noise features, fixed some grid stuff.

tests/g3test2.cpp

@@ -22,8 +22,8 @@
 struct defaults {
     int outWidth = 512;
     int outHeight = 512;
-    int gridWidth = 64;
-    int gridHeight = 64;
+    int gridWidth = 512;
+    int gridHeight = 512;
     int gridDepth = 64;
     float fps = 30.0f;
     PNoise2 noise = PNoise2(42);
@@ -51,6 +51,18 @@ void setup(defaults config, VoxelGrid& grid) {
     uint8_t threshold = 0.1 * 255;
     grid.resize(config.gridWidth, config.gridHeight, config.gridDepth);
     std::cout << "Generating grid of size " << config.gridWidth << "x" << config.gridHeight << "x" << config.gridDepth << std::endl;
+    size_t rValw = config.gridWidth  / 64;
+    size_t rValh = config.gridHeight / 64;
+    size_t rVald = config.gridDepth  / 64;
+    size_t gValw = config.gridWidth  / 32;
+    size_t gValh = config.gridHeight / 32;
+    size_t gVald = config.gridDepth  / 32;
+    size_t bValw = config.gridWidth  / 16;
+    size_t bValh = config.gridHeight / 16;
+    size_t bVald = config.gridDepth  / 16;
+    size_t aValw = config.gridWidth  / 8;
+    size_t aValh = config.gridHeight / 8;
+    size_t aVald = config.gridDepth  / 8;
     for (int z = 0; z < config.gridDepth; ++z) {
         if (z % 64 == 0) {
             std::cout << "Processing layer " << z << " of " << config.gridDepth << std::endl;
@@ -58,10 +70,10 @@ void setup(defaults config, VoxelGrid& grid) {
 
         for (int y = 0; y < config.gridHeight; ++y) {
             for (int x = 0; x < config.gridWidth; ++x) {
-                uint8_t r = config.noise.permute(Vec3f(static_cast<float>(x) / config.gridWidth / 64, static_cast<float>(y) / config.gridHeight / 64, static_cast<float>(z) / config.gridDepth / 64)) * 255;
-                uint8_t g = config.noise.permute(Vec3f(static_cast<float>(x) / config.gridWidth / 32, static_cast<float>(y) / config.gridHeight / 32, static_cast<float>(z) / config.gridDepth / 32)) * 255;
-                uint8_t b = config.noise.permute(Vec3f(static_cast<float>(x) / config.gridWidth / 16, static_cast<float>(y) / config.gridHeight / 16, static_cast<float>(z) / config.gridDepth / 16)) * 255;
-                uint8_t a = config.noise.permute(Vec3f(static_cast<float>(x) / config.gridWidth / 8 , static_cast<float>(y) / config.gridHeight / 8 , static_cast<float>(z) / config.gridDepth / 8)) * 255;
+                uint8_t r = config.noise.permute(Vec3f(static_cast<float>(x) * rValw, static_cast<float>(y) * rValh, static_cast<float>(z) * rVald)) * 255;
+                uint8_t g = config.noise.permute(Vec3f(static_cast<float>(x) * gValw, static_cast<float>(y) * gValh, static_cast<float>(z) * gVald)) * 255;
+                uint8_t b = config.noise.permute(Vec3f(static_cast<float>(x) * bValw, static_cast<float>(y) * bValh, static_cast<float>(z) * bVald)) * 255;
+                uint8_t a = config.noise.permute(Vec3f(static_cast<float>(x) * aValw, static_cast<float>(y) * aValh, static_cast<float>(z) * aVald)) * 255;
                 //Vec4ui8 noisecolor = config.noise.permuteColor(Vec3f( static_cast<float>(x) / 64, static_cast<float>(y) / 64, static_cast<float>(z) / 64));
                 if (a > threshold) {
                     //std::cout << "setting a position" << std::endl;
@@ -155,6 +167,14 @@ void stopAndSaveAVI(defaults& config, const std::string& filename) {
     recordingFramesRemaining = 0;
 }
 
