Migrate to NanoGUI / Eigen for GUI and linear algebra.

Also introduce a GUI play/pause button.

CMakeLists.txt

@@ -6,13 +6,13 @@ set(CMAKE_CXX_STANDARD 17)
 add_subdirectory(vendor/toddcox)
 
 add_subdirectory(vendor/yaml-cpp)
-add_subdirectory(vendor/cgl)
-#add_subdirectory(vendor/glfw)
 
 set(NANOGUI_BUILD_EXAMPLE OFF CACHE BOOL " " FORCE)
 set(NANOGUI_BUILD_PYTHON  OFF CACHE BOOL " " FORCE)
 set(NANOGUI_INSTALL       OFF CACHE BOOL " " FORCE)
+set(NANOGUI_USE_GLAD      ON  CACHE BOOL " " FORCE)
 add_subdirectory(vendor/nanogui)
+set_property(TARGET glfw glfw_objects nanogui PROPERTY FOLDER "dependencies")
 
 add_subdirectory(vis)
 

vis/CMakeLists.txt

@@ -12,12 +12,10 @@ add_custom_command(
         COMMENT "copied preses"
 )
 
-add_executable(vis src/main.cpp)
-target_include_directories(vis PRIVATE include)
-target_link_libraries(vis PRIVATE tc glfw yaml-cpp cgl glad)
-add_dependencies(vis shaders presets)
+add_definitions(${NANOGUI_EXTRA_DEFS})
+include_directories(${NANOGUI_EXTRA_INCS})
 
 add_executable(vis-gui src/main-gui.cpp)
 target_include_directories(vis-gui PRIVATE include)
-target_link_libraries(vis-gui PRIVATE tc nanogui)
+target_link_libraries(vis-gui PRIVATE tc nanogui yaml-cpp ${NANOGUI_EXTRA_LIBS})
 add_dependencies(vis-gui shaders presets)

vis/include/cgl/buffer.hpp

@@ -0,0 +1,78 @@
+#pragma once
+
+#include <memory>
+
+#include <nanogui/opengl.h>
+
+namespace cgl {
+    template<class T>
+    class Buffer {
+        GLuint id{};
+
+    public:
+        Buffer() {
+            glCreateBuffers(1, &id);
+        }
+
+        Buffer(const T &data, GLenum usage = GL_STATIC_DRAW)
+            : Buffer() {
+            put(data, usage);
+        }
+
+        Buffer(const std::vector<T> &data, GLenum usage = GL_STATIC_DRAW)
+            : Buffer() {
+            put(data, usage);
+        }
+
+        Buffer(const Buffer &) = delete;
+
+        Buffer(Buffer &&o) noexcept {
+            id = std::exchange(o.id, 0);
+        };
+
+        ~Buffer() {
+            glDeleteBuffers(1, &id);
+            id = 0;
+        }
+
+        operator GLuint() const {
+            return id;
+        }
+
+        [[nodiscard]] size_t size() const {
+            GLint res;
+            glGetNamedBufferParameteriv(id, GL_BUFFER_SIZE, &res);
+            return (size_t) res;
+        }
+
+        [[nodiscard]] size_t count() const {
+            return size() / sizeof(T);
+        }
+
+        void put(const T &data, GLenum usage = GL_STATIC_DRAW) {
+            glNamedBufferData(id, sizeof(T), &data, usage);
+        }
+
+        void put(const std::vector<T> &data, GLenum usage = GL_STATIC_DRAW) {
+            glNamedBufferData(id, sizeof(T) * data.size(), &data[0], usage);
+        }
+
+        void bound(GLenum target, const std::function<void()> &action) const {
+            glBindBuffer(target, id);
+            action();
+            glBindBuffer(target, 0);
+        }
+
+        std::vector<T> getSubData(size_t offset, size_t count) const {
+            GLintptr glOffset = offset * sizeof(T);
+            GLsizeiptr glSize = count * sizeof(T);
+
+            std::vector<T> data(count);
+
+            glad_glGetNamedBufferSubData(id, glOffset, glSize, data.data());
+
+            return data;
+        }
+    };
+
+}

