Merge branch 'end'

game/CMakeLists.txt

@@ -10,8 +10,10 @@ set(GAME_SRC
     glclasses.cpp
     renderer.cpp
     game_window.cpp
-    triangle_window.cpp
+    renderer_simple.cpp
+    renderer_shader.cpp
     session.cpp
+    
     util.cpp
     game.cpp
     state/object.cpp
@@ -29,6 +31,8 @@ set(GAME_HEADERS
     opengl.hpp
     glclasses.hpp
     renderer.hpp
+    renderer_simple.hpp
+    renderer_shader.hpp
 )
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR})

game/game.cpp

@@ -39,7 +39,7 @@ bool Game::cycle(float dt)
     total += dt;
 
     float spawnInterval = 0.1;
-    while(acc > spawnInterval) {
+    while (acc > spawnInterval) {
         acc -= spawnInterval;
 
         float angle = 2.0 * M_PI * util::randf_0_1();
@@ -57,19 +57,20 @@ bool Game::cycle(float dt)
     }
 #endif
 
-    //std::cout<<"adding dt: " << dt << std::endl;
+    // std::cout<<"adding dt: " << dt << std::endl;
     m_time_for_next_step += dt;
 
     int steps = 0;
-    while(m_time_for_next_step >= m_time_step) {
-        //std::cout<<"time now: " << m_time_for_next_step << std::endl;
+    while (m_time_for_next_step >= m_time_step) {
+        // std::cout<<"time now: " << m_time_for_next_step << std::endl;
         m_time_for_next_step -= m_time_step;
 
         m_state->advance(m_time_step);
         steps++;
     }
 
-    //std::cout << m_time_for_next_step << " s remaining time, " << steps << " steps taken." << std::endl;
+    // std::cout << m_time_for_next_step << " s remaining time, " << steps << "
+    // steps taken." << std::endl;
 
     return true;
 }

game/game.hpp

@@ -3,7 +3,7 @@
 #include "state/state.hpp"
 
 class Game {
-public:
+  public:
     Game();
 
     // main method of the game. run this regulary
@@ -13,7 +13,7 @@ public:
     // for rendering
     game::State *state() const { return m_state; }
 
-private:
+  private:
     game::State *m_state;
 
     float m_time_for_next_step;

game/game_window.hpp

@@ -2,6 +2,8 @@
 
 #include "opengl.hpp"
 #include "renderer.hpp"
+#include "renderer_simple.hpp"
+#include "renderer_shader.hpp"
 
 #include "game.hpp"
 
@@ -14,8 +16,11 @@
 #include "state/explosion.hpp"
 
 class GameWindow : public endofthejedi::GLWindow {
-private:
-protected:
+  private:
+    Game* m_game;
+    endofthejedi::RendererSimple m_renderer;
+
+  protected:
     void init() override {
         glClearColor(0.5f, 0.6f, 0.7f, 1.0f);
         resize();
@@ -24,95 +29,29 @@ protected:
     }
 
     void render(double time) override {
-        //static bool once = false;
-        //if (!once) {
+        // static bool once = false;
+        // if (!once) {
         //    once = true;
         //    for (int i=0; i<1000; i++) {
         //        m_game->cycle(time);
         //    }
         //}
 
-        if (!m_game->cycle(static_cast<float>(time/1000000000.0))) {
-            std::cout<<"stopping the game..." << std::endl;
+        if (!m_game->cycle(static_cast<float>(time / 1000000000.0))) {
+            std::cout << "stopping the game..." << std::endl;
             stop();
         }
 
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-        for (const game::Planet *planet : m_game->state()->planets) {
-            drawPlanet(planet->position, planet->radius);
-        }
-
-        for (const game::Trace *trace : m_game->state()->traces) {
-            drawTrace(trace);
-        }
-
-        for (const game::Explosion *explosion : m_game->state()->explosions) {
-            drawExplosion(explosion);
-        }
-
-        for (const game::Ship *ship : m_game->state()->ships) {
-            drawShip(ship->position);
-        }
-
-        for (const game::Player *player : m_game->state()->players) {
-            for (const game::Missile *missile : player->missiles) {
-                drawMissile(missile->position);
-            }
-        }
+        m_renderer.render(m_game->state());
     }
 
