--- /dev/null
+/**
+ * @file graphics.c
+ * @author Sam Moore (20503628) 2012
+ * - Adapted from template program provided by UWA
+ * @purpose Definition of graphics related functions
+ * NOTE: This file is identical for both the single-threaded and multi-threaded versions of the program
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h> // Needed for clock
+#include <math.h> // Maths functions (sin, cos)
+
+#include "graphics.h" //Function declarations
+#include "nbody.h" //The simulation
+
+
+// --- Variable definitions --- //
+double previousTime, eyeTheta, eyePhi, eyeRho;
+float look[3];
+int windowWidth, windowHeight, upY;
+double scale = 1.0;
+
+#ifdef FLYING_CAMERA
+Camera eye;
+#endif //FLYING_CAMERA
+
+/**
+ * @function Graphics_Run
+ * @purpose Setup and start the graphics engine
+ * @param argc - Number of arguments to main function, passed to glutInit
+ * @param argv - Argument strings for main function, passed to glutInit
+ */
+void Graphics_Run(int argc, char ** argv)
+{
+ if (options.draw_graphics == false)
+ {
+ // This message is left here for when I inevitably accidentally call the function
+ fprintf(stderr, "Graphics_Run should not be called if graphics are disabled!\n");
+ exit(EXIT_FAILURE);
+ }
+
+ glutInit(&argc, argv);
+ glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+ glutInitWindowSize(WIDTH, HEIGHT);
+ glutInitWindowPosition(POSITION_X, POSITION_Y);
+
+ //Set window title based on version of program
+ #ifdef SINGLE_THREADED
+ glutCreateWindow("N-Body : Single-Threaded");
+ #elif defined PTHREADED
+ glutCreateWindow("N-Body : Multi-Threaded (pthread)");
+ #elif defined OMP_THREADED
+ glutCreateWindow("N-Body : Multi-Threaded (OpenMP)");
+ #else
+ glutCreateWindow("N-Body");
+ #endif
+ glutDisplayFunc(Graphics_Display);
+ glutIdleFunc(Graphics_Display);
+ glutKeyboardFunc(Graphics_Keyboard);
+ glutReshapeFunc(Graphics_Reshape);
+
+
+ glClearColor(1.0,1.0,1.0,0.0);
+ glColor3f(0.0f, 0.0f, 0.0f);
+ glPointSize(POINT_SIZE);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+
+ /*init lighting */
+
+ GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
+ GLfloat mat_shininess[] = { 50.0 };
+ GLfloat light_position[] = { 1.0, 1.0, 0.0, 0.0 };
+ glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
+ glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
+ glLightfv(GL_LIGHT0, GL_POSITION, light_position);
+
+ glColorMaterial(GL_FRONT,GL_DIFFUSE); // Set Color Capability
+
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+ glEnable(GL_DEPTH_TEST);
+
+ glEnable(GL_COLOR_MATERIAL); // Enable color
+
+
+ windowWidth = WIDTH;
+ windowHeight = HEIGHT;
+ previousTime = clock();
+ eyeTheta = 0;
+ eyePhi = 0.5 * M_PI;
+ eyeRho = RHO;
+ upY = 1;
+ look[0] = 0;
+ look[1] = 0;
+ look[2] = 0;
+ gluPerspective(VIEW_ANGLE, (double)WIDTH/(double)HEIGHT, WORLD_NEAR, WORLD_FAR);
+
+ #ifdef FLYING_CAMERA
+ eye.x[0] = 0; eye.x[1] = 0; eye.x[2] = 1;
+ eye.y[0] = 0; eye.y[1] = 1; eye.y[2] = 0;
+ eye.z[0] = 1; eye.z[1] = 0; eye.z[2] = 0;
+ eye.p[0] = 0; eye.p[1] = 0; eye.p[2] = -50;
+ #endif //FLYING_CAMERA
+
+
+ //This option must be set, or when glut leaves the main loop. the exit(3) function is called... annoying
+ glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
+
+
+ #ifndef OMP_THREADED
+ glutMainLoop();
+ #endif //OMP_THREADED
+}
+
+/**
+ * @function Graphics_Display
+ * @purpose This function redraws the screen after the positions of particles
+ * have been updated.
