initial rev
This commit is contained in:
parent
64b7da799f
commit
bb1119fd44
|
@ -0,0 +1,358 @@
|
|||
/* $Id: gloss.c,v 1.1 1999/10/22 20:34:57 brianp Exp $ */
|
||||
|
||||
/*
|
||||
* Specular reflection demo. The specular hightlight is modulated by
|
||||
* a sphere-mapped texture. The result is a high-gloss surface.
|
||||
* NOTE: you really need hardware acceleration for this.
|
||||
*
|
||||
* Command line options:
|
||||
* -info print GL implementation information
|
||||
*
|
||||
*
|
||||
* Brian Paul October 22, 1999 This program is in the public domain.
|
||||
*/
|
||||
|
||||
|
||||
#include <assert.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <math.h>
|
||||
#include <GL/glut.h>
|
||||
|
||||
#include "../util/readtex.c" /* I know, this is a hack. */
|
||||
|
||||
#define SPECULAR_TEXTURE_FILE "../images/reflect.rgb"
|
||||
#define BASE_TEXTURE_FILE "../images/tile.rgb"
|
||||
|
||||
/* Menu items */
|
||||
#define DO_SPEC_TEXTURE 1
|
||||
#define OBJECT 2
|
||||
#define ANIMATE 3
|
||||
#define QUIT 100
|
||||
|
||||
static GLuint CylinderObj = 0;
|
||||
static GLuint TeapotObj = 0;
|
||||
static GLuint Object = 0;
|
||||
static GLboolean Animate = GL_TRUE;
|
||||
|
||||
static GLfloat Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
|
||||
static GLfloat DXrot = 1.0, DYrot = 2.5;
|
||||
|
||||
static GLfloat Black[4] = { 0, 0, 0, 0 };
|
||||
static GLfloat White[4] = { 1, 1, 1, 1 };
|
||||
static GLfloat Diffuse[4] = { .3, .3, 1.0, 1.0 }; /* blue */
|
||||
static GLfloat Shininess = 15;
|
||||
|
||||
static GLuint BaseTexture, SpecularTexture;
|
||||
static GLboolean DoSpecTexture = GL_TRUE;
|
||||
|
||||
/* performance info */
|
||||
static GLint T0 = 0;
|
||||
static GLint Frames = 0;
|
||||
|
||||
|
||||
|
||||
|
||||
static void Idle( void )
|
||||
{
|
||||
if (Animate) {
|
||||
Xrot += DXrot;
|
||||
Yrot += DYrot;
|
||||
glutPostRedisplay();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void Display( void )
|
||||
{
|
||||
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
|
||||
|
||||
glPushMatrix();
|
||||
glRotatef(Xrot, 1.0, 0.0, 0.0);
|
||||
glRotatef(Yrot, 0.0, 1.0, 0.0);
|
||||
glRotatef(Zrot, 0.0, 0.0, 1.0);
|
||||
|
||||
/* First pass: diffuse lighting with base texture */
|
||||
glMaterialfv(GL_FRONT, GL_DIFFUSE, Diffuse);
|
||||
glMaterialfv(GL_FRONT, GL_SPECULAR, Black);
|
||||
glEnable(GL_TEXTURE_2D);
|
||||
glBindTexture(GL_TEXTURE_2D, BaseTexture);
|
||||
glMatrixMode(GL_TEXTURE);
|
||||
glLoadIdentity();
|
||||
glScalef(2.0, 2.0, 2.0);
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glCallList(Object);
|
||||
glMatrixMode(GL_TEXTURE);
|
||||
glLoadIdentity();
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
|
||||
/* Second pass: specular lighting with reflection texture */
|
||||
glBlendFunc(GL_ONE, GL_ONE); /* add */
|
||||
glEnable(GL_BLEND);
|
||||
glDepthFunc(GL_LEQUAL);
|
||||
glMaterialfv(GL_FRONT, GL_DIFFUSE, Black);
|
||||
glMaterialfv(GL_FRONT, GL_SPECULAR, White);
|
||||
if (DoSpecTexture) {
|
||||
glBindTexture(GL_TEXTURE_2D, SpecularTexture);
|
||||
glEnable(GL_TEXTURE_GEN_S);
|
||||
glEnable(GL_TEXTURE_GEN_T);
|
||||
}
|
||||
else {
|
||||
glDisable(GL_TEXTURE_2D);
|
||||
}
|
||||
glCallList(Object);
|
||||
glDisable(GL_TEXTURE_GEN_S);
|
||||