vis/include/cgl/error.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <stdexcept>
+
+#include <nanogui/opengl.h>
+
+namespace cgl {
+    class GlError : public std::domain_error {
+    public:
+        explicit GlError(const std::string &arg) : domain_error(arg) {}
+
+        explicit GlError(const char *string) : domain_error(string) {}
+    };
+
+    class ShaderError : public GlError {
+    public:
+        explicit ShaderError(const std::string &arg) : GlError(arg) {}
+
+        explicit ShaderError(const char *string) : GlError(string) {}
+    };
+
+    class ProgramError : public GlError {
+    public:
+        explicit ProgramError(const std::string &arg) : GlError(arg) {}
+
+        explicit ProgramError(const char *string) : GlError(string) {}
+    };
+}

vis/include/cgl/pipeline.hpp

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <functional>
+#include <string>
+#include <utility>
+
+#include <nanogui/opengl.h>
+
+#include <cgl/error.hpp>
+#include <cgl/shaderprogram.hpp>
+
+#include <util.hpp>
+
+namespace cgl {
+    class pipeline {
+    protected:
+        GLuint id{};
+
+    public:
+        pipeline() {
+            glCreateProgramPipelines(1, &id);
+        }
+
+        pipeline(pipeline &) = delete;
+
+        pipeline(pipeline &&o) noexcept {
+            id = std::exchange(o.id, 0);
+        }
+
+        ~pipeline() {
+            glDeleteProgramPipelines(1, &id);
+            id = 0;
+        }
+
+        operator GLuint() const {
+            return id;
+        }
+
+        [[nodiscard]] int get(GLenum pname) const {
+            GLint res;
+            glGetProgramPipelineiv(id, pname, &res);
+            return (int) res;
+        }
+
+        [[nodiscard]] std::string get_info_log() const {
+            auto len = (size_t) get(GL_INFO_LOG_LENGTH);
+            char buffer[len];
+            glGetProgramPipelineInfoLog(id, len, nullptr, buffer);
+            return std::string(buffer);
+        }
+
+        pipeline &unstage(GLenum stage_bits) {
+            glUseProgramStages(id, stage_bits, 0);
+            return *this;
+        }
+
+        pipeline &stage(const ShaderProgram<GL_VERTEX_SHADER> &pgm) {
+            glUseProgramStages(id, GL_VERTEX_SHADER_BIT, pgm);
+            return *this;
+        }
+
+        pipeline &stage(const ShaderProgram<GL_TESS_CONTROL_SHADER> &pgm) {
+            glUseProgramStages(id, GL_TESS_CONTROL_SHADER_BIT, pgm);
+            return *this;
+        }
+
+        pipeline &stage(const ShaderProgram<GL_TESS_EVALUATION_SHADER> &pgm) {
+            glUseProgramStages(id, GL_TESS_EVALUATION_SHADER_BIT, pgm);
+            return *this;
+        }
+
+        pipeline &stage(const ShaderProgram<GL_GEOMETRY_SHADER> &pgm) {
+            glUseProgramStages(id, GL_GEOMETRY_SHADER_BIT, pgm);
+            return *this;
+        }
+
+        pipeline &stage(const ShaderProgram<GL_FRAGMENT_SHADER> &pgm) {
+            glUseProgramStages(id, GL_FRAGMENT_SHADER_BIT, pgm);
+            return *this;
+        }
+
+        pipeline &stage(const ShaderProgram<GL_COMPUTE_SHADER> &pgm) {
+            glUseProgramStages(id, GL_COMPUTE_SHADER_BIT, pgm);
+            return *this;
+        }
+
+        void bound(const std::function<void()> &action) const {
+            glBindProgramPipeline(id);
+            action();
+            glBindProgramPipeline(0);
+        }
+    };
+}

vis/include/cgl/program.hpp

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <string>
+#include <utility>
+
+#include <nanogui/opengl.h>
+
+#include <cgl/error.hpp>
+#include <cgl/shader.hpp>
+
+#include <util.hpp>
+
+namespace cgl {
+    class Program {
+    protected:
+        GLuint id{};
+
+    public:
+        Program() {
+            id = glCreateProgram();
+        }
+
+        Program(Program &) = delete;
+
+        Program(Program &&o) noexcept {
+            id = std::exchange(o.id, 0);
+        };
+
+        ~Program() {
+            glDeleteProgram(id);
+        }
+
+        operator GLuint() const {
+            return id;
+        }
+
+        [[nodiscard]] int get(GLenum pname) const {
+            GLint res;
+            glGetProgramiv(id, pname, &res);
+            return (int) res;
+        }
+
+        [[nodiscard]] std::string get_info_log() const {
+            auto len = (size_t) get(GL_INFO_LOG_LENGTH);
+            char buffer[len];
+            glGetProgramInfoLog(id, len, nullptr, buffer);
+            return std::string(buffer);
+        }
+
+        template<GLenum mode>
+        void attach(const Shader<mode> &sh) {
+            glAttachShader(id, sh);
+        }
+
+        template<GLenum mode>
+        void detach(const Shader<mode> &sh) {
+            glDetachShader(id, sh);
+        }
+
+        bool link() {
+            glLinkProgram(id);
+            return (bool) get(GL_LINK_STATUS);
+        }
+    };
+}