+ * It also calls System_Compute, and checks for exit conditions, in the single-threaded version only
+ */
+void Graphics_Display()
+{
+
+ if (options.draw_graphics == false)
+ {
+ // This message is left here for when I inevitably accidentally call the function
+ fprintf(stderr, "Graphics_Display should not be called if graphics are disabled!\n");
+ exit(EXIT_FAILURE);
+ }
+
+ //Check whether the graphics thread should exit for any reason
+ if (ExitCondition())
+ {
+ glutLeaveMainLoop(); // original glut does not have this, which makes "nicely" exiting a bit annoying
+ return;
+ }
+
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+
+ #ifdef FLYING_CAMERA
+
+ gluLookAt(eye.p[0], eye.p[1], eye.p[2],
+ eye.p[0] + eye.x[0], eye.p[1] + eye.x[1], eye.p[2] + eye.x[2],
+ eye.z[0], eye.z[1], eye.z[2]);
+ #else
+ gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
+ eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
+ #endif //FLYING_CAMERA
+
+ BeforeDraw(); // Stuff to do before graphics is allowed to draw
+ // Single-thread - perform a computation step, obviously! It's not done anywhere else
+ // Multiple threads - ensure that all body positions are updated (ie: not halfway through step).
+ // (We don't care about the force and velocity variables though)
+
+ for (int i = 0; i < universe.N; ++i)
+ {
+
+ Body * b = universe.body+i;
+ glColor3f(0.0f, b->mass/1e11*100, 0.0f);
+ //glColor3f(1.0f, 0.0f, 0.0f);
+ glPushMatrix(); // to save the current matrix
+ glTranslated(scale*b->x[0], scale*b->x[1], scale*b->x[2]);
+ glutSolidSphere (BALL_SIZE, 10, 10);
+ glPopMatrix(); // restore the previous matrix
+ }
+ glFlush();
+
+ AfterDraw(); // Stuff to do after graphics is done drawing
+ // Single-thread - Nothing at all
+ // Multiple threads - signal threads it is safe to change position variables
+
+}
+
+/**
+ * @function Graphics_Keyboard
+ * @purpose This function is to manipulate with the image
+ * @param theKey key pressed
+ * @param mouseX, mouseY position of the mouse in the window
+ */
+void Graphics_Keyboard(unsigned char theKey, int mouseX, int mouseY)
+{
+ if (theKey == 'x' || theKey == 'X')
+ {
+
+ QuitProgram(false);
+
+ return;
+ }
+
+ #ifdef FLYING_CAMERA
+ switch (theKey)
+ {
+ // Translate in direction of camera
+ case 'W':
+ case 'w':
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ eye.p[i] += eye.x[i];
+ break;
+ // Translate backwards from camera direction
+ case 'S':
+ case 's':
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ eye.p[i] -= eye.x[i];
+ break;
+ // Translate left from camera direction
+ case 'A':
+ case 'a':
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ eye.p[i] -= eye.y[i];
+ break;
+ // Translate right from camera direction
+ case 'D':
+ case 'd':
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ eye.p[i] += eye.y[i];
+ break;
+ // Translate up from camera direction
+ case 'Q':
+ case 'q':
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ eye.p[i] += eye.z[i];
+ break;
+ // Translate down from camera direction
+ case 'E':
+ case 'e':
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ eye.p[i] -= eye.z[i];
+ break;
+
+ // Rotate camera direction "down"
+ // (pitch control)
+ case 'I':
+ case 'i':
+ {
+ float theta = M_PI/80.0;
+ Camera old = eye;
+
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ {
+ eye.z[i] = old.z[i] * cos(theta) + old.x[i] * sin(theta);
+ eye.x[i] = old.x[i] * cos(theta) - old.z[i] * sin(theta);
+ }
+ break;
+ }
+ // Rotate camera direction "up"
+ // (pitch control)
+ case 'K':
+ case 'k':