glDisable(GL_TEXTURE_GEN_T);
|
||||
glDisable(GL_BLEND);
|
||||
glDepthFunc(GL_LESS);
|
||||
|
||||
glPopMatrix();
|
||||
|
||||
glutSwapBuffers();
|
||||
|
||||
if (Animate) {
|
||||
GLint t = glutGet(GLUT_ELAPSED_TIME);
|
||||
Frames++;
|
||||
if (t - T0 >= 5000) {
|
||||
GLfloat seconds = (t - T0) / 1000.0;
|
||||
GLfloat fps = Frames / seconds;
|
||||
printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
|
||||
T0 = t;
|
||||
Frames = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void Reshape( int width, int height )
|
||||
{
|
||||
GLfloat h = 30.0;
|
||||
GLfloat w = h * width / height;
|
||||
glViewport( 0, 0, width, height );
|
||||
glMatrixMode( GL_PROJECTION );
|
||||
glLoadIdentity();
|
||||
glFrustum( -w, w, -h, h, 150.0, 500.0 );
|
||||
glMatrixMode( GL_MODELVIEW );
|
||||
glLoadIdentity();
|
||||
glTranslatef( 0.0, 0.0, -380.0 );
|
||||
}
|
||||
|
||||
|
||||
static void ToggleAnimate(void)
|
||||
{
|
||||
Animate = !Animate;
|
||||
if (Animate) {
|
||||
glutIdleFunc( Idle );
|
||||
T0 = glutGet(GLUT_ELAPSED_TIME);
|
||||
Frames = 0;
|
||||
}
|
||||
else {
|
||||
glutIdleFunc( NULL );
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void ModeMenu(int entry)
|
||||
{
|
||||
if (entry==ANIMATE) {
|
||||
ToggleAnimate();
|
||||
}
|
||||
else if (entry==DO_SPEC_TEXTURE) {
|
||||
DoSpecTexture = !DoSpecTexture;
|
||||
}
|
||||
else if (entry==OBJECT) {
|
||||
if (Object == TeapotObj)
|
||||
Object = CylinderObj;
|
||||
else
|
||||
Object = TeapotObj;
|
||||
}
|
||||
else if (entry==QUIT) {
|
||||
exit(0);
|
||||
}
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
static void Key( unsigned char key, int x, int y )
|
||||
{
|
||||
(void) x;
|
||||
(void) y;
|
||||
switch (key) {
|
||||
case 's':
|
||||
Shininess--;
|
||||
if (Shininess < 0.0)
|
||||
Shininess = 0.0;
|
||||
glMaterialf(GL_FRONT, GL_SHININESS, Shininess);
|
||||
printf("Shininess = %g\n", Shininess);
|
||||
break;
|
||||
case 'S':
|
||||
Shininess++;
|
||||
if (Shininess > 128.0)
|
||||
Shininess = 128.0;
|
||||
glMaterialf(GL_FRONT, GL_SHININESS, Shininess);
|
||||
printf("Shininess = %g\n", Shininess);
|
||||
break;
|
||||
case ' ':
|
||||
ToggleAnimate();
|
||||
break;
|
||||
case 27:
|
||||
exit(0);
|
||||
break;
|
||||
}
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
static void SpecialKey( int key, int x, int y )
|
||||
{
|
||||
float step = 3.0;
|
||||
(void) x;
|
||||
(void) y;
|
||||
|
||||
switch (key) {
|
||||
case GLUT_KEY_UP:
|
||||
Xrot += step;
|
||||
break;
|
||||
case GLUT_KEY_DOWN:
|
||||
Xrot -= step;
|
||||
break;
|
||||
case GLUT_KEY_LEFT:
|
||||
Yrot += step;
|
||||
break;
|
||||
case GLUT_KEY_RIGHT:
|
||||
Yrot -= step;
|
||||
break;
|
||||
}
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
static void Init( int argc, char *argv[] )
|
||||
{
|
||||
/* Cylinder object */
|
||||
{
|
||||
static GLfloat height = 100.0;
|
||||
static GLfloat radius = 40.0;
|
||||
GLUquadricObj *q = gluNewQuadric();
|
||||
assert(q);
|
||||
gluQuadricTexture(q, GL_TRUE);
|
||||
|
||||
CylinderObj = glGenLists(1);
|
||||
glNewList(CylinderObj, GL_COMPILE);
|
||||
|
||||
glPushMatrix();
|
||||
glTranslatef(0.0, 0.0, -0.5 * height);
|
||||
|
||||
/* cylinder */
|
||||
gluQuadricNormals(q, GL_SMOOTH);
|
||||
