-
/*
* Demo of a reflective, texture-mapped surface with OpenGL.
* Brian Paul August 14, 1995 This file is in the public domain.
* Dirk Reiners (reiners@igd.fhg.de) made some modifications to this code.
* Mark Kilgard (April 1997)
* Brian Paul (April 2000 - added keyboard d/s options)
+ * Brian Paul (August 2005 - added multi window feature)
*/
+#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#define DEG2RAD (3.14159/180.0)
-
#define TABLE_TEXTURE "../images/tile.rgb"
+#define MAX_OBJECTS 2
+#define INIT_WIDTH 400
+#define INIT_HEIGHT 300
-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];
+struct window {
+ int id; /* returned by glutCreateWindow() */
+ int width, height;
+ GLboolean anim;
+ GLfloat xrot, yrot;
+ GLfloat spin;
+ GLenum showBuffer;
+ GLuint table_list;
+ GLuint objects_list[MAX_OBJECTS];
+ double t0;
+ struct window *next;
+};
+
+
+static struct window *FirstWindow = NULL;
+
+
+static void
+CreateWindow(void);
+
+
+static struct window *
+CurrentWindow(void)
+{
+ int id = glutGetWindow();
+ struct window *w;
+ for (w = FirstWindow; w; w = w->next) {
+ if (w->id == id)
+ return w;
+ }
+ return NULL;
+}
+
+
+static GLboolean
+AnyAnimating(void)
+{
+ struct window *w;
+ for (w = FirstWindow; w; w = w->next) {
+ if (w->anim)
+ return 1;
+ }
+ return 0;
+}
+
-static GLfloat xrot, yrot;
-static GLfloat spin;
+static void
+KillWindow(struct window *w)
+{
+ struct window *win, *prev = NULL;
+ for (win = FirstWindow; win; win = win->next) {
+ if (win == w) {
+ if (prev) {
+ prev->next = win->next;
+ }
+ else {
+ FirstWindow = win->next;
+ }
+ glutDestroyWindow(win->id);
+ win->next = NULL;
+ free(win);
+ return;
+ }
+ prev = win;
+ }
+}
-static GLint Width = 400, Height = 300;
-static GLenum ShowBuffer = GL_NONE;
-static GLboolean Anim = GL_TRUE;
-/* performance info */
-static GLint T0 = 0;
-static GLint Frames = 0;
+static void
+KillAllWindows(void)
+{
+ while (FirstWindow)
+ KillWindow(FirstWindow);
+}
-static void make_table( void )
+static GLuint
+MakeTable(void)
{
static GLfloat table_mat[] = { 1.0, 1.0, 1.0, 0.6 };
static GLfloat gray[] = { 0.4, 0.4, 0.4, 1.0 };
+ GLuint table_list;
table_list = glGenLists(1);
glNewList( table_list, GL_COMPILE );
/* load table's texture */
glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, table_mat );
-/* glMaterialfv( GL_FRONT, GL_EMISSION, gray );*/
+ /*glMaterialfv( GL_FRONT, GL_EMISSION, gray );*/
glMaterialfv( GL_FRONT, GL_DIFFUSE, table_mat );
glMaterialfv( GL_FRONT, GL_AMBIENT, gray );
glDisable( GL_TEXTURE_2D );
glEndList();
+ return table_list;
}
-static void make_objects( void )
+static void
+MakeObjects(GLuint *objects_list)
{
GLUquadricObj *q;
}
-static void init( void )
+static void
+InitWindow(struct window *w)
{
- make_table();
- make_objects();
+ GLint imgWidth, imgHeight;
+ GLenum imgFormat;
+ GLubyte *image = NULL;
- Image = LoadRGBImage( TABLE_TEXTURE, &ImgWidth, &ImgHeight, &ImgFormat );
- if (!Image) {
+ w->table_list = MakeTable();
+ MakeObjects(w->objects_list);
+
+ image = LoadRGBImage( TABLE_TEXTURE, &imgWidth, &imgHeight, &imgFormat );
+ if (!image) {
printf("Couldn't read %s\n", TABLE_TEXTURE);
exit(0);
}
- gluBuild2DMipmaps(GL_TEXTURE_2D, 3, ImgWidth, ImgHeight,
