graphing

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(graphs VERSION 0.0.16)
+project(graphs VERSION 0.0.17)
 
 option(ENABLE_ADDRSAN "Enable the address sanitizer" OFF)
 option(ENABLE_UBSAN "Enable the ub sanitizer" OFF)

embuild.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
+mkdir cmake-build-emrelwithdebinfo
 cd cmake-build-emrelwithdebinfo
 emcmake cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ../
 #emcmake cmake -DCMAKE_BUILD_TYPE=Release ../
 emmake make -j 16
-cp graphs.js graphs.data graphs.wasm /var/www/html
+cp graphs.js graphs.data graphs.wasm /var/www/html/playground/

lib/BLT-With-Graphics-Template

@@ -1 +1 @@
-Subproject commit 0233ce7549f5d0ef1df53157ed102e48f25c954e
+Subproject commit 99715470eefa6d8192ab44f7355187848070031a

src/main.cpp

@@ -21,12 +21,341 @@
 #include "blt/gfx/renderer/camera.h"
 #include <blt/gfx/framebuffer.h>
 #include <imgui.h>
+#include <random>
+#include <blt/std/ranges.h>
+#include <blt/std/assert.h>
+#include <blt/std/time.h>
+#include <blt/math/log_util.h>
 
 blt::gfx::matrix_state_manager global_matrices;
 blt::gfx::resource_manager resources;
 blt::gfx::batch_renderer_2d renderer_2d(resources);
-blt::gfx::first_person_camera camera;
+blt::gfx::first_person_camera_2d camera;
 blt::gfx::fbo_t render_texture;
+blt::u64 lastTime;
+double ft = 0;
+double fps = 0;
+int sub_ticks = 1;
+
+namespace im = ImGui;
+
+class node
+{
+    private:
+        blt::gfx::point2d_t point;
+        blt::vec2 velocity;
+    public:
+        explicit node(const blt::gfx::point2d_t& point): point(point)
+        {}
+        
+        blt::vec2& getVelocityRef()
+        {
+            return velocity;
+        }
+        
+        blt::vec2& getPositionRef()
+        {
+            return point.pos;
+        }
+        
+        [[nodiscard]] const blt::vec2& getPosition() const
+        {
+            return point.pos;
+        }
+        
+        [[nodiscard]] auto& getRenderObj() const
+        {
+            return point;
+        }
+};
+
+
+class edge
+{
+    private:
+        blt::size_t i1, i2;
+    public:
+        edge(blt::size_t i1, blt::size_t i2): i1(i1), i2(i2)
+        {
+            BLT_ASSERT(i1 != i2 && "Indices cannot be equal!");
+        }
+        
+        inline friend bool operator==(edge e1, edge e2)
+        {
+            return (e1.i1 == e2.i1 || e1.i1 == e2.i2) && (e1.i2 == e2.i1 || e1.i2 == e2.i2);
+        }
+        
+        [[nodiscard]] size_t getFirst() const
+        {
+            return i1;
+        }
+        
+        [[nodiscard]] size_t getSecond() const
+        {
+            return i2;
+        }
+};
+
+struct edge_hash
+{
+    blt::u64 operator()(const edge& e) const
+    {
+        return e.getFirst() * e.getSecond();
+    }
+};
+
+class graph
+{
+    private:
+        std::vector<node> nodes;
+        blt::hashset_t<edge, edge_hash> edges;
+        blt::hashmap_t<blt::u64, blt::hashset_t<blt::u64>> connected_nodes;
+        bool sim = false;
+        float sim_speed = 1;
+        float threshold = 0.01;
+        float max_force_last = 1;
+        float repulsive_constant = 12.0;
+        float spring_constant = 24.0;
+        float ideal_spring_length = 175.0;
+        float initial_temperature = 69.5;
+        float cooling_rate = 0.999;
+        int current_iterations = 0;
+        int max_iterations = 5000;
+        static constexpr float POINT_SIZE = 35;
+        
+        [[nodiscard]] blt::vec2 attr(const std::pair<blt::size_t, node>& v1, const std::pair<blt::size_t, node>& v2) const
+        {
+            auto dir = v2.second.getPosition() - v1.second.getPosition();
+            auto mag = dir.magnitude();
+            auto unit = mag == 0 ? blt::vec2() : dir / mag;
+            
+            auto ideal = std::log(mag / ideal_spring_length);
+            
+            return spring_constant * ideal * unit;
+        }
+        
+        [[nodiscard]] blt::vec2 rep(const std::pair<blt::size_t, node>& v1, const std::pair<blt::size_t, node>& v2) const
+        {
+            auto dir = v2.second.getPosition() - v1.second.getPosition();
+            auto mag = dir.magnitude();
+            auto unit = mag == 0 ? blt::vec2() : dir / mag;
+            auto mag_sq = mag * mag;
+            
+            auto scale = repulsive_constant / mag_sq;
+            return scale * unit;
+        }
+        
+        [[nodiscard]] float cooling_factor() const
+        {
+            return static_cast<float>(initial_temperature * std::pow(cooling_rate, current_iterations));
+        }
+        
+        void create_random_graph(blt::i32 width, blt::i32 height, blt::size_t min_nodes, blt::size_t max_nodes, blt::f64 connectivity)
+        {
+            // don't allow points too close to the edges of the window.
+            width -= POINT_SIZE;
+            height -= POINT_SIZE;
+            static std::random_device dev;
+            static std::uniform_real_distribution chance(0.0, 1.0);
+            std::uniform_int_distribution node_count_dist(min_nodes, max_nodes);
+            std::uniform_real_distribution pos_x_dist(POINT_SIZE, static_cast<blt::f32>(width));
+            std::uniform_real_distribution pos_y_dist(POINT_SIZE, static_cast<blt::f32>(height));
+            
+            auto node_count = node_count_dist(dev);
+            
+            for (blt::size_t i = 0; i < node_count; i++)
+            {
+                float x, y;
+                do
+                {
+                    bool can_break = true;
+                    x = pos_x_dist(dev);
+                    y = pos_y_dist(dev);
+                    for (const auto& node : nodes)
+                    {
+                        const auto& rp = node.getRenderObj().pos;
+                        float dx = rp.x() - x;
+                        float dy = rp.y() - y;
+                        float dist = std::sqrt(dx * dx + dy * dy);
+                        