+void saveSlices(defaults& config, VoxelGrid& grid) {
+    std::vector<frame> frames = grid.genSlices(frame::colormap::RGB);
+    for (int i = 0; i < frames.size(); i++) {
+        std::string filename = "output/slices/" + std::to_string(i) + ".bmp";
+        BMPWriter::saveBMP(filename, frames[i]);
+    }
+}
+
 static void glfw_error_callback(int error, const char* description)
 {
     fprintf(stderr, "GLFW Error %d: %s\n", error, description);
@@ -341,6 +361,10 @@ int main() {
                 cameraMoved = true;
             }
             
+            if (ImGui::Button("Save Slices")) {
+                saveSlices(config, grid);
+            }
+
             // AVI Recording Controls
             ImGui::Separator();
             ImGui::Text("AVI Recording:");

util/grid/grid3.hpp

@@ -659,6 +659,89 @@ public:
     bool isMeshDirty() const {
         return meshDirty;
     }
+
+    std::vector<frame> genSlices(frame::colormap colorFormat = frame::colormap::RGB) const {
+        TIME_FUNCTION;
+        int colors;
+        std::vector<frame> outframes;
+        switch (colorFormat) {
+            case frame::colormap::RGBA:
+            case frame::colormap::BGRA: {
+                colors = 4;
+                break;
+            }
+            case frame::colormap::B: {
+                colors = 1;
+                break;
+            }
+            case frame::colormap::RGB:
+            case frame::colormap::BGR:
+            default: {
+                colors = 3;
+                break;
+            }
+        }
+        size_t cbsize = gridSize.x * gridSize.y * colors;
+        for (int layer = 0; layer < getDepth(); layer++) {
+            int layerMult = layer * gridSize.x * gridSize.y;
+            frame layerFrame(gridSize.x, gridSize.y, colorFormat);
+            std::vector<uint8_t> colorBuffer(cbsize);
+            for (int y = 0; y < gridSize.y; y++) {
+                int yMult = layerMult + (y * gridSize.x);
+                for (int x = 0; x < gridSize.x; x++)  {
+                    int vidx = yMult+x;
+                    int pidx = (y * gridSize.x + x) * colors;
+                    Voxel cv = voxels[vidx];
+                    Vec3ui8 cvColor;
+                    float cvAlpha;
+                    if (cv.active) {
+                        cvColor = cv.color;
+                        cvAlpha = cv.alpha;
+                    } else {
+                        cvColor = Vec3ui8(255,255,255);
+                        cvAlpha = 255;
+                    }
+                    switch (colorFormat) {
+                        case frame::colormap::RGBA: {
+                            colorBuffer[pidx + 1] = cvColor.x;
+                            colorBuffer[pidx + 2] = cvColor.y;
+                            colorBuffer[pidx + 3] = cvColor.z;
+                            colorBuffer[pidx + 0] = cvAlpha;
+                            break;
+                        }
+                        case frame::colormap::BGRA: {
+                            colorBuffer[pidx + 3] = cvColor.x;
+                            colorBuffer[pidx + 2] = cvColor.y;
+                            colorBuffer[pidx + 1] = cvColor.z;
+                            colorBuffer[pidx + 0] = cvAlpha;
+                            break;
+                        }
+                        case frame::colormap::RGB: {
+                            colorBuffer[pidx + 1] = cvColor.x;
+                            colorBuffer[pidx + 2] = cvColor.y;
+                            colorBuffer[pidx + 3] = cvColor.z;
+                            break;
+                        }
+                        case frame::colormap::BGR: {
+                            colorBuffer[pidx + 3] = cvColor.x;
+                            colorBuffer[pidx + 2] = cvColor.y;
+                            colorBuffer[pidx + 1] = cvColor.z;
+                            break;
+                        }
+                        case frame::colormap::B: {
+                            colorBuffer[pidx] = (cvColor.x * 0.299) + (cvColor.y * 0.587) + (cvColor.z * 0.114);
+                            break;
+                        }
+                    }
+                }
+            }
+            layerFrame.setData(colorBuffer);
+            //layerFrame.compressFrameLZ78();
+            outframes.emplace_back(layerFrame);   
+        }
+        return outframes;
+    }
+    
  
