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sample.cpp
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sample.cpp
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#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <omp.h>
#define _USE_MATH_DEFINES
#include <math.h>
#ifdef WIN32
#include <windows.h>
#pragma warning(disable:4996)
#endif
#ifdef WIN32
#include "glew.h"
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include "glut.h"
#include "glui.h"
#include "cl.h"
#include "cl_gl.h"
// title of these windows:
const char *WINDOWTITLE = { "OpenCL/OpenGL Particle System -- Joe Parallel" };
const char *GLUITITLE = { "User Interface Window" };
// random parameters:
const float XMIN = { -100.0 };
const float XMAX = { 100.0 };
const float YMIN = { -100.0 };
const float YMAX = { 100.0 };
const float ZMIN = { -100.0 };
const float ZMAX = { 100.0 };
const float VMIN = { -100. };
const float VMAX = { 100. };
const int NUM_PARTICLES = 1024*1024;
const int LOCAL_SIZE = 64;
const char *CL_FILE_NAME = { "particles.cl" };
const char *CL_BINARY_NAME = { "particles.nv" };
const int GLUITRUE = { true };
const int GLUIFALSE = { false };
#define ESCAPE 0x1b
const int INIT_WINDOW_SIZE = { 700 }; // window size in pixels
const float ANGFACT = { 1. };
const float SCLFACT = { 0.005f };
const float MINSCALE = { 0.001f };
const int LEFT = { 4 };
const int MIDDLE = { 2 };
const int RIGHT = { 1 };
enum Projections
{
ORTHO,
PERSP
};
enum ButtonVals
{
GO,
PAUSE,
RESET,
QUIT
};
const float BACKCOLOR[ ] = { 0., 0., 0., 0. };
const GLfloat AXES_COLOR[ ] = { 1., .5, 0. };
const GLfloat AXES_WIDTH = { 3. };
//
// structs we will need later:
struct xyzw
{
float x, y, z, w;
};
struct rgba
{
float r, g, b, a;
};
// non-constant global variables:
int ActiveButton; // current button that is down
GLuint AxesList; // list to hold the axes
int AxesOn; // ON or OFF
GLUI * Glui; // instance of glui window
int GluiWindow; // the glut id for the glui window
int MainWindow; // window id for main graphics window
int Paused;
GLfloat RotMatrix[4][4]; // set by glui rotation widget
float Scale, Scale2; // scaling factors
GLuint SphereList;
int WhichProjection; // ORTHO or PERSP
int Xmouse, Ymouse; // mouse values
float Xrot, Yrot; // rotation angles in degrees
float TransXYZ[3]; // set by glui translation widgets
double ElapsedTime;
int ShowPerformance;
size_t GlobalWorkSize[3] = { NUM_PARTICLES, 1, 1 };
size_t LocalWorkSize[3] = { LOCAL_SIZE, 1, 1 };
GLuint hPobj;
GLuint hCobj;
cl_mem dPobj;
cl_mem dCobj;
struct xyzw * hVel;
cl_mem dVel;
cl_command_queue CmdQueue;
cl_device_id Device;
cl_kernel Kernel;
cl_platform_id Platform;
cl_program Program;
cl_platform_id PlatformID;
// function prototypes:
void PrintOpenclInfo();
void SelectOpenclDevice();
char * Vendor( cl_uint );
char * Type( cl_device_type );
inline
float
SQR( float x )
{
return x * x;
}
void Animate( );
void Axes( float );
void Buttons( int );
void Display( );
void DoRasterString( float, float, float, char * );
void DoStrokeString( float, float, float, float, char * );
void InitCL( );
void InitGlui( );
void InitGraphics( );
void InitLists( );
bool IsCLExtensionSupported( const char * );
void Keyboard( unsigned char, int, int );
void MouseButton( int, int, int, int );
void MouseMotion( int, int );
void PrintCLError( cl_int, char * = "", FILE * = stderr );