+                        if (dist <= POINT_SIZE)
+                        {
+                            can_break = false;
+                            break;
+                        }
+                    }
+                    if (can_break)
+                        break;
+                } while (true);
+                nodes.push_back(node({x, y, POINT_SIZE}));
+            }
+            
+            for (const auto& node1 : blt::enumerate(nodes))
+            {
+                for (const auto& node2 : blt::enumerate(nodes))
+                {
+                    if (node1.first == node2.first)
+                        continue;
+                    if (chance(dev) <= connectivity)
+                        connect(node1.first, node2.first);
+                }
+            }
+            
+            std::uniform_int_distribution node_select_dist(0ul, nodes.size() - 1);
+            for (blt::size_t i = 0; i < nodes.size(); i++)
+            {
+                if (connected_nodes[i].size() <= 1)
+                {
+                    for (blt::size_t j = connected_nodes[i].size(); j < 2; j++)
+                    {
+                        blt::u64 select;
+                        do
+                        {
+                            select = node_select_dist(dev);
+                            if (select != i && !connected_nodes[i].contains(select))
+                                break;
+                        } while (true);
+                        connect(i, select);
+                    }
+                }
+            }
+        }
+    
+    public:
+        graph() = default;
+        
+        graph(blt::i32 width, blt::i32 height, blt::size_t min_nodes, blt::size_t max_nodes, blt::f64 connectivity)
+        {
+            create_random_graph(width, height, min_nodes, max_nodes, connectivity);
+        }
+        
+        void reset(blt::i32 width, blt::i32 height, blt::size_t min_nodes, blt::size_t max_nodes, blt::f64 connectivity)
+        {
+            sim = false;
+            current_iterations = 0;
+            max_force_last = 1.0;
+            nodes.clear();
+            edges.clear();
+            connected_nodes.clear();
+            create_random_graph(width, height, min_nodes, max_nodes, connectivity);
+        }
+        
+        void connect(blt::u64 n1, blt::u64 n2)
+        {
+            edges.insert(edge{n1, n2});
+            connected_nodes[n1].insert(n2);
+            connected_nodes[n2].insert(n1);
+        }
+        
+        [[nodiscard]] bool connected(blt::u64 e1, blt::u64 e2) const
+        {
+            return edges.contains({e1, e2});
+        }
+        
+        void render(double frame_time)
+        {
+            if (sim && current_iterations < max_iterations && max_force_last > threshold)
+            {
+                for (int _ = 0; _ < sub_ticks; _++)
+                {
+                    // calculate new forces
+                    for (const auto& v1 : blt::enumerate(nodes))
+                    {
+                        blt::vec2 attractive;
+                        blt::vec2 repulsive;
+                        for (const auto& v2 : blt::enumerate(nodes))
+                        {
+                            if (v1.first == v2.first)
+                                continue;
+                            attractive += attr(v1, v2);
+                            repulsive += rep(v1, v2);
+                        }
+                        v1.second.getVelocityRef() = attractive + repulsive;
+                    }
+                    max_force_last = 0;
+                    // update positions
+                    for (auto& v : nodes)
+                    {
+                        v.getPositionRef() += v.getVelocityRef() * cooling_factor() * static_cast<float>(frame_time * sim_speed) * 0.05f;
+                        max_force_last = std::max(max_force_last, v.getVelocityRef().magnitude());
+                    }
+                    current_iterations++;
+                }
+            }
+            
+            for (const auto& point : nodes)
+                renderer_2d.drawPointInternal("parker", point.getRenderObj(), 10.0f);
+            for (const auto& edge : edges)
+            {
+                if (edge.getFirst() >= nodes.size() || edge.getSecond() >= nodes.size())
+                {
+                    BLT_WARN("Edge Error %ld %ld %ld", edge.getFirst(), edge.getSecond(), nodes.size());
+                } else
+                {
+                    auto n1 = nodes[edge.getFirst()];
+                    auto n2 = nodes[edge.getSecond()];
+                    renderer_2d.drawLine(blt::make_color(0, 1, 0), 5.0f, n1.getRenderObj().pos, n2.getRenderObj().pos, 2.0f);
+                }
+            }
+        }
+        
+        void start_sim()
+        {
+            sim = true;
+        }
+        
+        void stop_sim()
+        {
+            sim = false;
+        }
+        
+        float& getSimSpeed()
+        {
+            return sim_speed;
+        }
+        
+        float& getThreshold()
+        {
+            return threshold;
+        }
+        
+        float& getSpringConstant()
+        {
+            return spring_constant;
+        }
+        
+        float& getInitialTemperature()
+        {
+            return initial_temperature;
+        }
+        
+        float& getCoolingRate()
+        {
+            return cooling_rate;
+        }
+        
+        float& getIdealSpringLength()
+        {
+            return ideal_spring_length;
+        }
+        
+        float& getRepulsionConstant()
+        {
+            return repulsive_constant;
+        }
+        
+        int& getMaxIterations()
+        {
+            return max_iterations;
+        }
+        
+        [[nodiscard]] int numberOfNodes() const
+        {
+            return static_cast<int>(nodes.size());
+        }
+};
+
+graph main_graph;
 