     void resize() override { glViewport(0, 0, getwidth(), getheight()); }
 
-    void drawShip(const glm::vec2 &pos)
-    {
-        //std::cout<<"draw ship @ " << pos.x << ", " << pos.y << std::endl;
-        glm::vec3 color = glm::vec3(0.2, 1.0, 0.3);
-
-        float radius = m_game->state()->shipRadius();
-
-        m_renderer.drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z, 12);
+  public:
+    GameWindow(unsigned int width, unsigned int height, Game *ptr)
+        : endofthejedi::GLWindow(width, height) {
+        m_game = ptr;
     }
-
-    void drawPlanet(const glm::vec2 &pos, float radius)
-    {
-        glm::vec3 color = glm::vec3(0.7, 0.1, 0.2);
-
-        //std::cout<<"draw planet @ " << pos.x << ", " << pos.y << std::endl;
-        m_renderer.drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z, 32);
-    }
-
-    void drawMissile(const glm::vec2 &pos)
-    {
-        glm::vec3 color = glm::vec3(1.0, 1.0, 0.3);
-        m_renderer.drawCircle(pos.x, pos.y, 0.01, color.x, color.y, color.z, 6);
-    }
-
-    void drawTrace(const game::Trace *trace)
-    {
-        for (const game::Trace::TracePoint &p : trace->points) {
-            glm::vec3 color = glm::vec3(0.1, 0.3, 1.0) / (1.0f + 500.0f*p.speed);
-            m_renderer.drawCircle(p.position.x, p.position.y, 0.005, color.x, color.y, color.z, 3);
-        }
-    }
-
-    void drawExplosion(const game::Explosion *explosion)
-    {
-        // TODO: transparent
-        // TODO: with glow in the middle
-        float r = explosion->maxRadius * (explosion->age / explosion->maxAge);
-
-        // TODO: transparency?
-        glm::vec3 color = glm::vec3(1.0, 0.9, 0.1);
-        m_renderer.drawCircle(explosion->position.x, explosion->position.y, r, color.x, color.y, color.z, 64);
-    }
-
-public:
-    GameWindow(unsigned int width, unsigned int height, Game* game)
-        : endofthejedi::GLWindow(width, height) { m_game = game; }
-
-private:
-    Game                   *m_game;
-    endofthejedi::Renderer m_renderer;
 };
-

game/glclasses.cpp

@@ -1,5 +1,8 @@
 #include "glclasses.hpp"
 
+#include <iostream>
+#include <vector>
+
 endofthejedi::VAO::VAO() { glGenVertexArrays(1, &m_name); }
 
 endofthejedi::VAO::~VAO() { glDeleteVertexArrays(1, &m_name); }
@@ -13,27 +16,62 @@ void endofthejedi::VAO::fill(GLuint index, GLint size, GLenum type,
     glVertexAttribPointer(index, size, GL_FLOAT, normalized, stride, pointer);
 }
 
-endofthejedi::Shader::Shader() {
-  m_program = glCreateProgram();
-}
+endofthejedi::Shader::Shader() { m_program = glCreateProgram(); }
 
 endofthejedi::Shader::~Shader() {}
 
-void endofthejedi::Shader::bind() {
-  glUseProgram(m_program);
+bool endofthejedi::Shader::check() {
+    GLint len = 0;
+    GLint result = 0;
+
+    glGetProgramiv(m_program, GL_LINK_STATUS, &result);
+    glGetProgramiv(m_program, GL_INFO_LOG_LENGTH, &len);
+    if (len > 1) {
+        char *error = (char *)malloc(len);
+        glGetProgramInfoLog(m_program, len, NULL, error);
+        std::string str(error);
+        std::cout << str << "\n";
+    }
+    std::cout << "checked program"
+              << "\n";
+
+    return (bool)result;
 }
 
-void endofthejedi::Shader::unbind() {
-  glUseProgram(0);
+bool endofthejedi::Shader::checkShader(GLuint shader) {
+    GLint len = 0;
+    GLint result = 0;
+
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
+    glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &len);
+    if (len > 1) {
+        char *error = (char *)malloc(len+1);
+        glGetShaderInfoLog(shader, 0, &len, error);
+        std::string str(error, error + len);
+        std::cout << str << "\n";
+    }
+    std::cout << "checked shader"
+              << "\n";
+
+    return (bool)result;
 }
 
