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#include <GL/openglut.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
/*
* This macro is only intended to be used on arrays, of course.
*/
#define NUMBEROF(x) ((sizeof(x))/(sizeof(x[0])))
/*
* These global variables control which object is drawn,
* and how it is drawn. No object uses all of these
* variables.
*/
static int function_index;
static int slices = 16;
static int stacks = 16;
static double irad = .25;
static double orad = 1.0;
static int depth = 4;
static const double offset[ 3 ] = { 0, 0, 0 };
typedef struct
{
const char * const name;
void (*solid) (void);
void (*wire) (void);
} entry;
#define ENTRY(e) {#e, drawSolid##e, drawWire##e}
static void shapesPrintf (int row, int col, const char *fmt, ...)
{
static char buf[256];
int viewport[4];
va_list args;
va_start(args, fmt);
(void) vsprintf (buf, fmt, args);
va_end(args);
glGetIntegerv(GL_VIEWPORT,viewport);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0,viewport[2],0,viewport[3],-1,1);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
static void
resize(int width, int height)
{
const float ar = (float) width / (float) height;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if( ar > .5 )
glFrustum( -ar, ar, -1.0, 1.0, 2.0, 100.0 );
else
glFrustum( -1.0, 1.0, -1/ar, 1/ar, 2.0, 100.0 );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity() ;
}
static void
display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_LIGHTING);
glColor3d(1,0,0);
glPushMatrix();
glTranslated(0,1.2,-6);
glPopMatrix();
glPushMatrix();
glTranslated(0,-1.2,-6);
glPopMatrix();
glDisable(GL_LIGHTING);
glColor3d(0.1,0.1,0.4);
shapesPrintf (1, 3, "Shape PgUp PgDn: %s");
shapesPrintf (2, 3, " Slices +-: %d Stacks <>: %d", slices, stacks);
shapesPrintf (3, 3, " nSides +-: %d nRings <>: %d", slices, stacks);
shapesPrintf (4, 3, " Depth (): %d", depth);
shapesPrintf (5, 3, " Outer radius Up Down : %f", orad);
shapesPrintf (6, 3, " Inner radius Left Right: %f", irad);
}
const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[] = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[] = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
/* Program entry point */
int
main(int argc, char *argv[])
{
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
return EXIT_SUCCESS;
} |