void PrintOpenclInfo();
void Quit( );
float Ranf( float, float );
void Reset( );
void ResetParticles( );
void Resize( int, int );
void SelectOpenclDevice();
void Traces( int );
void Visibility( int );
//
// main Program:
//
int
main( int argc, char *argv[ ] )
{
glutInit( &argc, argv );
InitGraphics( );
InitLists( );
InitCL( );
Reset( );
InitGlui( );
glutMainLoop( );
return 0;
}
void
Animate( )
{
cl_int status;
double time0, time1;
// acquire the vertex buffers from opengl:
glutSetWindow( MainWindow );
glFinish( );
status = clEnqueueAcquireGLObjects( CmdQueue, 1, &dPobj, 0, NULL, NULL );
PrintCLError( status, "clEnqueueAcquireGLObjects (1): " );
status = clEnqueueAcquireGLObjects( CmdQueue, 1, &dCobj, 0, NULL, NULL );
PrintCLError( status, "clEnqueueAcquireGLObjects (2): " );
if( ShowPerformance )
time0 = omp_get_wtime( );
// 11. enqueue the Kernel object for execution:
cl_event wait;
status = clEnqueueNDRangeKernel( CmdQueue, Kernel, 1, NULL, GlobalWorkSize, LocalWorkSize, 0, NULL, &wait );
PrintCLError( status, "clEnqueueNDRangeKernel: " );
if( ShowPerformance )
{
status = clWaitForEvents( 1, &wait );
PrintCLError( status, "clWaitForEvents: " );
time1 = omp_get_wtime( );
ElapsedTime = time1 - time0;
}
clFinish( CmdQueue );
status = clEnqueueReleaseGLObjects( CmdQueue, 1, &dCobj, 0, NULL, NULL );
PrintCLError( status, "clEnqueueReleaseGLObjects (2): " );
status = clEnqueueReleaseGLObjects( CmdQueue, 1, &dPobj, 0, NULL, NULL );
PrintCLError( status, "clEnqueueReleaseGLObjects (2): " );
glutSetWindow( MainWindow );
glutPostRedisplay( );
}
//
// glui buttons callback:
//
void
Buttons( int id )
{
cl_int status;
switch( id )
{
case GO:
GLUI_Master.set_glutIdleFunc( Animate );
break;
case PAUSE:
Paused = ! Paused;
if( Paused )
GLUI_Master.set_glutIdleFunc( NULL );
else
GLUI_Master.set_glutIdleFunc( Animate );
break;
case RESET:
Reset( );
ResetParticles( );
status = clEnqueueWriteBuffer( CmdQueue, dVel, CL_FALSE, 0, 4*sizeof(float)*NUM_PARTICLES, hVel, 0, NULL, NULL );
PrintCLError( status, "clEneueueWriteBuffer: " );
GLUI_Master.set_glutIdleFunc( NULL );
Glui->sync_live( );
glutSetWindow( MainWindow );
glutPostRedisplay( );
break;
case QUIT:
Quit( );
break;
default:
fprintf( stderr, "Don't know what to do with Button ID %d\n", id );
}
}
//
// draw the complete scene:
//
void
Display( )
{
glutSetWindow( MainWindow );
glDrawBuffer( GL_BACK );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable( GL_DEPTH_TEST );
glShadeModel( GL_FLAT );
GLsizei vx = glutGet( GLUT_WINDOW_WIDTH );
GLsizei vy = glutGet( GLUT_WINDOW_HEIGHT );
GLsizei v = vx < vy ? vx : vy; // minimum dimension
GLint xl = ( vx - v ) / 2;
GLint yb = ( vy - v ) / 2;
glViewport( xl, yb, v, v );
glMatrixMode( GL_PROJECTION );
glLoadIdentity( );
if( WhichProjection == ORTHO )
glOrtho( -300., 300., -300., 300., 0.1, 2000. );
else
gluPerspective( 50., 1., 0.1, 2000. );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity( );
gluLookAt( 0., -100., 800., 0., -100., 0., 0., 1., 0. );
glTranslatef( (GLfloat)TransXYZ[0], (GLfloat)TransXYZ[1], -(GLfloat)TransXYZ[2] );
glRotatef( (GLfloat)Yrot, 0., 1., 0. );
glRotatef( (GLfloat)Xrot, 1., 0., 0. );
glMultMatrixf( (const GLfloat *) RotMatrix );
glScalef( (GLfloat)Scale, (GLfloat)Scale, (GLfloat)Scale );
float scale2 = 1.f + Scale2; // because glui translation starts at 0.
