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| -rw-r--r-- | progs/demos/gloss.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/progs/demos/gloss.c b/progs/demos/gloss.c new file mode 100644 index 0000000000..5de3647d62 --- /dev/null +++ b/progs/demos/gloss.c @@ -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; +} |