+ {
+ float theta = -M_PI/80.0;
+ Camera old = eye;
+
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ {
+ eye.z[i] = old.z[i] * cos(theta) + old.x[i] * sin(theta);
+ eye.x[i] = old.x[i] * cos(theta) - old.z[i] * sin(theta);
+ }
+ break;
+ }
+ // Rotate camera direction "left"
+ // (yaw control)
+ case 'J':
+ case 'j':
+ {
+ float theta = +M_PI/80.0;
+ Camera old = eye;
+
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ {
+ eye.y[i] = old.y[i] * cos(theta) + old.x[i] * sin(theta);
+ eye.x[i] = old.x[i] * cos(theta) - old.y[i] * sin(theta);
+ }
+ break;
+ }
+ // Rotate camera direction "right"
+ // (yaw control)
+ case 'L':
+ case 'l':
+ {
+ float theta = -M_PI/80.0;
+ Camera old = eye;
+
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ {
+ eye.y[i] = old.y[i] * cos(theta) + old.x[i] * sin(theta);
+ eye.x[i] = old.x[i] * cos(theta) - old.y[i] * sin(theta);
+ }
+ break;
+ }
+ // Rotate camera direction CCW about its axis
+ // (roll control)
+ case 'U':
+ case 'u':
+ {
+ float theta = -M_PI/80.0;
+ Camera old = eye;
+
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ {
+ eye.z[i] = old.z[i] * cos(theta) + old.y[i] * sin(theta);
+ eye.y[i] = old.y[i] * cos(theta) - old.z[i] * sin(theta);
+ }
+ break;
+ }
+ // Rotate camera direction CW about its axis
+ // (roll control)
+ case 'O':
+ case 'o':
+ {
+ float theta = +M_PI/80.0;
+ Camera old = eye;
+
+ for (unsigned i = 0; i < DIMENSIONS; ++i)
+ {
+ eye.z[i] = old.z[i] * cos(theta) + old.y[i] * sin(theta);
+ eye.y[i] = old.y[i] * cos(theta) - old.z[i] * sin(theta);
+ }
+ break;
+ }
+ }
+
+ /* Code used for debugging the camera
+ system("clear");
+ printf("Camera status:\n");
+ printf("Position: %f %f %f\n", eye.p[0], eye.p[1], eye.p[2]);
+ printf("x: %f %f %f (%f)\n", eye.x[0], eye.x[1], eye.x[2], sqrt(eye.x[0]*eye.x[0] + eye.x[1]*eye.x[1] + eye.x[2]*eye.x[2]));
+ printf("y: %f %f %f (%f)\n", eye.y[0], eye.y[1], eye.y[2], sqrt(eye.y[0]*eye.y[0] + eye.y[1]*eye.y[1] + eye.y[2]*eye.y[2]));
+ printf("z: %f %f %f (%f)\n", eye.z[0], eye.z[1], eye.z[2], sqrt(eye.z[0]*eye.z[0] + eye.z[1]*eye.z[1] + eye.z[2]*eye.z[2]));
+ */
+ #else // The original view code
+
+ // I like how 'I' is used three times.
+
+ if (theKey == 'i' || theKey == 'I') {
+ eyePhi -= M_PI / 20;
+ if (eyePhi == 0)
+ eyePhi = 2 * M_PI;
+ } else if (theKey == 'm' || theKey == 'I') {
+ eyePhi += M_PI / 20;
+ } else if (theKey == 'j' || theKey == 'J') {
+ eyeTheta -= M_PI / 20;
+ } else if (theKey == 'k' || theKey == 'K') {
+ eyeTheta += M_PI / 20;
+ } else if (theKey == ',') {
+ eyeRho += 0.5;
+ } else if (theKey == '.' || theKey == 'I') {
+ eyeRho -= 0.5;
+ } else if (theKey == 'w' || theKey == 'W') {
+ look[1] += 0.5;
+ } else if (theKey == 'z' || theKey == 'Z') {
+ look[1] -= 0.5;
+ } else if (theKey == 'a' || theKey == 'A') {
+ look[0] -= 0.5;
+ } else if (theKey == 's' || theKey == 'S') {
+ look[0] += 0.5;
+ } else if (theKey == '+') {
+ scale *= 1.1;
+ } else if (theKey == '-') {
+ scale *= 0.9;
+ }
+ if (sin(eyePhi) > 0) upY = 1;
+ else upY = 1;
+ #endif //FLYING_CAMERA
+}
+
+/**
+ * @function Graphics_Reshape
+ * @purpose Resize the view window
+ * @param width, height - New size of the window
+ */
+void Graphics_Reshape(int width, int height)
+{
+ double displayRatio = 1.0 * width / height;
+ windowWidth = width;
+ windowHeight = height;
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
+ glViewport(0, 0, windowWidth, windowHeight);
+}
+
+
+
git.ucc.asn.au / matches / honours.git / blobdiff
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