if( scale2 < MINSCALE )
scale2 = MINSCALE;
glScalef( (GLfloat)scale2, (GLfloat)scale2, (GLfloat)scale2 );
glDisable( GL_FOG );
if( AxesOn != GLUIFALSE )
glCallList( AxesList );
// ****************************************
// Here is where you draw the current state of the particles:
// ****************************************
glBindBuffer( GL_ARRAY_BUFFER, hPobj );
glVertexPointer( 4, GL_FLOAT, 0, (void *)0 );
glEnableClientState( GL_VERTEX_ARRAY );
glBindBuffer( GL_ARRAY_BUFFER, hCobj );
glColorPointer( 4, GL_FLOAT, 0, (void *)0 );
glEnableClientState( GL_COLOR_ARRAY );
glPointSize( 3. );
glDrawArrays( GL_POINTS, 0, NUM_PARTICLES );
glPointSize( 1. );
glDisableClientState( GL_VERTEX_ARRAY );
glDisableClientState( GL_COLOR_ARRAY );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
// ****************************************
// Here is where you draw your spheres. You define them, however, in the InitLists( ) function.
// ****************************************
glCallList( SphereList );
if( ShowPerformance )
{
char str[128];
sprintf( str, "%6.1f GigaParticles/Sec", (float)NUM_PARTICLES/ElapsedTime/1000000000. );
glDisable( GL_DEPTH_TEST );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluOrtho2D( 0., 100., 0., 100. );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glColor3f( 1., 1., 1. );
DoRasterString( 5., 95., 0., str );
}
glutSwapBuffers( );
glFlush( );
}
//
// use glut to display a string of characters using a raster font:
//
void
DoRasterString( float x, float y, float z, char *s )
{
char c; // one character to print
glRasterPos3f( (GLfloat)x, (GLfloat)y, (GLfloat)z );
for( ; ( c = *s ) != '\0'; s++ )
{
glutBitmapCharacter( GLUT_BITMAP_TIMES_ROMAN_24, c );
}
}
//
// use glut to display a string of characters using a stroke font:
//
void
DoStrokeString( float x, float y, float z, float ht, char *s )
{
char c; // one character to print
glPushMatrix( );
glTranslatef( (GLfloat)x, (GLfloat)y, (GLfloat)z );
float sf = ht / ( 119.05f + 33.33f );
glScalef( (GLfloat)sf, (GLfloat)sf, (GLfloat)sf );
for( ; ( c = *s ) != '\0'; s++ )
{
glutStrokeCharacter( GLUT_STROKE_ROMAN, c );
}
glPopMatrix( );
}
//
// initialize the opencl stuff:
//
void
InitCL( )
{
// show us what we've got here:
PrintOpenclInfo();
// pick which opencl device to use
// this fills the globals Platform and Device:
SelectOpenclDevice();
// see if we can even open the opencl Kernel Program
// (no point going on if we can't):
FILE *fp = fopen( CL_FILE_NAME, "r" );
if( fp == NULL )
{
fprintf( stderr, "Cannot open OpenCL source file '%s'\n", CL_FILE_NAME );
return;
}
// 2. allocate the host memory buffers:
cl_int status; // returned status from opencl calls
// test against CL_SUCCESS
// since this is an opengl interoperability program,
// check if the opengl sharing extension is supported,
// (no point going on if it isn't):
// (we need the Device in order to ask, so can't do it any sooner than here)
if( IsCLExtensionSupported( "cl_khr_gl_sharing" ) )
{
fprintf( stderr, "cl_khr_gl_sharing is supported.\n" );
}
else
{