 #ifdef __EMSCRIPTEN__
 std::string resource_prefix = "../";
@@ -34,7 +363,7 @@ blt::gfx::fbo_t render_texture;
 std::string resource_prefix = "../";
 #endif
 
-void init(const blt::gfx::window_context& context)
+void init(const blt::gfx::window_data& data)
 {
     using namespace blt::gfx;
     resources.setPrefixDirectory(resource_prefix);
@@ -47,8 +376,11 @@ void init(const blt::gfx::window_context& context)
     resources.load_resources();
     renderer_2d.create();
     
+    main_graph = graph(data.width, data.height, 5, 25, 0.2);
+    lastTime = blt::system::nanoTime();
+    
     //render_texture = fbo_t::make_multisample_render_texture(1440, 720, 4);
-    render_texture = fbo_t::make_multisample_render_target(1440, 720, 8);
+    //render_texture = fbo_t::make_multisample_render_target(1440, 720, 8);
     //render_texture = fbo_t::make_render_target(1440, 720);
     //render_texture = fbo_t::make_render_texture(1440, 720);
 }
@@ -57,16 +389,9 @@ float x = 50, y = 50;
 float sx = 0.5, sy = 0.5;
 float ax = 0.05, ay = 0.05;
 
-void update(const blt::gfx::window_context& context, std::int32_t width, std::int32_t height)
+void update(const blt::gfx::window_data& data)
 {
-    /*render_texture.bind();
-    if (width != render_texture.getWidth() || height != render_texture.getHeight())
-    {
-        //BLT_TRACE("updating from %d %d to %d %d", render_texture.getWidth(), render_texture.getHeight(), width, height);
-        render_texture.updateBuffersStorage(width, height);
-    }
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);*/
-    global_matrices.update_perspectives(width, height, 90, 0.1, 2000);
+    global_matrices.update_perspectives(data.width, data.height, 90, 0.1, 2000);
     
     x += sx;
     y += sx;
@@ -79,22 +404,68 @@ void update(const blt::gfx::window_context& context, std::int32_t width, std::in
     if (y > 256)
         sy *= -1;
     