+void endofthejedi::Shader::bind() { glUseProgram(m_program); }
+
+void endofthejedi::Shader::unbind() { glUseProgram(0); }
+
 void endofthejedi::Shader::load(std::string path, GLenum shadertype) {
     GLuint cheddar = glCreateShader(shadertype);
-  const char* cheddardata = path.c_str();
+    const char *cheddardata = path.c_str();
     glShaderSource(cheddar, 1, &cheddardata, NULL);
     glCompileShader(cheddar);
+    checkShader(cheddar);
     glAttachShader(m_program, cheddar);
     glLinkProgram(m_program);
+    check();
     glDeleteShader(cheddar);
 }
 
+GLuint endofthejedi::Shader::location(std::string name) {
+  return glGetUniformLocation(m_program, name.c_str());
+}

game/glclasses.hpp

@@ -10,15 +10,16 @@ namespace endofthejedi {
 template <GLenum T> class BufferObject {
   private:
     GLuint m_name;
-  GLvoid* m_mappointer;
+    GLvoid *m_mappointer;
+
   protected:
   public:
     BufferObject();
     ~BufferObject();
     void bind();
     void bind(GLuint index, GLintptr offset = 0, GLsizeiptr size = 0);
-  void fill(GLenum usage, GLsizei size = 0, GLvoid* data = NULL);
-  void subfill(GLintptr offset, GLsizei size, const GLvoid* data);
+    void fill(GLenum usage, GLsizei size = 0, GLvoid *data = NULL);
+    void subfill(GLintptr offset, GLsizei size, const GLvoid *data);
     void map(GLenum access);
     void unmap();
 };
@@ -29,17 +30,22 @@ typedef BufferObject<GL_ELEMENT_ARRAY_BUFFER> IBO;
 class VAO {
   private:
     GLuint m_name;
+
   protected:
   public:
     VAO();
     ~VAO();
     void bind();
-  void fill(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride = 0, const GLvoid* pointer = NULL);
+    void fill(GLuint index, GLint size, GLenum type, GLboolean normalized,
+              GLsizei stride = 0, const GLvoid *pointer = NULL);
 };
 
- class Shader {
+class Shader {
   private:
     GLuint m_program;
+    bool check();
+    bool checkShader(GLuint shader);
+
   protected:
   public:
     Shader();
@@ -47,8 +53,8 @@ class VAO {
     void bind();
     void unbind();
     void load(std::string data, GLenum shadertype);
- };
-
+    GLuint location(std::string name);
+};
 }
 
 #define TBufferObject_(pre, post)                                              \

game/opengl.cpp

@@ -3,8 +3,9 @@
 #include <iostream>
 #include <sys/time.h>
 #include <unistd.h>
+#include "options.hpp"
 
-#define UNUSED(foo) (void)foo;
+#define UNUSED(foo) (void) foo;
 
 timespec diff(timespec start, timespec end) {
     timespec result;

game/opengl.hpp

@@ -1,5 +1,4 @@
 #pragma once
-
 #include <stdexcept>
 #include <X11/X.h>
 #include <X11/Xlib.h>