vis/include/cgl/shader.hpp

@@ -0,0 +1,80 @@
+#pragma once
+
+#include <string>
+#include <utility>
+
+#include <nanogui/opengl.h>
+
+#include <cgl/error.hpp>
+
+#include <util.hpp>
+
+namespace cgl {
+    template<GLenum mode>
+    class Shader {
+    protected:
+        GLuint id{};
+
+    public:
+        Shader() {
+            id = glCreateShader(mode);
+        }
+
+        Shader(const std::string &src) : Shader() {
+            set_source(src);
+
+            if (!compile())
+                throw ShaderError(get_info_log());
+        }
+
+        static Shader<mode> file(const std::string &name) {
+            return Shader<mode>(utilReadFile(name));
+        }
+
+        Shader(Shader &) = delete;
+
+        Shader(Shader &&o) noexcept {
+            id = std::exchange(o.id, 0);
+        };
+
+        ~Shader() {
+            glDeleteShader(id);
+        }
+
+        operator GLuint() const {
+            return id;
+        }
+
+        [[nodiscard]] int get(GLenum pname) const {
+            GLint res;
+            glGetShaderiv(id, pname, &res);
+            return (int) res;
+        }
+
+        [[nodiscard]] std::string get_info_log() const {
+            auto len = (size_t) get(GL_INFO_LOG_LENGTH);
+            char buffer[len];
+            glGetShaderInfoLog(id, len, nullptr, buffer);
+            return std::string(buffer);
+        }
+
+        void set_source(const std::string &src) {
+            const char *c_src = src.c_str();
+            glShaderSource(id, 1, &c_src, nullptr);
+        }
+
+        bool compile() {
+            glCompileShader(id);
+            return (bool) get(GL_COMPILE_STATUS);
+        }
+    };
+
+    namespace sh {
+        using vert = Shader<GL_VERTEX_SHADER>;
+        using tcs = Shader<GL_TESS_CONTROL_SHADER>;
+        using tes = Shader<GL_TESS_EVALUATION_SHADER>;
+        using geom = Shader<GL_GEOMETRY_SHADER>;
+        using frag = Shader<GL_FRAGMENT_SHADER>;
+        using comp = Shader<GL_COMPUTE_SHADER>;
+    }
+}

vis/include/cgl/shaderprogram.hpp

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <string>
+#include <utility>
+
+#include <nanogui/opengl.h>
+
+#include <cgl/error.hpp>
+#include <cgl/shader.hpp>
+#include <cgl/program.hpp>
+
+#include <util.hpp>
+
+namespace cgl{
+    template<GLenum mode>
+    class ShaderProgram : public Program {
+    public:
+        ShaderProgram() : Program() {
+            glProgramParameteri(id, GL_PROGRAM_SEPARABLE, GL_TRUE);
+        }
+
+        ShaderProgram(const std::string &src) : ShaderProgram() {
+            Shader<mode> sh(src);
+
+            attach(sh);
+
+            if (!link())
+                throw ShaderError(get_info_log());
+
+            detach(sh);
+        }
+
+        static ShaderProgram<mode> file(const std::string &name) {
+            return ShaderProgram<mode>(utilReadFile(name));
+        }
+    };
+
+    namespace pgm {
+        using vert = ShaderProgram<GL_VERTEX_SHADER>;
+        using tcs = ShaderProgram<GL_TESS_CONTROL_SHADER>;
+        using tes = ShaderProgram<GL_TESS_EVALUATION_SHADER>;
+        using geom = ShaderProgram<GL_GEOMETRY_SHADER>;
+        using frag = ShaderProgram<GL_FRAGMENT_SHADER>;
+        using comp = ShaderProgram<GL_COMPUTE_SHADER>;
+    }
+}