-    renderer_2d.drawLine(blt::vec4{1, 0, 1, 1}, 0.0f, blt::vec2{x,y}, blt::vec2{500, 500}, 5.0f);
-    renderer_2d.drawLine(blt::vec4{1, 0, 0, 1}, 0.0f, blt::vec2{0,150}, blt::vec2{240, 0}, 12.0f);
-    renderer_2d.drawPoint(blt::vec4{0, 1, 0, 1}, 1.0f, blt::vec2{500, 500}, 50.0f);
-    renderer_2d.drawPoint("parkercat", 1.0f, blt::vec2{800, 500}, 256.0f);
-    //renderer_2d.drawRectangle(blt::vec4{1,1,1,1}, -1.0f, blt::vec2{width / 2.0, height / 2.0}, blt::vec2{width, height});
+    //im::ShowDemoWindow();
+    if (im::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize))
+    {
+        static int min_nodes = 5;
+        static int max_nodes = 25;
+        static float connectivity = 0.12;
+        
+        //im::SetNextItemOpen(true, ImGuiCond_Once);
+        im::Text("FPS: %lf Frame-time (ms): %lf Frame-time (S): %lf", fps, ft * 1000.0, ft);
+        im::Text("Number of Nodes: %d", main_graph.numberOfNodes());
+        if (im::CollapsingHeader("Graph Generation Settings"))
+        {
+            im::InputInt("Min Nodes", &min_nodes);
+            im::InputInt("Max Nodes", &max_nodes);
+            im::SliderFloat("Connectivity", &connectivity, 0, 1);
+            if (im::Button("Reset Graph"))
+            {
+                main_graph.reset(data.width, data.height, min_nodes, max_nodes, connectivity);
+            }
+        }
+        im::SetNextItemOpen(true, ImGuiCond_Once);
+        if (im::CollapsingHeader("Simulation Settings"))
+        {
+            im::InputInt("Max Iterations", &main_graph.getMaxIterations());
+            im::InputInt("Sub-ticks Per Frame", &sub_ticks);
+            im::InputFloat("Threshold", &main_graph.getThreshold(), 0.01, 1);
+            im::InputFloat("Repulsive Constant", &main_graph.getRepulsionConstant(), 0.25, 10);
+            im::InputFloat("Spring Constant", &main_graph.getSpringConstant(), 0.25, 10);
+            im::InputFloat("Ideal Spring Length", &main_graph.getIdealSpringLength(), 2.5, 10);
+            im::SliderFloat("Initial Temperature", &main_graph.getInitialTemperature(), 1, 100);
+            im::SliderFloat("Cooling Rate", &main_graph.getCoolingRate(), 0, 0.999999, "%.6f");
+            im::SliderFloat("Simulation Speed", &main_graph.getSimSpeed(), 0, 4);
+            if (im::Button("Start"))
+                main_graph.start_sim();
+            im::SameLine();
+            if (im::Button("Stop"))
+                main_graph.stop_sim();
+        }
+        im::End();
+    }
+    
+    //renderer_2d.drawLine(blt::vec4{1, 0, 1, 1}, 0.0f, blt::vec2{x, y}, blt::vec2{500, 500}, 5.0f);
+    //renderer_2d.drawLine(blt::vec4{1, 0, 0, 1}, 0.0f, blt::vec2{0, 150}, blt::vec2{240, 0}, 12.0f);
+    //renderer_2d.drawPoint(blt::vec4{0, 1, 0, 1}, 1.0f, blt::vec2{500, 500}, 50.0f);
+    //renderer_2d.drawPoint("parkercat", 1.0f, blt::vec2{800, 500}, 256.0f);
+    
+    main_graph.render(ft);
     
     camera.update();
     camera.update_view(global_matrices);
     global_matrices.update();
     
     renderer_2d.render();
-    //blt::gfx::fbo_t::unbind();
-    //render_texture.blitToScreen(width, height);
+    
+    auto currentTime = blt::system::nanoTime();
+    auto diff = currentTime - lastTime;
+    lastTime = currentTime;
+    ft = static_cast<double>(diff) / 1000000000.0;
+    fps = 1 / ft;
 }
 
-int main(int argc, const char** argv)
+int main(int, const char**)
 {
     blt::gfx::init(blt::gfx::window_data{"My Sexy Window", init, update, 1440, 720}.setSyncInterval(1));
     global_matrices.cleanup();