int main()
{
GLFWwindow* window;
if (!glfwInit())
{
printf("Error initializing GLFW\n");
return -1;
}
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, GL_VERSION_MAJOR);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, GL_VERSION_MINOR);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
//glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
glfwWindowHint(GLFW_SAMPLES, 8);
window = glfwCreateWindow(1920, 1080, "Test Window", glfwGetPrimaryMonitor(), NULL);
if (!window)
{
printf("Error creating GLFW window\n");
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetKeyCallback(window, key_callback);
glfwSetMouseButtonCallback(window, mouse_button_callback);
glfwSetCursorPosCallback(window, cursor_position_callback);
glfwSetScrollCallback(window, scroll_callback);
if (gl3wInit())
{
printf("Error initializing OpenGL\n");
glfwTerminate();
return -1;
}
printf("OpenGL %s GLSL %s\n", glGetString(GL_VERSION), glGetString(GL_SHADING_LANGUAGE_VERSION));
if (!gl3wIsSupported(GL_VERSION_MAJOR, GL_VERSION_MINOR))
{
printf("OpenGL %i.%i is not supported\n", GL_VERSION_MAJOR, GL_VERSION_MINOR);
glfwTerminate();
return -1;
}
glViewport(0, 0, 1920, 1080);
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
GLuint programID = loadShadersvf("shaders/simple.vsh", "shaders/simple.fsh");
GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
//glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_buffer_data), vertex_buffer_data, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, sizeof(sphere_model), sphere_model, GL_STATIC_DRAW);
GLuint ibo;
glGenBuffers(1, &ibo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sphere_indices), sphere_indices, GL_STATIC_DRAW);
//glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(index_buffer_data), index_buffer_data, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
glDisableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
double timesteps[] = {1, 60, 60 * 60, 60 * 60 * 24, 60 * 60 * 24 * 7, 60 * 60 * 24 * 30, 60 * 60 * 24 * 365};
int timestepCounter = 0;
World world;
world.num_functions = 0;
//Add the functions for gravitational attraction to the world's object list, and have it execute when updateWorld() is called
addFunction(&world, attract, COMPONENT_POSITION | COMPONENT_VELOCITY);
addFunction(&world, move, COMPONENT_POSITION | COMPONENT_VELOCITY);
unsigned int bodies[11];
//Create all the planets with the correct masses, sizes, and velocities
bodies[0] = createStar(&world, "Sun", 0, 0, 0, 0, 0, 0, 1.989 * pow(10, 30), 6.963 * pow(10,8), 1);
bodies[1] = createPlanet(&world, "Mercury", -0.35790 * AU, -0.04240 * AU, -0.11618 * AU,
-0.00000004 * AU, 0.00000003 * AU, 0.00000031 * AU, 3.285 * pow(10,23), 2.44 * pow(10,6), 0.4549, 0.4509, 0.4705);
bodies[2] = createPlanet(&world, "Venus", -0.46075 * AU, -0.03422 * AU, -0.56289 * AU,
-0.00000017 * AU, -0.00000001 * AU, 0.00000014 * AU, 4.867 * pow(10, 24), 6.052 * pow(10,6), 0.4627, 0.568, 0.380);
bodies[3] = createPlanet(&world, "Earth", 0.99542 * AU, 0, 0.01938 * AU,
0.00000001 * AU, 0, -0.00000019 * AU, 5.972 * pow(10, 24), 6.371 * pow(10,6), 0, 0.4, 0.6);
bodies[4] = createPlanet(&world, "Moon", 0.99708 * AU, -0.00016 * AU, 0.02141 * AU,