 };
 //#include "g3_serialization.hpp" needed to be usable

util/noise/pnoise2.hpp

@@ -62,6 +62,30 @@ private:
         permutation.insert(permutation.end(), permutationt.begin(), permutationt.end());
         permutation.insert(permutation.end(), permutationt.begin(), permutationt.end());
     }
+
+    float normalizedNoise(const Vec2<float>& point) {
+        return (permute(point) + 1.0f) * 0.5f;
+    }
+
+    float mapRange(float value, float inMin, float inMax, float outMin, float outMax) {
+        return (value - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
+    }
+
+    float blendNoises(float noise1, float noise2, float blendFactor) {
+        return lerp(noise1, noise2, blendFactor);
+    }
+
+    float addNoises(float noise1, float noise2) {
+        return std::clamp(noise1 + noise2, -1.0f, 1.0f);
+    }
+
+    float multiplyNoises(float noise1, float noise2) {
+        return noise1 * noise2;
+    }
+
+    float hash(int x, int y) {
+        return (permutation[(x + permutation[y & 255]) & 255] / 255.0f) * 2.0f - 1.0f;
+    }
 public:
     PNoise2() : rng(std::random_device{}()) {
         initializePermutation();
@@ -74,8 +98,8 @@ public:
     template<typename T>
     float permute(Vec2<T> point) {
         TIME_FUNCTION;
-        float x = point.x;
-        float y = point.y;
+        float x = static_cast<float>(point.x);
+        float y = static_cast<float>(point.y);
         int X = (int)floor(x);
         int xmod = X & 255;
         int Y = (int)floor(point.y);
@@ -166,6 +190,34 @@ public:
         return retval;
     }
 
+    float valueNoise(const Vec2<float>& point) {
+        int xi = (int)std::floor(point.x);
+        int yi = (int)std::floor(point.y);
+        
+        float tx = point.x - xi;
+        float ty = point.y - yi;
+        
+        int rx0 = xi & 255;
+        int rx1 = (xi + 1) & 255;
+        int ry0 = yi & 255;
+        int ry1 = (yi + 1) & 255;
+        
+        // Random values at corners
+        float c00 = hash(rx0, ry0);
+        float c10 = hash(rx1, ry0);
+        float c01 = hash(rx0, ry1);
+        float c11 = hash(rx1, ry1);
+        
+        // Interpolation
+        float sx = fade(tx);
+        float sy = fade(ty);
+        
+        float nx0 = lerp(c00, c10, sx);
+        float nx1 = lerp(c01, c11, sx);
+        
+        return lerp(nx0, nx1, sy);
+    }
+
     Vec4ui8 permuteColor(const Vec3<float>& point) {
         TIME_FUNCTION;
         float noiseR = permute(point);
@@ -188,6 +240,65 @@ public:
         return Vec4ui8(r, g, b, a);
     }
 
+    template<typename T>
+    float fractalNoise(const Vec2<T>& point, int octaves, float persistence, float lacunarity) {
+        float total = 0.0f;
+        float frequency = 1.f;
+        float amplitude = 1.f;
+        float maxV = 0.f;
+        for (int i = 0; i < octaves; i++) {
+            total += permute(point*frequency) * amplitude;
+            maxV += amplitude;
+            amplitude *= persistence;
+            frequency *= lacunarity;
+        }
+
+        return total / maxV;
+    }
+
+    template<typename T>
+    float turbulence(const Vec2<T>& point, int octaves) {
+        float value = 0.0f;
+        Vec2<float> tempPoint = point;
+        for (int i = 0; i < octaves; i++) {
+            value += std::abs(permute(tempPoint));
+            tempPoint *= 2.f;
+        }
+        return value;
+    }
+
+    float ridgedNoise(const Vec2<float>& point, int octaves, float offset = 1.0f) {
+        float result = 0.f;
+        float weight = 1.f;
+        Vec2<float> p = point;
+        
+        for (int i = 0; i < octaves; i++) {
+            float signal = 1.f - std::abs(permute(p));
+            signal *= signal;
+            signal *= weight;
+            weight = signal * offset;
+            result += signal;
+            p *= 2.f;
+        }
+        
+        return result;
+    }
+
+    float billowNoise(const Vec2<float>& point, int octaves) {
+        float value = 0.0f;
+        float amplitude = 1.0f;
+        float frequency = 1.0f;
+        
+        for (int i = 0; i < octaves; i++) {
+            value += std::abs(permute(point * frequency)) * amplitude;
+            amplitude *= 0.5f;
+            frequency *= 2.0f;
+        }
+        
+        return value;
+    }
+
+
 };
 
 #endif