fprintf( stderr, "cl_khr_gl_sharing is not supported -- sorry.\n" );
return;
}
// 3. create an opencl context based on the opengl context:
cl_context_properties props[ ] =
{
CL_GL_CONTEXT_KHR, (cl_context_properties) wglGetCurrentContext( ),
CL_WGL_HDC_KHR, (cl_context_properties) wglGetCurrentDC( ),
CL_CONTEXT_PLATFORM, (cl_context_properties) Platform,
0
};
cl_context Context = clCreateContext( props, 1, &Device, NULL, NULL, &status );
PrintCLError( status, "clCreateContext: " );
// 4. create an opencl command queue:
CmdQueue = clCreateCommandQueue( Context, Device, 0, &status );
if( status != CL_SUCCESS )
fprintf( stderr, "clCreateCommandQueue failed\n" );
// create the velocity array and the opengl vertex array buffer and color array buffer:
delete [ ] hVel;
hVel = new struct xyzw [ NUM_PARTICLES ];
glGenBuffers( 1, &hPobj );
glBindBuffer( GL_ARRAY_BUFFER, hPobj );
glBufferData( GL_ARRAY_BUFFER, 4 * NUM_PARTICLES * sizeof(float), NULL, GL_STATIC_DRAW );
glGenBuffers( 1, &hCobj );
glBindBuffer( GL_ARRAY_BUFFER, hCobj );
glBufferData( GL_ARRAY_BUFFER, 4 * NUM_PARTICLES * sizeof(float), NULL, GL_STATIC_DRAW );
glBindBuffer( GL_ARRAY_BUFFER, 0 ); // unbind the buffer
// fill those arrays and buffers:
ResetParticles( );
// 5. create the opencl version of the opengl buffers:
dPobj = clCreateFromGLBuffer( Context, CL_MEM_READ_WRITE, hPobj, &status );
PrintCLError( status, "clCreateFromGLBuffer (1)" );
dCobj = clCreateFromGLBuffer( Context, CL_MEM_READ_WRITE, hCobj, &status );
PrintCLError( status, "clCreateFromGLBuffer (2)" );
// 5. create the opencl version of the velocity array:
dVel = clCreateBuffer( Context, CL_MEM_READ_WRITE, 4*sizeof(float)*NUM_PARTICLES, NULL, &status );
PrintCLError( status, "clCreateBuffer: " );
// 6. enqueue the command to write the data from the host buffers to the Device buffers:
status = clEnqueueWriteBuffer( CmdQueue, dVel, CL_FALSE, 0, 4*sizeof(float)*NUM_PARTICLES, hVel, 0, NULL, NULL );
PrintCLError( status, "clEneueueWriteBuffer: " );
// 7. read the Kernel code from a file:
fseek( fp, 0, SEEK_END );
size_t fileSize = ftell( fp );
fseek( fp, 0, SEEK_SET );
char *clProgramText = new char[ fileSize+1 ]; // leave room for '\0'
size_t n = fread( clProgramText, 1, fileSize, fp );
clProgramText[fileSize] = '\0';
fclose( fp );
// create the text for the Kernel Program:
char *strings[1];
strings[0] = clProgramText;
Program = clCreateProgramWithSource( Context, 1, (const char **)strings, NULL, &status );
if( status != CL_SUCCESS )
fprintf( stderr, "clCreateProgramWithSource failed\n" );
delete [ ] clProgramText;
// 8. compile and link the Kernel code:
char *options = { "" };
status = clBuildProgram( Program, 1, &Device, options, NULL, NULL );
if( status != CL_SUCCESS )
{
size_t size;
clGetProgramBuildInfo( Program, Device, CL_PROGRAM_BUILD_LOG, 0, NULL, &size );
cl_char *log = new cl_char[ size ];
clGetProgramBuildInfo( Program, Device, CL_PROGRAM_BUILD_LOG, size, log, NULL );
fprintf( stderr, "clBuildProgram failed:\n%s\n", log );
delete [ ] log;
}
// 9. create the Kernel object:
Kernel = clCreateKernel( Program, "Particle", &status );
