/**
* @file graphics.c
- * @author Sam Moore (20503628) 2012 - adapted from template program provided by UWA
+ * @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 "graphics.h" //Function declarations
+
+#include <stdlib.h>
+#include <stdio.h>
#include <time.h> // Needed for clock
#include <math.h> // Maths functions (sin, cos)
-/**
- * Variables
- */
+
+#include "graphics.h" //Function declarations
+#include "nbody.h" //The simulation
+#include <GL/freeglut.h>
+
+// --- Variable definitions --- //
double previousTime, eyeTheta, eyePhi, eyeRho;
float look[3];
int windowWidth, windowHeight, upY;
-
double scale = 1.0;
/**
- * Initialise the graphics
+ * @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_Init(void)
+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);
look[1] = 0;
look[2] = 0;
gluPerspective(VIEW_ANGLE, (double)WIDTH/(double)HEIGHT, WORLD_NEAR, WORLD_FAR);
+
+ glutMainLoop();
}
/**
- * This function redraws the screen after the positions of particles
- * have been updated
+ * @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();
gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
+ 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;
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
+
}
/**
- * This function is to manipulate with the image
+ * @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')
{
- exit(EXIT_SUCCESS);
+ QuitProgram(false);
+ return;
}
if (theKey == 'i' || theKey == 'I') {
}
/**
- * Resize the view window
+ * @function Graphics_Reshape
+ * @purpose Resize the view window
+ * @param width, height - New size of the window
*/
void Graphics_Reshape(int width, int height)
{
}
-/**
- * This function is called repeatedly by graphics library. You can consider
- * it as main loop in the program.
- */
-void Graphics_Animate(void)
-{
- System_Compute(&universe); //Compute and update new positions for the time step
- Graphics_Display(); // Display needs to be called to redraw the screen
-}
+
git.ucc.asn.au / matches / honours.git / blobdiff
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