vis/include/cgl/vertexarray.hpp

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <functional>
+#include <string>
+#include <utility>
+
+#include <nanogui/opengl.h>
+
+#include <cgl/error.hpp>
+#include <cgl/buffer.hpp>
+
+namespace cgl {
+    class VertexArray {
+        GLuint id{};
+
+    public:
+        VertexArray() {
+            glCreateVertexArrays(1, &id);
+        }
+
+        VertexArray(VertexArray &) = delete;
+
+        VertexArray(VertexArray &&o) noexcept {
+            id = std::exchange(o.id, 0);
+        }
+
+        ~VertexArray() {
+            glDeleteVertexArrays(1, &id);
+            id = 0;
+        }
+
+        operator GLuint() const {
+            return id;
+        }
+
+        void bound(const std::function<void()> &action) const {
+            glBindVertexArray(id);
+            action();
+            glBindVertexArray(0);
+        }
+
+        template<class T>
+        void pointer(
+            GLuint index,
+            const Buffer<T> &buf,
+            unsigned size,
+            GLenum type,
+            bool normalized = false,
+            unsigned stride = 0
+        ) const {
+            bound([&]() {
+                glEnableVertexAttribArray(index);
+                buf.bound(GL_ARRAY_BUFFER, [&]() {
+                    glVertexAttribPointer(index, size, type, normalized, stride, nullptr);
+                });
+            });
+        }
+
+        template<class T>
+        void ipointer(
+            GLuint index,
+            const Buffer<T> &buf,
+            unsigned size,
+            GLenum type,
+            unsigned stride = 0
+        ) const {
+            bound([&]() {
+                glEnableVertexAttribArray(index);
+                buf.bound(GL_ARRAY_BUFFER, [&]() {
+                    glVertexAttribIPointer(index, size, type, stride, nullptr);
+                });
+            });
+        }
+    };
+}

vis/include/mirror.hpp

@@ -6,8 +6,12 @@
 #include <vector>
 #include <algorithm>
 
-template<unsigned N>
-using vec = std::array<float, N>;
+#include <nanogui/glutil.h>
+
+template<int N>
+using vec = Eigen::Matrix<float, N, 1>;
+template<int N>
+using mat = Eigen::Matrix<float, N, N>;
 
 using vec1 = vec<1>;
 using vec2 = vec<2>;
@@ -15,75 +19,12 @@ using vec3 = vec<3>;
 using vec4 = vec<4>;
 using vec5 = vec<5>;
 
-template<unsigned N>
-using mat = std::array<std::array<float, N>, N>;
-
 using mat1 = mat<1>;
 using mat2 = mat<2>;
 using mat3 = mat<3>;
 using mat4 = mat<4>;
 using mat5 = mat<5>;
 
-template<class V>
-V operator*(V a, const float &b) {
-    for (auto &e : a) e *= b;
-    return a;
-}
-
-template<class V>
-V operator*(const float &b, V a) {
-    for (auto &e : a) e *= b;
-    return a;
-}
-
-template<class V>
-V operator/(V a, const float &b) {
-    for (auto &e : a) e /= b;
-    return a;
-}
-
-template<class V>
-V operator+(const V &a, V b) {
-    for (int i = 0; i < a.size(); ++i) {
-        a[i] += b[i];
-    }
-    return a;
-}
-
-template<class V>
-V operator-(V a, const V &b) {
-    for (int i = 0; i < a.size(); ++i) {
-        a[i] -= b[i];
-    }
-    return a;
-}
-
-template<class V>
-void operator-=(V &a, const V &b) {
-    for (int i = 0; i < a.size(); ++i) {
-        a[i] -= b[i];
-    }
-}
-
-template<class V>
-void operator+=(V &a, const V &b) {
-    for (int i = 0; i < a.size(); ++i) {
-        a[i] += b[i];
-    }
-}
-
-template<class V>
-float length(const V &a) {
-    float sum = 0;
-    for (const auto &e : a) sum += e * e;
-    return sqrtf(sum);
-}
-
-template<class V>
-V normalized(const V &a) {
-    return a / length(a);
-}
-
 template<class V>
 float dot(int n, const V &a, const V &b) {
     float sum = 0;
@@ -93,39 +34,6 @@ float dot(int n, const V &a, const V &b) {
     return sum;
 }
 