- ImgFormat, GL_UNSIGNED_BYTE, Image);
+ gluBuild2DMipmaps(GL_TEXTURE_2D, 3, imgWidth, imgHeight,
+ imgFormat, GL_UNSIGNED_BYTE, image);
+ free(image);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
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 );
- xrot = 30.0;
- yrot = 50.0;
- spin = 0.0;
-
glShadeModel( GL_FLAT );
glEnable( GL_LIGHT0 );
}
-
-static void reshape(int w, int h)
+static void
+Reshape(int width, int height)
{
+ struct window *w = CurrentWindow();
GLfloat yAspect = 2.5;
- GLfloat xAspect = yAspect * (float) w / (float) h;
- Width = w;
- Height = h;
- glViewport(0, 0, w, h);
+ GLfloat xAspect = yAspect * (float) width / (float) height;
+ w->width = width;
+ w->height = height;
+ glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum( -xAspect, xAspect, -yAspect, yAspect, 10.0, 30.0 );
}
-
-static void draw_objects( GLfloat eyex, GLfloat eyey, GLfloat eyez )
+static void
+DrawObjects(struct window *w, GLfloat eyex, GLfloat eyey, GLfloat eyez)
{
(void) eyex;
(void) eyey;
#ifndef USE_ZBUFFER
if (eyex<0.5) {
#endif
- glPushMatrix();
- glTranslatef( 1.0, 1.5, 0.0 );
- glRotatef( spin, 1.0, 0.5, 0.0 );
- glRotatef( 0.5*spin, 0.0, 0.5, 1.0 );
- glCallList( objects_list[0] );
- glPopMatrix();
-
- 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 );
- glRotatef( spin, 1.0, 0.5, 0.0 );
- glScalef( 0.5, 0.5, 0.5 );
- glCallList( objects_list[1] );
- glPopMatrix();
+ glPushMatrix();
+ glTranslatef( 1.0, 1.5, 0.0 );
+ glRotatef( w->spin, 1.0, 0.5, 0.0 );
+ glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+ glCallList( w->objects_list[0] );
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*w->spin) ), 0.0 );
+ glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+ glRotatef( w->spin, 1.0, 0.5, 0.0 );
+ glScalef( 0.5, 0.5, 0.5 );
+ glCallList( w->objects_list[1] );
+ glPopMatrix();
#ifndef USE_ZBUFFER
}
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 );
- glRotatef( spin, 1.0, 0.5, 0.0 );
- glScalef( 0.5, 0.5, 0.5 );
- glCallList( objects_list[1] );
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef( 1.0, 1.5, 0.0 );
- glRotatef( spin, 1.0, 0.5, 0.0 );
- glRotatef( 0.5*spin, 0.0, 0.5, 1.0 );
- glCallList( objects_list[0] );
- glPopMatrix();
+ glPushMatrix();
+ glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*w->spin) ), 0.0 );
+ glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+ glRotatef( w->spin, 1.0, 0.5, 0.0 );
+ glScalef( 0.5, 0.5, 0.5 );
+ glCallList( w->objects_list[1] );
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef( 1.0, 1.5, 0.0 );
+ glRotatef( w->spin, 1.0, 0.5, 0.0 );
+ glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+ glCallList( w->objects_list[0] );
+ glPopMatrix();
}
#endif
}
-
-static void draw_table( void )
+static void
+DrawTable(struct window *w)
{
- glCallList( table_list );
+ glCallList(w->table_list);
}
-
-static void draw_scene( void )
+static void
+DrawWindow(void)
{
+ struct window *w = CurrentWindow();
static GLfloat light_pos[] = { 0.0, 20.0, 0.0, 1.0 };
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);
+ eyex = dist * cos(w->yrot * DEG2RAD) * cos(w->xrot * DEG2RAD);
+ eyez = dist * sin(w->yrot * DEG2RAD) * cos(w->xrot * DEG2RAD);