game/raycaster.fs

@@ -0,0 +1,234 @@
+R"raw_string(
+#version 120
+
+struct intersection
+{
+	bool intersected;
+	vec3 point;
+	vec3 normal;
+	vec3 color;
+	float reflection;
+	int idx;
+	//todo different types
+};
+
+varying vec2 outvertex;
+
+//settings
+uniform float aspectratio;
+uniform float time;
+uniform int supersamples;
+uniform int reflections;
+uniform bool shadows;
+uniform vec3 backgroundcolor;
+
+//light
+uniform vec3 l_position;
+uniform float l_radius;
+
+//spheres
+//todo ubo?
+uniform int s_length;
+uniform vec3 s_positions[100];
+uniform float s_radii[100];
+uniform vec4 s_colors[100];
+uniform float s_reflections[100];
+
+const float PI = 3.14159265359;
+
+//din = german industrial normal
+float light_diffuse(vec3 pos, vec3 din)
+{
+	vec3 l_dir = normalize(l_position - pos);
+	return max(dot(l_dir, din), 0.0f);
+}
+
+//adapted from https://wiki.delphigl.com/index.php/shader_ConeVolumeShadow
+float light_shadow(vec3 pos)
+{
+	float s = 1.0f;
+
+	for(int l = 0; l < s_length; l++)
+	{
+		vec3 s_pos = s_positions[l];
+		float s_rad = s_radii[l];
+
+		// project fragment (pos) on the cone axis => F_
+		vec3 nvLO = s_pos - l_position;
+		float dLO = length(nvLO);
+		nvLO /= dLO;
+		vec3 vLF = pos - l_position;
+		float dLF_ = dot(vLF, nvLO);
+		if (dLF_ < dLO) {
+			// fragment before occluder => no shadow
+			continue;
+		}
+		vec3 F_ = l_position + dLF_ * nvLO;
+		float rF = distance(F_, pos);
+
+		// compute outer and inner radius at F_
+		float rF_outer = (s_rad + l_radius) * (dLF_ / dLO) - l_radius;
+		if (rF >= rF_outer) {
+			// outside the outer cone => no shadow
+			continue;
+		}
+		float rF_inner = (s_rad - l_radius) * (dLF_ / dLO) + l_radius;
+		if (rF_inner >= rF) {
+			// inside the inner cone => full shadow
+			return 0.0;
+		}
+		else if (rF_inner >= 0.0 || rF >= -rF_inner) {
+			// soft shadow, linear interpolation
+			s *= (rF - rF_inner) / (rF_outer - rF_inner);
+		}
+		else {
+			// light from both sides of the occluder
+			s *= (-2.0*rF_inner) / (rF_outer - rF_inner);
+		}
+
+	}
+
+	return s;
+}
+
+intersection intersect_sphere(vec3 r_pos, vec3 r_dir, vec3 s_pos, float s_rad, inout float minimum)
+{
+	intersection result = intersection(false,vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+
+	vec3 v = r_pos - s_pos;
+	float a = dot(r_pos, r_pos);
+	float b = dot(v, r_dir);
+	float c = dot(v, v) - (s_rad * s_rad);
+	float d = b * b - c;
+
+	if(d >= 0)
+	{
+		float w1 = -b - sqrt(d);
+		float w2 = -b + sqrt(d);
+
+		if(w1 > 0.0f || w2 > 0.0f)
+		{
+			float w = min(w1, w2);
+			float o = max(w1, w2);
+
+			if(w1 <= 0.0f)
+				w = w2;
+			else
+			if(w2 <= 0.0f)
+				w = w1;
+
+			if(w < minimum)
+			{
+				minimum = w;
+			}
+			else
+			{
+				return intersection(false,vec3(0.0f, 0.0f, 0.0f),
+							  vec3(0.0f, 0.0f, 0.0f),
+							  vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+			}
+
+			vec3 p = r_pos + (w * r_dir);
+			result.intersected = true;
+			result.point = p;
+			result.normal = normalize((p - s_pos) / s_rad);
+			return result;
+		}
+	}
+
+	return result;
+}
+
+intersection intersect(vec3 r_pos, vec3 r_dir, int idx)
+{
+	intersection result = intersection(false,vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+	float minimum = 1000.0f;
+
+	for(int l = 0; l < s_length; l++)
+	{
+		if(idx == l)
+			continue;
+
+		float maximum;
+
+		intersection r = intersect_sphere(r_pos, r_dir, s_positions[l], s_radii[l], minimum);
+		if(r.intersected)
+		{
+			r.color = s_colors[l].rgb;
+			r.idx = l;
+			r.reflection = s_reflections[l];
+
+			result = r;
+		}
+		//todo other geometric objects
+		//todo handle min with other geometric objects
+	}
+
+	return result;
+}
+
+vec3 cast_ray(vec3 r_pos, vec3 r_pixel)
+{
+	vec3 r_dir = normalize(r_pixel - r_pos);
+
+	vec3 color = backgroundcolor;
+
+	intersection i = intersection(false,vec3(0.0f, 0.0f, 0.0f),
+					    vec3(0.0f, 0.0f, 0.0f),
+					    vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+
+	vec3 p = r_pos;
+	vec3 d = r_dir;
+	int idx = -1;
+
+	for(int bounce = 0; bounce < reflections; bounce++)
+	{
+		intersection i = intersect(p,d, idx);
+
+		if(i.intersected)
+		{
+			float l_factor = light_diffuse(i.point, i.normal);
+
+			if(shadows && l_factor > 0.004f)
+			{
+				l_factor *= light_shadow(i.point);
+			}
+
+			if(bounce == 0)
+			{
+				color = i.color * l_factor;
+			}
+			else
+			{
+				color = mix(color, color * i.color * l_factor, i.reflection);
+			}
+
+			//d = 2*(dot(p, i.normal))*i.normal - p;
+			d = reflect(-p, i.normal);
+			p = i.point;
+			idx = i.idx;
+		}
+		else
+			break;
+	}
+
+	return color;
+}
+
+void main() 
+{
+	vec2 rp = outvertex;
+	rp.x = rp.x * aspectratio;
+	vec4 outcolor = vec4(cast_ray(vec3(0.0f, 0.0f, 1.0f), vec3(rp, 0.0f)), 0.0f);
+	for(int supersample = 1; supersample < supersamples; supersample++)
+	{
+		outcolor = mix(outcolor, vec4(cast_ray(vec3(sin(supersample * PI/supersamples)/200, cos(supersample * PI/supersamples)/200, 1.0f), vec3(rp, 0.0f)), 0.0f), 0.5f);
+	}
+  gl_FragColor = outcolor;
+}
+
+)raw_string"