PrintCLError( status, "clCreateKernel failed: " );
// 10. setup the arguments to the Kernel object:
status = clSetKernelArg( Kernel, 0, sizeof(cl_mem), &dPobj );
PrintCLError( status, "clSetKernelArg (1): " );
status = clSetKernelArg( Kernel, 1, sizeof(cl_mem), &dVel );
PrintCLError( status, "clSetKernelArg (2): " );
status = clSetKernelArg( Kernel, 2, sizeof(cl_mem), &dCobj );
PrintCLError( status, "clSetKernelArg (3): " );
}
//
// initialize the glui window:
//
void
InitGlui( )
{
glutInitWindowPosition( INIT_WINDOW_SIZE + 50, 0 );
Glui = GLUI_Master.create_glui( (char *) GLUITITLE );
Glui->add_statictext( (char *) GLUITITLE );
Glui->add_separator( );
Glui->add_checkbox( "Axes", &AxesOn );
Glui->add_checkbox( "Perspective", &WhichProjection );
Glui->add_checkbox( "Show Performance", &ShowPerformance );
GLUI_Panel *panel = Glui->add_panel( "Object Transformation" );
GLUI_Rotation *rot = Glui->add_rotation_to_panel( panel, "Rotation", (float *) RotMatrix );
rot->set_spin( 1.0 );
Glui->add_column_to_panel( panel, GLUIFALSE );
GLUI_Translation *scale = Glui->add_translation_to_panel( panel, "Scale", GLUI_TRANSLATION_Y , &Scale2 );
scale->set_speed( 0.01f );
Glui->add_column_to_panel( panel, FALSE );
GLUI_Translation *trans = Glui->add_translation_to_panel( panel, "Trans XY", GLUI_TRANSLATION_XY, &TransXYZ[0] );
trans->set_speed( 1.1f );
Glui->add_column_to_panel( panel, FALSE );
trans = Glui->add_translation_to_panel( panel, "Trans Z", GLUI_TRANSLATION_Z , &TransXYZ[2] );
trans->set_speed( 1.1f );
panel = Glui->add_panel( "", FALSE );
Glui->add_button_to_panel( panel, "Go !", GO, (GLUI_Update_CB) Buttons );
Glui->add_column_to_panel( panel, FALSE );
Glui->add_button_to_panel( panel, "Pause", PAUSE, (GLUI_Update_CB) Buttons );
Glui->add_column_to_panel( panel, FALSE );
Glui->add_button_to_panel( panel, "Reset", RESET, (GLUI_Update_CB) Buttons );
Glui->add_column_to_panel( panel, FALSE );
Glui->add_button_to_panel( panel, "Quit", QUIT, (GLUI_Update_CB) Buttons );
Glui->set_main_gfx_window( MainWindow );
GLUI_Master.set_glutIdleFunc( NULL );
}
//
// initialize the glut and OpenGL libraries:
// also setup display lists and callback functions
//
void
InitGraphics( )
{
glutInitDisplayMode( GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( INIT_WINDOW_SIZE, INIT_WINDOW_SIZE );
MainWindow = glutCreateWindow( WINDOWTITLE );
glutSetWindowTitle( WINDOWTITLE );
glClearColor( BACKCOLOR[0], BACKCOLOR[1], BACKCOLOR[2], BACKCOLOR[3] );
// setup the callback routines:
glutSetWindow( MainWindow );
glutDisplayFunc( Display );
glutReshapeFunc( Resize );
glutKeyboardFunc( Keyboard );
glutMouseFunc( MouseButton );
glutMotionFunc( MouseMotion );
glutVisibilityFunc( Visibility );
#ifdef WIN32
GLenum err = glewInit();
if( err != GLEW_OK )
{
fprintf( stderr, "glewInit Error\n" );
}
#endif
}
//
// initialize the display lists that will not change:
//
void
InitLists( )
{
SphereList = glGenLists( 1 );
glNewList( SphereList, GL_COMPILE );
// ****************************************
// Here is where the first sphere is drawn.