0.00000001 * AU + 722.66, 0, -0.00000019 * AU - 722.66, 7.348 * pow(10, 22), 1.737 * pow(10,6), 0.4, 0.4, 0.4);
bodies[5] = createPlanet(&world, "Mars", 1.38763 * AU, 0.01755 * AU, -0.79510 * AU,
-0.00000009 * AU, -0.00000001 * AU, -0.00000013 * AU, 6.39 * pow(10, 23), 3.39 * pow(10,6), 0.8157, 0.5294, 0.3922);
bodies[6] = createPlanet(&world, "Jupiter", 5.32462 * AU, 0.11488 * AU, 1.04223 * AU,
0.00000002 * AU, 0, -0.00000008 * AU, 1.898 * pow(10,27), 69.911 * pow(10,6), 0.8824, 0.7961, 0.7412);
bodies[7] = createPlanet(&world, "Saturn", 3.30063 * AU, 0.29595 * AU, -9.47771 * AU,
-0.00000006 * AU, 0, -0.00000002 * AU, 5.683 * pow(10,26), 58.232 * pow(10,6), 0.7843, 0.6392, 0.4314);
bodies[8] = createPlanet(&world, "Uranus", -18.76415 * AU, -0.21783 * AU, 6.83528 * AU,
0.00000002 * AU, 0, 0.00000004 * AU, 8.681 * pow(10,25), 25.362 * pow(10,6), 0.8314, 0.9804, 0.9922);
bodies[9] = createPlanet(&world, "Neptune", -28.07048 * AU, -0.42924 * AU, -10.42730 * AU,
-0.00000002 * AU, 0, 0.0000003 * AU, 1.024 * pow(10,26), 24.622 * pow(10,6), 0.2, 0.2902, 0.7451);
bodies[10] = createPlanet(&world, "Pluto", -8.88081 * AU, 0.86973 * AU, -31.76914 * AU,
-0.00000003 * AU, -0.00000001 * AU, 0.0000001 / 41.0 * AU, 1.309 * pow(10,22), 1.186 * pow(10, 6), 0.7137, 0.6824, 0.6314);
double mat4d_projection[4][4] = MATRIX_IDENTITY_4;
mat4dProjection(M_PI / 2.0, 16.0/9.0, pow(10,6), pow(10,13), mat4d_projection);
unsigned int parent = 3;
Camera camera;
makeCamera(&camera, 0, 0, pow(10, 9), &world, bodies[parent]);
double mat4d_camera[4][4] = MATRIX_IDENTITY_4;
float mat4_camera[4][4];
double sensitivity = 0.005;
printf("Starting main loop\n");
while (!glfwWindowShouldClose(window))
{
clearInput();
glfwPollEvents();
//rotate or zoom out the camera depending on camera movement and scrolling
double dx, dy, dz;
getMouseDelta(&dx, &dy, &dz);
updateCamera(&camera, dx * sensitivity, dy * sensitivity, dz);
if (getClicked())
{
if(++parent > 10) parent = 0;
changeCameraParent(&camera, pow(10, 9), &world, bodies[parent]);
}
timestepCounter += getTimeStepChange();
if (timestepCounter > 6) timestepCounter = 0;
else if (timestepCounter < 0) timestepCounter = 6;
setTimeStep(timesteps[timestepCounter]);
//get the time since the last frame to do proper delta-timing for the gravitational attraction and movement
double delta = timeTick();
updateWorld(&world, delta);
getCameraMatrix(&camera, mat4d_camera);
double modelView[4][4];
mat4dMlt(mat4d_projection, mat4d_camera, modelView);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(programID);
glBindVertexArray(vao);
glEnableVertexAttribArray(0);
//For each of the objects in the world, loop through them and render them if they have a position and radius,
//rendering works by rendering the same sphere over and over, with a different translation and scale
//because all objects in this program are spheres
for (int i = 0; i < WORLD_MAX_ENTITIES; ++i)
{
if (isEntity(&world, i, COMPONENT_POSITION | COMPONENT_RADIUS))
{
/*double pos[4] = {world.position[i].position[0], world.position[i].position[1], world.position[i].position[2], 1};
vec4dMltMat(mat4d_camera, pos, pos);
double distance = vec3dLength(pos);
printf("%i: %f\n", i, distance);