game/raycaster.vs

@@ -0,0 +1,13 @@
+R"raw_string(
+#version 120
+
+attribute vec2 invertex;
+varying vec2 outvertex;
+
+void main() {
+     gl_Position.xy = invertex;
+     gl_Position.zw = vec2(0.0f, 1.0);
+     outvertex = invertex;
+}
+
+)raw_string"

game/renderer.cpp

@@ -1,18 +1,4 @@
 #include "renderer.hpp"
 
-endofthejedi::Renderer::Renderer() {
-
-}
-
-endofthejedi::Renderer::~Renderer() {}
-
-void endofthejedi::Renderer::drawCircle(float x, float y, float radius, float r, float g, float b, int numSides)
-{
-    glBegin(GL_TRIANGLE_FAN);
-    glColor3f(r,g,b);
-    glVertex2f(x, y); // center of circle
-    for (int i = 0; i <= numSides; i++) {
-        glVertex2f(x + (radius * cos(i * 2 * M_PI / numSides)), y + (radius * sin(i * 2 * M_PI / numSides)));
-    }
-    glEnd();
+void endofthejedi::Renderer::render(const game::State *state) {
 }

game/renderer.hpp

@@ -5,21 +5,15 @@
 #include <epoxy/gl.h>
 #include <epoxy/glx.h>
 
-#include "glclasses.hpp"
+#include "game.hpp"
 
 namespace endofthejedi {
 
 class Renderer {
   private:
-  VBO m_vbo;
-  VAO m_vao;
-  Shader m_shader;
   protected:
   public:
-  Renderer();
-  ~Renderer();
-  void drawCircle(float x, float y, float radius, float r,
-                  float g, float b, int numSides=12);
+    virtual void render(const game::State *state);
 };
 