-template<class V>
-float dot(const V &a, const V &b) {
-    float sum = 0;
-    for (int i = 0; i < a.size(); ++i) {
-        sum += a[i] * b[i];
-    }
-    return sum;
-}
-
-vec5 mul(vec5 v, mat5 m) {
-    vec5 r{};
-
-    for (int i = 0; i < 5; ++i)
-        for (int j = 0; j < 5; ++j)
-            r[i] += m[i][j] * v[j];
-
-    return r;
-}
-
-mat5 mul(mat5 a, mat5 b) {
-    mat5 r{};
-
-    for (int i = 0; i < 5; ++i) {
-        for (int j = 0; j < 5; ++j) {
-            for (int k = 0; k < 5; ++k) {
-                r[i][j] += a[i][k] * b[k][j];
-            }
-        }
-    }
-
-    return r;
-}
-
 template<unsigned N>
 std::vector<vec<N>> mirror(const tc::Group &group) {
     std::vector<std::vector<float>> mirrors;
@@ -152,7 +60,7 @@ std::vector<vec<N>> mirror(const tc::Group &group) {
 
     std::vector<vec<N>> res;
     for (const auto &v : mirrors) {
-        vec<N> rv{};
+        vec<N> rv = vec<N>::Zero();
 
         // ortho proj
         for (int i = 0; i < std::min(v.size(), (size_t) N); ++i) {
@@ -184,7 +92,7 @@ vec<N> ortho(const vec<N + 1> &v) {
 
 template<class V>
 V project(const V &vec, const V &target) {
-    return dot(vec, target) / dot(target, target) * target;
+    return vec.dot(target) / target.dot(target) * target;
 }
 
 template<class V>
@@ -200,14 +108,14 @@ V gram_schmidt_last(std::vector<V> vecs) {
         }
     }
 
-    return normalized(vecs[vecs.size() - 1]);
+    return vecs[vecs.size() - 1].normalized();
 }
 
 template<class V, class C>
 V barycentric(const std::vector<V> &basis, const C &coords) {
-    V res{};
+    V res = V::Zero();
 
-    int N = std::min(basis.size(), coords.size());
+    int N = std::min((int) basis.size(), (int) coords.rows());
     for (int i = 0; i < N; ++i) {
         res += basis[i] * coords[i];
     }
@@ -226,29 +134,22 @@ std::vector<V> plane_intersections(std::vector<V> normals) {
     return results;
 }
 
-template<unsigned N>
-mat<N> identity() {
-    mat<N> res{};
-    for (int i = 0; i < N; ++i)
-        res[i][i] = 1;
-    return res;
-}
-
 template<unsigned N>
 mat<N> rot(int u, int v, float theta) {
-    auto res = identity<N>();
-    res[u][u] = std::cos(theta);
-    res[u][v] = std::sin(theta);
-    res[v][u] = -std::sin(theta);
-    res[v][v] = std::cos(theta);
+    mat<N> res = mat<N>::Identity();
+    res(u, u) = std::cos(theta);
+    res(u, v) = std::sin(theta);
+    res(v, u) = -std::sin(theta);
+    res(v, v) = std::cos(theta);
     return res;
 }
 
 mat4 ortho(float left, float right, float bottom, float top, float front, float back) {
-    return {
+    mat<4> res = mat4();
+    res <<
         2 / (right - left), 0, 0, -(right + left) / (right - left),
         0, 2 / (top - bottom), 0, -(top + bottom) / (top - bottom),
         0, 0, 2 / (front - back), -(front + back) / (front - back),
-        0, 0, 0, 1,
-    };
+        0, 0, 0, 1;
+    return res;
 }

vis/include/util.hpp

@@ -1,13 +1,13 @@
 #pragma once
 
+#include <nanogui/opengl.h>
+
 #include <cerrno>
 #include <fstream>
 #include <sstream>
 #include <string>
 #include <vector>
 
-#include <glad/glad.h>
-
 std::string utilInfo() {
     std::stringstream ss;
     ss
@@ -19,6 +19,10 @@ std::string utilInfo() {
     return ss.str();
 }
 