// It is centered at (-100,-800.,0.) with a radius of 600.
// This had better match the definition of the first sphere
// in the .cl file
// ****************************************
glColor3f( .9f, .9f, 0. ); // 0. <= r,g,b <= 1.
glPushMatrix( );
glTranslatef( -100.f, -800.f, 0.f );
glutWireSphere( 600.f, 100, 100 );
glPopMatrix( );
// ****************************************
// Here is where the second sphere is drawn.
// This had better match the definition of the second sphere
// in the .cl file
// ****************************************
// do this for yourself...
glEndList( );
AxesList = glGenLists( 1 );
glNewList( AxesList, GL_COMPILE );
glColor3fv( AXES_COLOR );
glLineWidth( AXES_WIDTH );
Axes( 150. );
glLineWidth( 1. );
glEndList( );
}
//
// the keyboard callback:
//
void
Keyboard( unsigned char c, int x, int y )
{
switch( c )
{
case 'o':
case 'O':
WhichProjection = ORTHO;
break;
case 'p':
case 'P':
WhichProjection = PERSP;
break;
case 'q':
case 'Q':
case ESCAPE:
Buttons( QUIT ); // will not return here
break; // happy compiler
default:
fprintf( stderr, "Don't know what to do with keyboard hit: '%c' (0x%0x)\n", c, c );
}
Glui->sync_live( );
glutSetWindow( MainWindow );
glutPostRedisplay( );
}
//
// called when the mouse button transitions down or up:
//
void
MouseButton( int button, int state, int x, int y )
{
int b; // LEFT, MIDDLE, or RIGHT
switch( button )
{
case GLUT_LEFT_BUTTON:
b = LEFT; break;
case GLUT_MIDDLE_BUTTON:
b = MIDDLE; break;
case GLUT_RIGHT_BUTTON:
b = RIGHT; break;
default:
b = 0;
fprintf( stderr, "Unknown mouse button: %d\n", button );
}
// button down sets the bit, up clears the bit:
if( state == GLUT_DOWN )
{
Xmouse = x;
Ymouse = y;
ActiveButton |= b; // set the proper bit
}
else
{
ActiveButton &= ~b; // clear the proper bit
}
}
//
// called when the mouse moves while a button is down:
//
void
MouseMotion( int x, int y )
{
int dx = x - Xmouse; // change in mouse coords
int dy = y - Ymouse;
if( ActiveButton & LEFT )
{
Xrot += ( ANGFACT*dy );
Yrot += ( ANGFACT*dx );
}
if( ActiveButton & MIDDLE )
{
Scale += SCLFACT * (float) ( dx - dy );
// keep object from turning inside-out or disappearing:
if( Scale < MINSCALE )
Scale = MINSCALE;
}
Xmouse = x; // new current position
Ymouse = y;
glutSetWindow( MainWindow );
glutPostRedisplay( );
}
//
// reset the transformations and the colors:
//
// this only sets the global variables --
// the glut main loop is responsible for redrawing the scene
//
void
Reset( )
{
ActiveButton = 0;
AxesOn = GLUIFALSE;
Paused = GLUIFALSE;
Scale = 1.0;
Scale2 = 0.0; // because add 1. to it in Display( )
ShowPerformance = GLUIFALSE;
WhichProjection = PERSP;
Xrot = Yrot = 0.;
