 	glGenTextures(1, &chunkTexture);
 	glBindTexture(GL_TEXTURE_2D_ARRAY, chunkTexture);
 	
@@ -38,6 +38,10 @@ namespace renderer{
 	glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 1, width, height, 1, GL_RGBA, GL_UNSIGNED_BYTE, texels1);
 	unsigned char *texels2 = stbi_load("textures/grass_top.png", &width, &height, &nrChannels, 0);
 	glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 2, width, height, 1, GL_RGB, GL_UNSIGNED_BYTE, texels2);
+	unsigned char *texels3 = stbi_load("textures/wood.png", &width, &height, &nrChannels, 0);
+	glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 3, width, height, 1, GL_RGBA, GL_UNSIGNED_BYTE, texels3);
+	unsigned char *texels4 = stbi_load("textures/leaves.png", &width, &height, &nrChannels, 0);
+	glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 4, width, height, 1, GL_RGBA, GL_UNSIGNED_BYTE, texels4);
 
 	glTexParameteri(GL_TEXTURE_2D_ARRAY,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
 	glTexParameteri(GL_TEXTURE_2D_ARRAY,GL_TEXTURE_MAG_FILTER,GL_NEAREST);