+std::string utilGetString(GLenum name) {
+    return reinterpret_cast<char const*>(glGetString(name));
+}
+
 std::string utilReadFile(const std::string &filename) {
     std::ifstream in(filename, std::ios::in | std::ios::binary);
     if (in) {

vis/src/main-gui.cpp

@@ -12,213 +12,159 @@
 */
 
 #include <nanogui/opengl.h>
+#include <nanogui/nanogui.h>
 #include <nanogui/glutil.h>
-#include <nanogui/screen.h>
-#include <nanogui/window.h>
-#include <nanogui/layout.h>
-#include <nanogui/label.h>
-#include <nanogui/checkbox.h>
-#include <nanogui/button.h>
-#include <nanogui/toolbutton.h>
-#include <nanogui/popupbutton.h>
-#include <nanogui/combobox.h>
-#include <nanogui/progressbar.h>
-#include <nanogui/entypo.h>
-#include <nanogui/messagedialog.h>
-#include <nanogui/textbox.h>
-#include <nanogui/slider.h>
-#include <nanogui/imagepanel.h>
-#include <nanogui/imageview.h>
-#include <nanogui/vscrollpanel.h>
-#include <nanogui/colorwheel.h>
-#include <nanogui/graph.h>
-#include <nanogui/tabwidget.h>
-#include <nanogui/glcanvas.h>
+
 #include <iostream>
 #include <string>
 
-// Includes for the GLTexture class.
-#include <cstdint>
-#include <memory>
-#include <utility>
+#include <geometry.hpp>
+#include <solver.hpp>
+#include <rendering.hpp>
+#include <mirror.hpp>
+#include <util.hpp>
+#include <tc/groups.hpp>
 
-#if defined(__GNUC__)
-#  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
-#endif
-#if defined(_WIN32)
-#  pragma warning(push)
-#  pragma warning(disable: 4457 4456 4005 4312)
-#endif
+struct Matrices {
+    mat4 proj = mat4::Identity();
+    mat4 view = mat4::Identity();
 
-#if defined(_WIN32)
-#  pragma warning(pop)
-#endif
-#if defined(_WIN32)
-#  if defined(APIENTRY)
-#    undef APIENTRY
-#  endif
-#  include <windows.h>
-#endif
+    Matrices() = default;
 
-using std::cout;
-using std::cerr;
-using std::endl;
-using std::string;
-using std::vector;
-using std::pair;
-using std::to_string;
+    Matrices(mat4 proj, mat4 view) : proj(std::move(proj)), view(std::move(view)) {}
 
+    static Matrices build(const nanogui::Screen &screen) {
+        auto aspect = (float) screen.width() / (float) screen.height();
+        auto pheight = 1.4f;
+        auto pwidth = aspect * pheight;
+        mat4 proj = ortho(-pwidth, pwidth, -pheight, pheight, -10.0f, 10.0f);
 
-class MyGLCanvas : public nanogui::GLCanvas {
-public:
-  MyGLCanvas(Widget *parent) : nanogui::GLCanvas(parent), mRotation(nanogui::Vector3f(0.25f, 0.5f, 0.33f)) {
-    using namespace nanogui;
+//        if (!glfwGetKey(window, GLFW_KEY_LEFT_SHIFT)) {
+//            state.st += state.time_delta / 8;
+//        }
 