double mat4d_model[4][4] = MATRIX_IDENTITY_4;
double radius = world.radius[i].radius;
double scaleFactor = distance * (1 / pow(radius,2));
printf("Scale factor: %f\n", scaleFactor);
if (scaleFactor > pow(10,-3))
{
printf("Has been scaled\n");
radius = radius / scaleFactor;
}
printf("Radius: %f\n", radius);*/
double mat4d_model[4][4] = MATRIX_IDENTITY_4;
double radius = world.radius[i].radius;
double scale[3] = {radius, radius, radius};
mat4dGenScale(scale, mat4d_model);
mat4dTranslate(world.position[i].position, mat4d_model);
double modelViewProjection[4][4];
mat4dMlt(modelView, mat4d_model, modelViewProjection);
float modelViewProjectionf[4][4];
doubleToSingle(modelViewProjection[0], modelViewProjectionf[0], 16);
double color[3] = {1,1,1};
if (isEntity(&world, i, COMPONENT_COLOR))
{
vec3dSetEqual(world.color[i].color, color);
}
float colorf[3];
doubleToSingle(color, colorf, 3);
GLint colorLoc = glGetUniformLocation(programID, "in_color");
glUniform3fv(colorLoc, 1, colorf);
GLint mvpLoc = glGetUniformLocation(programID, "mvp");
glUniformMatrix4fv(mvpLoc, 1, GL_FALSE, modelViewProjectionf[0]);
glDrawElements(GL_TRIANGLES, sphere_num_indices, GL_UNSIGNED_INT, 0);
}
}
glDisableVertexAttribArray(0);
glBindVertexArray(0);
glfwSwapBuffers(window);
}
glfwDestroyWindow(window);
glfwTerminate();
return 0;
}
static bool drawStars(SkCanvas* canvas, int step)
{
SkPath path, out;
const int stars = 25;
int pts[stars];
static bool initialize = true;
int s;
for (s = 0; s < stars; ++s) {
pts[s] = 4 + (s % 7);
}
SkPoint locs[stars];
SkScalar angles[stars];
SkScalar innerRadius[stars];
SkScalar outerRadius[stars];
const int width = 640;
const int height = 480;
const int margin = 30;
const int minRadius = 120;
const int maxInner = 800;
const int maxOuter = 1153;
for (s = 0; s < stars; ++s) {
int starW = width - margin * 2 + (SkScalar) s * (stars - s) / stars;
locs[s].fX = (int) (step * (1.3f * (s + 1) / stars) + s * 121) % (starW * 2);
if (locs[s].fX > starW) {
locs[s].fX = starW * 2 - locs[s].fX;
}
locs[s].fX += margin;
int starH = height - margin * 2 + (SkScalar) s * s / stars;
locs[s].fY = (int) (step * (1.7f * (s + 1) / stars) + s * 183) % (starH * 2);
if (locs[s].fY > starH) {
locs[s].fY = starH * 2 - locs[s].fY;
}
locs[s].fY += margin;
angles[s] = ((step + s * 47) % (360 * 4)) * 3.1415f / 180 / 4;
innerRadius[s] = (step + s * 30) % (maxInner * 2);
if (innerRadius[s] > maxInner) {
innerRadius[s] = (maxInner * 2) - innerRadius[s];
}
innerRadius[s] = innerRadius[s] / 4 + minRadius;
outerRadius[s] = (step + s * 70) % (maxOuter * 2);
if (outerRadius[s] > maxOuter) {
outerRadius[s] = (maxOuter * 2) - outerRadius[s];
}
outerRadius[s] = outerRadius[s] / 4 + minRadius;
createStar(path, innerRadius[s] / 4.0f, outerRadius[s] / 4.0f,
angles[s], pts[s], locs[s]);
}
#define SHOW_PATH 0
#if SHOW_PATH
showPath(path, "original:");
#endif
#define TEST_SIMPLIFY 01
#if TEST_SIMPLIFY
simplify(path, true, out);
#if SHOW_PATH
showPath(out, "simplified:");
#endif
#endif
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(6);
paint.setColor(0x1F003f7f);
canvas->drawPath(path, paint);
paint.setColor(0xFF305F00);
paint.setStrokeWidth(1);
#if TEST_SIMPLIFY
canvas->drawPath(out, paint);
#endif
return true;
}
