* KREBOLAIDS

README.md

@@ -1,4 +1,9 @@
 Klassische Kepler Kriege
-===
+========================
 
 Game based on NewtonWars (https://github.com/Draradech/NewtonWars), rewritten in C++ with some more fancy OpenGL shitz.
+
+dependencies
+------------
+
+libepoxy-dev

game/CMakeLists.txt

@@ -10,7 +10,6 @@ set(GAME_SRC
     glclasses.cpp
     renderer.cpp
     game_window.cpp
-    triangle_window.cpp
 
     util.cpp
     game.cpp

game/game.cpp

@@ -6,8 +6,7 @@
 
 #include <cmath>
 
-Game::Game()
+Game::Game() {
-{
     // advance simulation with 100 Hz
     m_time_step = 1.0 / 100.0;
     m_time_for_next_step = 0.0;
@@ -22,8 +21,7 @@ Game::Game()
     // m_state->addPlayer(2);
 }
 
-bool Game::cycle(float dt)
+bool Game::cycle(float dt) {
-{
     static float acc = 0.0;
     acc += dt;
 
@@ -54,7 +52,8 @@ bool Game::cycle(float dt)
         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;
 #else

game/game_window.hpp

@@ -54,28 +54,28 @@ protected:
 
     void resize() override { glViewport(0, 0, getwidth(), getheight()); }
 
-    void drawShip(const glm::vec2 &pos)
+    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);
+        m_renderer.drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z,
+                              12);
     }
 
-    void drawPlanet(const glm::vec2 &pos, float radius)
+    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);
+        m_renderer.drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z,
+                              32);
     }
 
-    void drawMissile(const glm::vec2 &pos)
+    void drawMissile(const glm::vec2 &pos) {
-    {
         glm::vec3 color = glm::vec3(1.0, 1.0, 0.3);
-        m_renderer.drawCircle(pos.x, pos.y, 0.005, color.x, color.y, color.z, 5);
+        m_renderer.drawCircle(pos.x, pos.y, 0.005, color.x, color.y, color.z,
+                              5);
     }
 
   public:
@@ -86,4 +86,3 @@ 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); }
@@ -13,20 +16,33 @@ void endofthejedi::VAO::fill(GLuint index, GLint size, GLenum type,
     glVertexAttribPointer(index, size, GL_FLOAT, normalized, stride, pointer);
 }
 
-endofthejedi::Shader::Shader() {
+endofthejedi::Shader::Shader() { m_program = glCreateProgram(); }
-  m_program = glCreateProgram();
-}
 
 endofthejedi::Shader::~Shader() {}
 
-void endofthejedi::Shader::bind() {
+bool endofthejedi::Shader::check() {
-  glUseProgram(m_program);
+    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";
+
     }
 
-void endofthejedi::Shader::unbind() {
+    return (bool)result;
-  glUseProgram(0);
 }
 
+bool endofthejedi::Shader::checkShader() { return false; }
+
+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();
@@ -35,5 +51,5 @@ void endofthejedi::Shader::load(std::string path, GLenum shadertype) {
     glAttachShader(m_program, cheddar);
     glLinkProgram(m_program);
     glDeleteShader(cheddar);
+    check();
 }
-

game/glclasses.hpp

@@ -11,6 +11,7 @@ template <GLenum T> class BufferObject {
   private:
     GLuint m_name;
     GLvoid *m_mappointer;
+
   protected:
   public:
     BufferObject();
@@ -29,17 +30,21 @@ 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 {
   private:
     GLuint m_program;
+  bool check();
+  bool checkShader();
   protected:
   public:
     Shader();
@@ -48,7 +53,6 @@ class VAO {
     void unbind();
     void load(std::string data, GLenum shadertype);
 };
-
 }
 
 #define TBufferObject_(pre, post)                                              \

game/main.cpp

@@ -1,10 +1,60 @@
 #include "opengl.hpp"
 