-    mShader.init(
-      /* An identifying name */
-      "a_simple_shader",
-
-      /* Vertex shader */
-      "#version 330\n"
-      "uniform mat4 modelViewProj;\n"
-      "in vec3 position;\n"
-      "in vec3 color;\n"
-      "out vec4 frag_color;\n"
-      "void main() {\n"
-      "    frag_color = 3.0 * modelViewProj * vec4(color, 1.0);\n"
-      "    gl_Position = modelViewProj * vec4(position, 1.0);\n"
-      "}",
-
-      /* Fragment shader */
-      "#version 330\n"
-      "out vec4 color;\n"
-      "in vec4 frag_color;\n"
-      "void main() {\n"
-      "    color = frag_color;\n"
-      "}"
-    );
-
-    MatrixXu indices(3, 12); /* Draw a cube */
-    indices.col( 0) << 0, 1, 3;
-    indices.col( 1) << 3, 2, 1;
-    indices.col( 2) << 3, 2, 6;
-    indices.col( 3) << 6, 7, 3;
-    indices.col( 4) << 7, 6, 5;
-    indices.col( 5) << 5, 4, 7;
-    indices.col( 6) << 4, 5, 1;
-    indices.col( 7) << 1, 0, 4;
-    indices.col( 8) << 4, 0, 3;
-    indices.col( 9) << 3, 7, 4;
-    indices.col(10) << 5, 6, 2;
-    indices.col(11) << 2, 1, 5;
-
-    MatrixXf positions(3, 8);
-    positions.col(0) << -1,  1,  1;
-    positions.col(1) << -1,  1, -1;
-    positions.col(2) <<  1,  1, -1;
-    positions.col(3) <<  1,  1,  1;
-    positions.col(4) << -1, -1,  1;
-    positions.col(5) << -1, -1, -1;
-    positions.col(6) <<  1, -1, -1;
-    positions.col(7) <<  1, -1,  1;
-
-    MatrixXf colors(3, 12);
-    colors.col( 0) << 1, 0, 0;
-    colors.col( 1) << 0, 1, 0;
-    colors.col( 2) << 1, 1, 0;
-    colors.col( 3) << 0, 0, 1;
-    colors.col( 4) << 1, 0, 1;
-    colors.col( 5) << 0, 1, 1;
-    colors.col( 6) << 1, 1, 1;
-    colors.col( 7) << 0.5, 0.5, 0.5;
-    colors.col( 8) << 1, 0, 0.5;
-    colors.col( 9) << 1, 0.5, 0;
-    colors.col(10) << 0.5, 1, 0;
-    colors.col(11) << 0.5, 1, 0.5;
-
-    mShader.bind();
-    mShader.uploadIndices(indices);
-
-    mShader.uploadAttrib("position", positions);
-    mShader.uploadAttrib("color", colors);
+        auto view = mat4::Identity();
+        return Matrices(proj, view);
     }
-
-  ~MyGLCanvas() {
-    mShader.free();
-  }
-
-  void setRotation(nanogui::Vector3f vRotation) {
-    mRotation = vRotation;
-  }
-
-  virtual void drawGL() override {
-    using namespace nanogui;
-
-    mShader.bind();
-
-    Matrix4f mvp;
-    mvp.setIdentity();
-    float fTime = (float)glfwGetTime();
-    mvp.topLeftCorner<3,3>() = Eigen::Matrix3f(Eigen::AngleAxisf(mRotation[0]*fTime, Vector3f::UnitX()) *
-      Eigen::AngleAxisf(mRotation[1]*fTime,  Vector3f::UnitY()) *
-      Eigen::AngleAxisf(mRotation[2]*fTime, Vector3f::UnitZ())) * 0.25f;
-
-    mShader.setUniform("modelViewProj", mvp);
-
-    glEnable(GL_DEPTH_TEST);
-    /* Draw 12 triangles starting at index 0 */
-    mShader.drawIndexed(GL_TRIANGLES, 0, 12);
-    glDisable(GL_DEPTH_TEST);
-  }
-
-private:
-  nanogui::GLShader mShader;
-  Eigen::Vector3f mRotation;
 };
 
+template<class C>
+std::vector<vec4> points(const tc::Group &group, const C &coords, const float time) {
+    auto cosets = group.solve();
+    auto mirrors = mirror<5>(group);
+
+    auto corners = plane_intersections(mirrors);
+    auto start = barycentric(corners, coords);
+
+    auto higher = cosets.path.walk<vec5, vec5>(start, mirrors, reflect<vec5>);
+
+    mat5 r = mat5::Identity();
+    r *= rot<5>(0, 2, time * .21f);
+//    r *= rot<5>(1, 4, time * .27f);
+
+    r *= rot<5>(0, 3, time * .17f);
+    r *= rot<5>(1, 3, time * .25f);
+    r *= rot<5>(2, 3, time * .12f);
+
+    std::transform(higher.begin(), higher.end(), higher.begin(), [&](vec5 v) { return r * v; });
+
+    std::vector<vec4> lower(higher.size());
+    std::transform(higher.begin(), higher.end(), lower.begin(), stereo<4>);
+    return lower;
+}
+
+template<int N, class T, class C>
+Prop<4, vec4> make_slice(
+    const tc::Group &g,
+    const C &coords,
+    vec3 color,
+    T all_sg_gens,
+    const std::vector<std::vector<int>> &exclude
+) {
+    Prop<N, vec4> res{};
+
+//    res.vbo.put(points(g, coords));
+    res.ibo.put(merge<N>(hull<N>(g, all_sg_gens, exclude)));
+    res.vao.ipointer(0, res.ibo, 4, GL_UNSIGNED_INT);
+
+    return res;
+}
 
 class ExampleApplication : public nanogui::Screen {
 public:
-  ExampleApplication() : nanogui::Screen(Eigen::Vector2i(800, 600), "NanoGUI Test", false) {
+    vec5 root;
+    std::unique_ptr<tc::Group> group;
+    std::unique_ptr<Prop<4, vec4>> prop;
+    std::unique_ptr<cgl::Buffer<Matrices>> ubo;
+    std::unique_ptr<SliceRenderer<4, vec4>> ren;
+
+    float glfw_time = 0;
+    float last_frame = 0;
+    float frame_time = 0;
+    float time = 0;
+
+    bool paused = false;
+
+    ExampleApplication() : nanogui::Screen(
+        Eigen::Vector2i(1920, 1080),
+        "Coset Visualization",
+        true, false,
+        8, 8, 24, 8,
+        4,
+        4, 5) {
         using namespace nanogui;
 