TransXYZ[0] = TransXYZ[1] = TransXYZ[2] = 0.;
RotMatrix[0][1] = RotMatrix[0][2] = RotMatrix[0][3] = 0.;
RotMatrix[1][0] = RotMatrix[1][2] = RotMatrix[1][3] = 0.;
RotMatrix[2][0] = RotMatrix[2][1] = RotMatrix[2][3] = 0.;
RotMatrix[3][0] = RotMatrix[3][1] = RotMatrix[3][3] = 0.;
RotMatrix[0][0] = RotMatrix[1][1] = RotMatrix[2][2] = RotMatrix[3][3] = 1.;
}
void
ResetParticles( )
{
glBindBuffer( GL_ARRAY_BUFFER, hPobj );
struct xyzw *points = (struct xyzw *) glMapBuffer( GL_ARRAY_BUFFER, GL_WRITE_ONLY );
for( int i = 0; i < NUM_PARTICLES; i++ )
{
points[i].x = Ranf( XMIN, XMAX );
points[i].y = Ranf( YMIN, YMAX );
points[i].z = Ranf( ZMIN, ZMAX );
points[i].w = 1.;
}
glUnmapBuffer( GL_ARRAY_BUFFER );
glBindBuffer( GL_ARRAY_BUFFER, hCobj );
struct rgba *colors = (struct rgba *) glMapBuffer( GL_ARRAY_BUFFER, GL_WRITE_ONLY );
for( int i = 0; i < NUM_PARTICLES; i++ )
{
colors[i].r = Ranf( .3f, 1. );
colors[i].g = Ranf( .3f, 1. );
colors[i].b = Ranf( .3f, 1. );
colors[i].a = 1.;
}
glUnmapBuffer( GL_ARRAY_BUFFER );
for( int i = 0; i < NUM_PARTICLES; i++ )
{
hVel[i].x = Ranf( VMIN, VMAX );
hVel[i].y = Ranf( 0., VMAX );
hVel[i].z = Ranf( VMIN, VMAX );
}
}
void
Resize( int width, int height )
{
glutSetWindow( MainWindow );
glutPostRedisplay( );
}
void
Visibility ( int state )
{
if( state == GLUT_VISIBLE )
{
glutSetWindow( MainWindow );
glutPostRedisplay( );
}
else
{
// could optimize by keeping track of the fact
// that the window is not visible and avoid
// animating or redrawing it ...
}
}
// the stroke characters 'X' 'Y' 'Z' :
static float xx[ ] = {
0., 1., 0., 1.
};
static float xy[ ] = {
-.5, .5, .5, -.5
};
static int xorder[ ] = {
1, 2, -3, 4
};
static float yx[ ] = {
0., 0., -.5, .5
};
static float yy[ ] = {
0., .6f, 1., 1.
};
static int yorder[ ] = {
1, 2, 3, -2, 4
};
static float zx[ ] = {
1., 0., 1., 0., .25, .75
};
static float zy[ ] = {
.5, .5, -.5, -.5, 0., 0.
};
static int zorder[ ] = {
1, 2, 3, 4, -5, 6
};
// fraction of the length to use as height of the characters:
#define LENFRAC 0.10
// fraction of length to use as start location of the characters:
#define BASEFRAC 1.10
//
// Draw a set of 3D axes:
// (length is the axis length in world coordinates)
//
void
Axes( float length )
{
glBegin( GL_LINE_STRIP );
glVertex3f( length, 0., 0. );
glVertex3f( 0., 0., 0. );
glVertex3f( 0., length, 0. );
glEnd( );
glBegin( GL_LINE_STRIP );
glVertex3f( 0., 0., 0. );
glVertex3f( 0., 0., length );
glEnd( );
float fact = (float)LENFRAC * length;
float base = (float)BASEFRAC * length;
glBegin( GL_LINE_STRIP );
for( int i = 0; i < 4; i++ )
{
int j = xorder[i];
if( j < 0 )
{
glEnd( );
glBegin( GL_LINE_STRIP );
j = -j;
}
j--;
glVertex3f( base + fact*xx[j], fact*xy[j], 0.0 );
}