 #include <iostream>
+#include <getopt.h>
 
 #include "game_window.hpp"
+#include "options.hpp"
+
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+
+    char c;
+
+    static struct option long_options[] =
+        {
+          /* These options set a flag. */
+//        {"verbose", no_argument,       &verbose_flag, 1},
+//        {"brief",   no_argument,       &verbose_flag, 0},
+          /* These options don’t set a flag.
+             We distinguish them by their indices. */
+//        {"add",     no_argument,       0, 'a'},
+//        {"append",  no_argument,       0, 'b'},
+//        {"delete",  required_argument, 0, 'd'},
+//        {"create",  required_argument, 0, 'c'},
+          {"fps",     no_argument,       0, 'f'},
+          {0, 0, 0, 0}
+        };
+
+    int option_index = 0;
+
+    while(1){
+        c = getopt_long (argc, argv, "abc:d:f",
+                       long_options, &option_index);
+        if (c == -1)
+            break;
+
+        switch (c)
+        {
+            case 'f':
+                SET_FLAG(SHOW_FPS,true);
+                break;
+                /*case 'c':
+                    cvalue = optarg;
+                    break;
+                */
+
+            case '?':
+                /* getopt_long already printed an error message. */
+                break;
+
+            default:
+                abort();
+        }
+    }
 
-int main(int argc, const char *argv[]) {
     GameWindow window(500, 500);
     window.set_maxfps(60.0);
     window.loop();

game/main.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/main.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/opengl.cpp

@@ -3,6 +3,7 @@
 #include <iostream>
 #include <sys/time.h>
 #include <unistd.h>
+#include "options.hpp"
 
 #define UNUSED(foo) (void) foo;
 
@@ -130,10 +131,12 @@ void endofthejedi::GLWindow::loop() {
         prev = current;
         if (delta > 0.0) {
             m_fps = (1000000000.0 / delta);
+            if (ISSET_FLAG(SHOW_FPS)) {
                 std::cout << m_fps << "\n";
             }
         }
     }
+}
 
 void endofthejedi::GLWindow::stop() { m_running = false; }
 

game/options.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#define TEST_FLAG1 0
+#define SHOW_FPS 1
+#define TEST_FLAG2 2
+//...
+
+
+
+
+#define SET_FLAG(x,y) optionsFlags&=(~((1)<<x));optionsFlags|=((y&1)<<x)
+#define ISSET_FLAG(x) (optionsFlags&((1)<<x))
+uint64_t optionsFlags;
+
+/*
+ * usage:
+ * SET_FLAG(SHOW_FPS,true);
+ *
+ * if(ISSET_FLAG(SHOW_FPS)){
+ * ...
+ * }
+ */

game/renderer.cpp

@@ -1,18 +1,32 @@
 #include "renderer.hpp"
 
-endofthejedi::Renderer::Renderer() {
+static const char *vss =
+#include "main.vs"
+    ;
+static const char *fss =
+#include "main.fs"
+    ;
 
+endofthejedi::Renderer::Renderer() {
+    m_shader.load(vss, GL_VERTEX_SHADER);
+    m_shader.load(fss, GL_FRAGMENT_SHADER);
 }
 
 endofthejedi::Renderer::~Renderer() {}
 
+void endofthejedi::Renderer::render() {
+    m_shader.bind();
+
+}
+
 void endofthejedi::Renderer::drawCircle(float x, float y, float radius, float r,
                                         float g, float b, int numSides) {
     glBegin(GL_TRIANGLE_FAN);
     glVertex2f(x, y); // center of circle
     for (int i = 0; i <= numSides; i++) {
         glColor3f(r, g, b);
-    glVertex2f(x + (radius * cos(i * 2 * M_PI / numSides)), y + (radius * sin(i * 2 * M_PI / numSides)));
+        glVertex2f(x + (radius * cos(i * 2 * M_PI / numSides)),
+                   y + (radius * sin(i * 2 * M_PI / numSides)));
     }
     glEnd();
 }

game/renderer.hpp

@@ -14,12 +14,13 @@ class Renderer {
     VBO m_vbo;
     VAO m_vao;
     Shader m_shader;
+
   protected:
   public:
     Renderer();
     ~Renderer();
-  void drawCircle(float x, float y, float radius, float r,
+    void render();
-                  float g, float b, int numSides=12);
+    void drawCircle(float x, float y, float radius, float r, float g, float b,
+                    int numSides = 12);
 };
-
 }

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)
-    {
-    }
-};
-