gluQuadricTexture(q, GL_TRUE);
|
||||
gluCylinder(q, radius, radius, height, 24, 10);
|
||||
|
||||
/* end cap */
|
||||
glTranslatef(0.0, 0.0, height);
|
||||
gluDisk(q, 0.0, radius, 24, 1);
|
||||
|
||||
/* other end cap */
|
||||
glTranslatef(0.0, 0.0, -height);
|
||||
gluQuadricOrientation(q, GLU_INSIDE);
|
||||
gluDisk(q, 0.0, radius, 24, 1);
|
||||
|
||||
glPopMatrix();
|
||||
glEndList();
|
||||
gluDeleteQuadric(q);
|
||||
}
|
||||
|
||||
/* Teapot */
|
||||
{
|
||||
TeapotObj = glGenLists(1);
|
||||
glNewList(TeapotObj, GL_COMPILE);
|
||||
|
||||
glFrontFace(GL_CW);
|
||||
glutSolidTeapot(40.0);
|
||||
glFrontFace(GL_CCW);
|
||||
|
||||
glEndList();
|
||||
}
|
||||
|
||||
/* show cylinder by default */
|
||||
Object = CylinderObj;
|
||||
|
||||
|
||||
/* lighting */
|
||||
glEnable(GL_LIGHTING);
|
||||
{
|
||||
GLfloat pos[4] = { 3, 3, 3, 1 };
|
||||
glLightfv(GL_LIGHT0, GL_AMBIENT, Black);
|
||||
glLightfv(GL_LIGHT0, GL_DIFFUSE, White);
|
||||
glLightfv(GL_LIGHT0, GL_SPECULAR, White);
|
||||
glLightfv(GL_LIGHT0, GL_POSITION, pos);
|
||||
glEnable(GL_LIGHT0);
|
||||
glMaterialfv(GL_FRONT, GL_AMBIENT, Black);
|
||||
glMaterialf(GL_FRONT, GL_SHININESS, Shininess);
|
||||
glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
|
||||
}
|
||||
|
||||
/* Base texture */
|
||||
glGenTextures(1, &BaseTexture);
|
||||
glBindTexture(GL_TEXTURE_2D, BaseTexture);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
if (!LoadRGBMipmaps(BASE_TEXTURE_FILE, GL_RGB)) {
|
||||
printf("Error: couldn't load texture image file %s\n", BASE_TEXTURE_FILE);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* Specular texture */
|
||||
glGenTextures(1, &SpecularTexture);
|
||||
glBindTexture(GL_TEXTURE_2D, SpecularTexture);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
|
||||
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
|
||||
if (!LoadRGBMipmaps(SPECULAR_TEXTURE_FILE, GL_RGB)) {
|
||||
printf("Error: couldn't load texture image file %s\n", SPECULAR_TEXTURE_FILE);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* misc */
|
||||
glEnable(GL_CULL_FACE);
|
||||
glEnable(GL_TEXTURE_2D);
|
||||
glEnable(GL_DEPTH_TEST);
|
||||
glEnable(GL_NORMALIZE);
|
||||
|
||||
if (argc > 1 && strcmp(argv[1], "-info")==0) {
|
||||
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
||||
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
|
||||
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
|
||||
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int main( int argc, char *argv[] )
|
||||
{
|
||||
glutInit( &argc, argv );
|
||||
glutInitWindowSize( 500, 500 );
|
||||
|
||||
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
|
||||
|
||||
glutCreateWindow(argv[0] );
|
||||
|
||||
Init(argc, argv);
|
||||
|
||||
glutReshapeFunc( Reshape );
|
||||
glutKeyboardFunc( Key );
|
||||
glutSpecialFunc( SpecialKey );
|
||||
glutDisplayFunc( Display );
|
||||
glutIdleFunc( Idle );
|
||||
|
||||
glutCreateMenu(ModeMenu);
|
||||
glutAddMenuEntry("Toggle Highlight", DO_SPEC_TEXTURE);
|
||||
glutAddMenuEntry("Toggle Object", OBJECT);
|
||||
glutAddMenuEntry("Toggle Animate", ANIMATE);
|
||||
glutAddMenuEntry("Quit", QUIT);
|
||||
glutAttachMenu(GLUT_RIGHT_BUTTON);
|
||||
|
||||
glutMainLoop();
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue