diff options
| -rw-r--r-- | progs/demos/reflect.c | 158 |
1 files changed, 47 insertions, 111 deletions
diff --git a/progs/demos/reflect.c b/progs/demos/reflect.c index d941a73c607..8ddb9726b15 100644 --- a/progs/demos/reflect.c +++ b/progs/demos/reflect.c @@ -1,4 +1,4 @@ -/* $Id: reflect.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ +/* $Id: reflect.c,v 1.2 2000/04/12 01:08:30 brianp Exp $ */ /* * Demo of a reflective, texture-mapped surface with OpenGL. @@ -20,70 +20,40 @@ */ /* - * Dirk Reiners ([email protected]) made some modifications to this code. - * - * August 1996 - A few optimizations by Brian + * Authors: + * Brian Paul + * Dirk Reiners ([email protected]) made some modifications to this code. + * Mark Kilgard (April 1997) + * Brian Paul (April 2000 - added keyboard d/s options) */ -/* - * April, 1997 - Added Mark Kilgard's changes. - */ - -/* - * $Log: reflect.c,v $ - * Revision 1.1 1999/08/19 00:55:40 jtg - * Initial revision - * - * Revision 3.4 1999/03/28 18:22:05 brianp - * minor clean-up - * - * Revision 3.3 1998/11/22 02:54:29 brianp - * only draw one stack for gluCylinders - * - * Revision 3.2 1998/11/19 02:53:48 brianp - * changed texture image and background color - * - * Revision 3.1 1998/11/05 04:34:04 brianp - * moved image files to ../images/ directory - * - * Revision 3.0 1998/02/14 18:42:29 brianp - * initial rev - * - */ - - -#define USE_ZBUFFER - - -/* OK, without hardware support this is overkill. */ -#define USE_TEXTURE #include <math.h> #include <stdio.h> #include <stdlib.h> #include "GL/glut.h" - -#include "../util/readtex.c" /* a hack, I know */ +#include "../util/showbuffer.c" +#include "../util/readtex.c" #define DEG2RAD (3.14159/180.0) - #define TABLE_TEXTURE "../images/tile.rgb" -static int ImgWidth, ImgHeight; +static GLint ImgWidth, ImgHeight; static GLenum ImgFormat; static GLubyte *Image = NULL; #define MAX_OBJECTS 2 - static GLint table_list; static GLint objects_list[MAX_OBJECTS]; - static GLfloat xrot, yrot; static GLfloat spin; +static GLint Width = 400, Height = 300; +static GLenum ShowBuffer = GL_NONE; + static void make_table( void ) @@ -146,16 +116,11 @@ static void make_objects( void ) } -static GLfloat light_pos[] = { 0.0, 20.0, 0.0, 1.0 }; - static void init( void ) { make_table(); make_objects(); - /* Setup texture */ -#ifdef USE_TEXTURE - Image = LoadRGBImage( TABLE_TEXTURE, &ImgWidth, &ImgHeight, &ImgFormat ); if (!Image) { printf("Couldn't read %s\n", TABLE_TEXTURE); @@ -169,17 +134,11 @@ static void init( void ) glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); -#endif - xrot = 30.0; yrot = 50.0; spin = 0.0; -#ifndef USE_ZBUFFER - glEnable( GL_CULL_FACE ); -#endif - glShadeModel( GL_FLAT ); glEnable( GL_LIGHT0 ); @@ -194,12 +153,14 @@ static void init( void ) static void reshape(int w, int h) { - GLfloat aspect = (float) w / (float) h; - + GLfloat yAspect = 2.5; + GLfloat xAspect = yAspect * (float) w / (float) h; + Width = w; + Height = h; glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); - glFrustum( -aspect, aspect, -1.0, 1.0, 4.0, 300.0 ); + glFrustum( -xAspect, xAspect, -yAspect, yAspect, 10.0, 30.0 ); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } @@ -212,8 +173,7 @@ static void draw_objects( GLfloat eyex, GLfloat eyey, GLfloat eyez ) (void) eyey; (void) eyez; #ifndef USE_ZBUFFER - if (eyex<0.5) - { + if (eyex<0.5) { #endif glPushMatrix(); glTranslatef( 1.0, 1.5, 0.0 ); @@ -230,9 +190,8 @@ static void draw_objects( GLfloat eyex, GLfloat