-    Window *window = new Window(this, "GLCanvas Demo");
+        Window *window = new Window(this, "Sample Window");
         window->setPosition(Vector2i(15, 15));
-    window->setLayout(new GroupLayout());
+        window->setFixedWidth(250);
+        window->setLayout(new BoxLayout(Orientation::Vertical));
 
-    mCanvas = new MyGLCanvas(window);
-    mCanvas->setBackgroundColor({100, 100, 100, 255});
-    mCanvas->setSize({400, 400});
-
-    Widget *tools = new Widget(window);
-    tools->setLayout(new BoxLayout(Orientation::Horizontal,
-      Alignment::Middle, 0, 5));
-
-    Button *b0 = new Button(tools, "Random Color");
-    b0->setCallback([this]() { mCanvas->setBackgroundColor(Vector4i(rand() % 256, rand() % 256, rand() % 256, 255)); });
-
-    Button *b1 = new Button(tools, "Random Rotation");
-    b1->setCallback([this]() { mCanvas->setRotation(nanogui::Vector3f((rand() % 100) / 100.0f, (rand() % 100) / 100.0f, (rand() % 100) / 100.0f)); });
+        auto pause = new ToolButton(window, ENTYPO_ICON_CONTROLLER_PAUS);
+        pause->setFlags(Button::ToggleButton);
+        pause->setChangeCallback([&](bool value) { this->paused = value; });
 
         performLayout();
+
+        std::cout << utilInfo();
+
+        std::vector<int> symbol = {5, 3, 3, 2};
+        root << .80, .02, .02, .02, .02;
+
+        group = std::make_unique<tc::Group>(tc::schlafli(symbol));
+        auto gens = generators(*group);
+        std::vector<std::vector<int>> exclude = {{0, 1, 2}};
+        auto combos = Combos<int>(gens, 3);
+
+        prop = std::make_unique<Prop<4, vec4>>(make_slice<4>(*group, root, {}, combos, exclude));
+
+        ubo = std::make_unique<cgl::Buffer<Matrices>>();
+        glBindBufferBase(GL_UNIFORM_BUFFER, 1, *ubo);
+
+        ren = std::make_unique<SliceRenderer<4, vec4>>();
     }
 
-  virtual bool keyboardEvent(int key, int scancode, int action, int modifiers) {
-    if (Screen::keyboardEvent(key, scancode, action, modifiers))
-      return true;
-    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
-      setVisible(false);
-      return true;
-    }
-    return false;
-  }
+    void drawContents() override {
+        glEnable(GL_DEPTH_TEST);
 
-  virtual void draw(NVGcontext *ctx) {
-    /* Draw the user interface */
-    Screen::draw(ctx);
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+
+        glViewport(0, 0, width(), height());
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        glfw_time = (float) glfwGetTime();
+        frame_time = glfw_time - last_frame;
+        last_frame = glfw_time;
+        if (!paused) time += frame_time;
+
+        std::get<0>(prop->vbos).put(points(*group, root, time));
+
+        Matrices mats = Matrices::build(*this);
+        ubo->put(mats);
+        ren->draw(*prop);
     }
-private:
-  MyGLCanvas *mCanvas;
 };
 
 int main(int /* argc */, char ** /* argv */) {
@@ -229,17 +175,13 @@ int main(int /* argc */, char ** /* argv */) {
             nanogui::ref<ExampleApplication> app = new ExampleApplication();
             app->drawAll();
             app->setVisible(true);
-      nanogui::mainloop();
+            nanogui::mainloop(1);
         }
 
         nanogui::shutdown();
     } catch (const std::runtime_error &e) {
         std::string error_msg = std::string("Caught a fatal error: ") + std::string(e.what());
-#if defined(_WIN32)
-    MessageBoxA(nullptr, error_msg.c_str(), NULL, MB_ICONERROR | MB_OK);
-#else
-    std::cerr << error_msg << endl;
-#endif
+        std::cerr << error_msg << std::endl;
         return -1;
     }