 }

game/renderer_shader.cpp

@@ -0,0 +1,75 @@
+#include "renderer_shader.hpp"
+
+#include <vector>
+#include "glm/glm.hpp"
+#include "glm/vec2.hpp"
+#include "glm/vec3.hpp"
+#include "glm/gtc/type_ptr.hpp"
+
+endofthejedi::RendererShader::RendererShader() {
+    m_shader.load(vss, GL_VERTEX_SHADER);
+    m_shader.load(fss, GL_FRAGMENT_SHADER);
+}
+
+void endofthejedi::RendererShader::render(const game::State *state) {
+    m_shader.bind();
+
+    std::vector<glm::vec3> positions;
+    std::vector<glm::vec4> colors;
+    std::vector<GLfloat> radii;
+    std::vector<GLfloat> reflections;
+
+    for (const game::Planet *planet : state->planets) {
+        positions.push_back(glm::vec3(planet->position, -5.0f));
+        radii.push_back(planet->radius);
+        colors.push_back(glm::vec4(1.0f, 0.0f, 0.0f, 0.5f));
+    }
+
+    for (const game::Ship *ship : state->ships) {
+        positions.push_back(glm::vec3(ship->position, -3.0f));
+        radii.push_back(ship->radius);
+        colors.push_back(glm::vec4(1.0f, 0.0f, 0.0f, 0.5f));
+    }
+
+    for (const game::Player *player : state->players) {
+        for (const game::Missile *missile : player->missiles) {
+            positions.push_back(glm::vec3(missile->position, -3.0f));
+            radii.push_back(0.01f);
+            colors.push_back(glm::vec4(1.0f, 0.0f, 0.0f, 0.5f));
+        }
+    }
+
+    for (auto &pos : positions) {
+        pos.x *= 5;
+        pos.y *= 5;
+    }
+    for (auto &rad : radii) {
+        rad *= 5;
+    }
+
+    /*
+    for (const game::Trace *trace : state->traces) {
+      positions.push_back(glm::vec3(trace->position, -3.0f));
+      radii.push_back(trace->radius);
+      colors.push_back(glm::vec4(0.0f, 1.0f, 0.0f, 0.5f));
+      }*/
+
+    glUniform1f(m_shader.location("aspectratio"), 1.0f);
+    glUniform1i(m_shader.location("reflections"), 1);
+    glUniform3f(m_shader.location("l_position"), 0.6f, 0.1f, 0.0f);
+    glUniform1f(m_shader.location("l_radius"), 1.0f);
+    glUniform3fv(m_shader.location("s_positions"), positions.size(),
+                 glm::value_ptr(positions[0]));
+    glUniform4fv(m_shader.location("s_colors"), colors.size(),
+                 glm::value_ptr(colors[0]));
+    glUniform1fv(m_shader.location("s_radii"), radii.size(), &radii[0]);
+    glUniform1i(m_shader.location("s_length"), positions.size());
+
+    // render fullscreen quad with legacy opengl (too lazy, sorry)
+    glBegin(GL_QUADS);
+    glVertex2f(-1.0f, -1.0f);
+    glVertex2f(1.0f, -1.0f);
+    glVertex2f(1.0f, 1.0f);
+    glVertex2f(-1.0f, 1.0f);
+    glEnd();
+}

game/renderer_shader.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+static const char *vss =
+#include "raycaster.vs"
+  ;
+static const char *fss =
+#include "raycaster.fs"
+  ;
+
+#include "renderer.hpp"
+
+#include "glclasses.hpp"
+#include "game.hpp"
+#include "state/planet.hpp"
+#include "state/trace.hpp"
+#include "state/player.hpp"
+#include "state/ship.hpp"
+
+namespace endofthejedi {
+
+  class RendererShader : Renderer {
+  private:
+    Shader m_shader;
+  protected:
+  public:
+    RendererShader();
+    void render(const game::State *state) override;
+  };
+
+}