eyey, GLfloat eyez ) glCallList( objects_list[1] ); glPopMatrix(); #ifndef USE_ZBUFFER - } - else - { + } + else { glPushMatrix(); glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*spin) ), 0.0 ); glRotatef( 0.5*spin, 0.0, 0.5, 1.0 ); @@ -247,7 +206,7 @@ static void draw_objects( GLfloat eyex, GLfloat eyey, GLfloat eyez ) glRotatef( 0.5*spin, 0.0, 0.5, 1.0 ); glCallList( objects_list[0] ); glPopMatrix(); - } + } #endif } @@ -262,6 +221,7 @@ static void draw_table( void ) static void draw_scene( void ) { + static GLfloat light_pos[] = { 0.0, 20.0, 0.0, 1.0 }; GLfloat dist = 20.0; GLfloat eyex, eyey, eyez; @@ -279,20 +239,15 @@ static void draw_scene( void ) glLightfv( GL_LIGHT0, GL_POSITION, light_pos ); /* draw table into stencil planes */ - glEnable( GL_STENCIL_TEST ); -#ifdef USE_ZBUFFER glDisable( GL_DEPTH_TEST ); -#endif + glEnable( GL_STENCIL_TEST ); glStencilFunc( GL_ALWAYS, 1, 0xffffffff ); glStencilOp( GL_REPLACE, GL_REPLACE, GL_REPLACE ); glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE ); draw_table(); glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE ); -#ifdef USE_ZBUFFER glEnable( GL_DEPTH_TEST ); -#endif - /* render view from below (reflected viewport) */ /* only draw where stencil==1 */ @@ -318,9 +273,7 @@ static void draw_scene( void ) glEnable( GL_BLEND ); glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ); -#ifdef USE_TEXTURE glEnable( GL_TEXTURE_2D ); -#endif draw_table(); glDisable( GL_TEXTURE_2D ); glDisable( GL_BLEND ); @@ -334,43 +287,34 @@ static void draw_scene( void ) glPopMatrix(); - glutSwapBuffers(); -} - - - -#if 0 -void draw_scene(void) -{ - GLfloat dist = 20.0; - GLfloat eyex, eyey, eyez; - - glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); - - - eyex = dist * cos(yrot*DEG2RAD) * cos(xrot*DEG2RAD); - eyez = dist * sin(yrot*DEG2RAD) * cos(xrot*DEG2RAD); - eyey = dist * sin(xrot*DEG2RAD); - - /* view from top */ - glPushMatrix(); - gluLookAt( eyex, eyey, eyez, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0 ); - - draw_table(); - - glPopMatrix(); + if (ShowBuffer == GL_DEPTH) { + ShowDepthBuffer(Width, Height, 1.0, 0.0); + } + else if (ShowBuffer == GL_STENCIL) { + ShowStencilBuffer(Width, Height, 255.0, 0.0); + } glutSwapBuffers(); } -#endif static void Key( unsigned char key, int x, int y ) { (void) x; (void) y; - if (key==27) + if (key == 'd') { + ShowBuffer = GL_DEPTH; + } + else if (key == 's') { + ShowBuffer = GL_STENCIL; + } + else if (key==27) { exit(0); + } + else { + ShowBuffer = GL_NONE; + } + glutPostRedisplay(); } @@ -381,15 +325,13 @@ static void SpecialKey( int key, int x, int y ) switch (key) { case GLUT_KEY_UP: xrot += 3.0; -#ifndef USE_ZBUFFER - if ( xrot > 180 ) xrot = 180; -#endif + if ( xrot > 85 ) + xrot = 85; break; case GLUT_KEY_DOWN: xrot -= 3.0; -#ifndef USE_ZBUFFER - if ( xrot < 0 ) xrot = 0; -#endif + if ( xrot < 5 ) + xrot = 5; break; case GLUT_KEY_LEFT: yrot += 3.0; @@ -414,22 +356,16 @@ static void idle( void ) int main( int argc, char *argv[] ) { - glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB -#ifdef USE_ZBUFFER - | GLUT_DEPTH -#endif - | GLUT_STENCIL); + glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_STENCIL); glutInitWindowPosition( 0, 0 ); - glutInitWindowSize(400, 300 ); + glutInitWindowSize( Width, Height ); glutCreateWindow(argv[0]); glutReshapeFunc(reshape); glutDisplayFunc(draw_scene); glutKeyboardFunc(Key); glutSpecialFunc(SpecialKey); glutIdleFunc(idle); - init(); - glutMainLoop(); return 0; } |