game/renderer_simple.cpp

@@ -0,0 +1,79 @@
+#include "renderer_simple.hpp"
+
+void endofthejedi::RendererSimple::drawCircle(float x, float y, float radius,
+                                              float r, float g, float b,
+                                              int numSides) {
+    glBegin(GL_TRIANGLE_FAN);
+    glColor3f(r, g, b);
+    glVertex2f(x, y); // center of circle
+    for (int i = 0; i <= numSides; i++) {
+        glVertex2f(x + (radius * cos(i * 2 * M_PI / numSides)),
+                   y + (radius * sin(i * 2 * M_PI / numSides)));
+    }
+    glEnd();
+}
+
+void endofthejedi::RendererSimple::drawShip(const glm::vec2 &pos,
+                                            float radius) {
+    // std::cout<<"draw ship @ " << pos.x << ", " << pos.y << std::endl;
+    glm::vec3 color = glm::vec3(0.2, 1.0, 0.3);
+
+    drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z, 12);
+}
+
+void endofthejedi::RendererSimple::drawPlanet(const glm::vec2 &pos,
+                                              float radius) {
+    glm::vec3 color = glm::vec3(0.7, 0.1, 0.2);
+
+    // std::cout<<"draw planet @ " << pos.x << ", " << pos.y << std::endl;
+    drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z, 32);
+}
+
+void endofthejedi::RendererSimple::drawMissile(const glm::vec2 &pos) {
+    glm::vec3 color = glm::vec3(1.0, 1.0, 0.3);
+    drawCircle(pos.x, pos.y, 0.01, color.x, color.y, color.z, 6);
+}
+
+void endofthejedi::RendererSimple::drawTrace(const game::Trace *trace) {
+    for (const game::Trace::TracePoint &p : trace->points) {
+        glm::vec3 color = glm::vec3(0.1, 0.3, 1.0) / (1.0f + 500.0f * p.speed);
+        drawCircle(p.position.x, p.position.y, 0.005, color.x, color.y, color.z,
+                   3);
+    }
+}
+
+void endofthejedi::RendererSimple::drawExplosion(
+    const game::Explosion *explosion) {
+    // TODO: transparent
+    // TODO: with glow in the middle
+    float r = explosion->maxRadius * (explosion->age / explosion->maxAge);
+
+    // TODO: transparency?
+    glm::vec3 color = glm::vec3(1.0, 0.9, 0.1);
+    drawCircle(explosion->position.x, explosion->position.y, r, color.x,
+               color.y, color.z, 64);
+}
+
+void endofthejedi::RendererSimple::render(const game::State *state) {
+    for (const game::Planet *planet : state->planets) {
+        drawPlanet(planet->position, planet->radius);
+    }
+
+    for (const game::Trace *trace : state->traces) {
+        drawTrace(trace);
+    }
+
+    for (const game::Explosion *explosion : state->explosions) {
+        drawExplosion(explosion);
+    }
+
+    for (const game::Ship *ship : state->ships) {
+        drawShip(ship->position, ship->radius);
+    }
+
+    for (const game::Player *player : state->players) {
+        for (const game::Missile *missile : player->missiles) {
+            drawMissile(missile->position);
+        }
+    }
+}

game/renderer_simple.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "renderer.hpp"
+
+#include "glclasses.hpp"
+
+#include "game.hpp"
+#include "state/trace.hpp"
+#include "state/object.hpp"
+#include "state/missile.hpp"
+#include "state/player.hpp"
+#include "state/planet.hpp"
+#include "state/ship.hpp"
+#include "state/explosion.hpp"
+
+namespace endofthejedi {
+
+class RendererSimple : Renderer {
+  private:
+    void drawCircle(float x, float y, float radius, float r, float g, float b,
+                    int numSides = 12);
+  void drawShip(const glm::vec2 &pos, float radius);
+    void drawPlanet(const glm::vec2 &pos, float radius);
+    void drawMissile(const glm::vec2 &pos);
+    void drawTrace(const game::Trace *trace);
+    void drawExplosion(const game::Explosion *explosion);
+
+  protected:
+  public:
+    void render(const game::State *state) override;
+};
+
+}

game/session.hpp

@@ -1,5 +1,7 @@
 #pragma once
 
+#define ASIO_STANDALONE
+
 #include <iostream>
 #include <memory>
 #include <utility>

game/triangle_window.hpp

@@ -1,36 +0,0 @@
-#pragma once
-
-#include "opengl.hpp"
-
-class TriangleWindow : public endofthejedi::GLWindow {
-private:
-protected:
-    void init() override {
-        glClearColor(0.5f, 0.6f, 0.7f, 1.0f);
-        resize();
-
-        glEnable(GL_DEPTH_TEST);
-    }
-    void render(double time) override {
-        (void) time;
-
-        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
-        glBegin(GL_TRIANGLES);
-        glColor3f(1.0f, 0.0f, 0.0f);
-        glVertex3f(0.0f, -1.0f, 0.0f);
-        glColor3f(0.0f, 1.0f, 0.0f);
-        glVertex3f(-1.0f, 1.0f, 0.0f);
-        glColor3f(0.0f, 0.0f, 1.0f);
-        glVertex3f(1.0f, 1.0f, 0.0f);
-        glEnd();
-    }
-    void resize() override { glViewport(0, 0, getwidth(), getheight()); }
-
-public:
-    TriangleWindow(unsigned int width, unsigned int height)
-        : endofthejedi::GLWindow(width, height)
-    {
-    }
-};
-