+ eyey = dist * sin(w->xrot * DEG2RAD);
/* view from top */
glPushMatrix();
glStencilFunc( GL_ALWAYS, 1, 0xffffffff );
glStencilOp( GL_REPLACE, GL_REPLACE, GL_REPLACE );
glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
- draw_table();
+ DrawTable(w);
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
glEnable( GL_DEPTH_TEST );
/* Reposition light in reflected space. */
glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
- draw_objects(eyex, eyey, eyez);
+ DrawObjects(w, eyex, eyey, eyez);
glPopMatrix();
/* Restore light's original unreflected position. */
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
glEnable( GL_TEXTURE_2D );
- draw_table();
+ DrawTable(w);
glDisable( GL_TEXTURE_2D );
glDisable( GL_BLEND );
/* view from top */
glPushMatrix();
- draw_objects(eyex, eyey, eyez);
+ DrawObjects(w, eyex, eyey, eyez);
glPopMatrix();
glPopMatrix();
- if (ShowBuffer == GL_DEPTH) {
- ShowDepthBuffer(Width, Height, 1.0, 0.0);
+ if (w->showBuffer == GL_DEPTH) {
+ ShowDepthBuffer(w->width, w->height, 1.0, 0.0);
}
- else if (ShowBuffer == GL_STENCIL) {
- ShowStencilBuffer(Width, Height, 255.0, 0.0);
+ else if (w->showBuffer == GL_STENCIL) {
+ ShowStencilBuffer(w->width, w->height, 255.0, 0.0);
}
- else if (ShowBuffer == GL_ALPHA) {
- ShowAlphaBuffer(Width, Height);
+ else if (w->showBuffer == GL_ALPHA) {
+ ShowAlphaBuffer(w->width, w->height);
}
glutSwapBuffers();
+ /* calc/show frame rate */
{
+ static GLint t0 = 0;
+ static GLint frames = 0;
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;
+ 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 idle( void )
+static void
+Idle(void)
{
- static double t0 = -1.;
- double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
- if (t0 < 0.0)
- t0 = t;
- dt = t - t0;
- t0 = t;
- spin += 60.0 * dt;
- yrot += 90.0 * dt;
- glutPostRedisplay();
+ double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+ struct window *w;
+ for (w = FirstWindow; w; w = w->next) {
+ if (w->anim) {
+ double dt;
+ if (w->t0 < 0.0)
+ w->t0 = t;
+ dt = t - w->t0;
+ w->t0 = t;
+ w->spin += 60.0 * dt;
+ w->yrot += 90.0 * dt;
+ assert(w->id);
+ glutSetWindow(w->id);
+ glutPostRedisplay();
+ }
+ }
}
-static void Key( unsigned char key, int x, int y )
+static void
+Key(unsigned char key, int x, int y)
{
+ struct window *w = CurrentWindow();
(void) x;
(void) y;
- if (key == 'd') {
- ShowBuffer = GL_DEPTH;
- }
- else if (key == 's') {
- ShowBuffer = GL_STENCIL;
- }
- else if (key == 'a') {
- ShowBuffer = GL_ALPHA;
- }
- else if (key == ' ') {
- Anim = !Anim;
- if (Anim)
- glutIdleFunc(idle);
+
+ switch (key) {
+ case 'd':
+ w->showBuffer = GL_DEPTH;
+ glutPostRedisplay();
+ break;
+ case 's':
+ w->showBuffer = GL_STENCIL;
+ glutPostRedisplay();
+ break;
+ case 'a':
+ w->showBuffer = GL_ALPHA;
+ glutPostRedisplay();
+ break;
+ case 'c':
+ w->showBuffer = GL_NONE;
+ glutPostRedisplay();
+ break;
+ case ' ':
+ w->anim = !w->anim;
+ w->t0 = -1;
+ if (AnyAnimating())
+ glutIdleFunc(Idle);
else
glutIdleFunc(NULL);
- }
- else if (key==27) {
+ glutPostRedisplay();
+ break;
+ case 'n':
+ CreateWindow();
+ break;
+ case 'k':
+ KillWindow(w);
+ if (FirstWindow == NULL)
+ exit(0);
+ break;
+ case 27:
+ KillAllWindows();
exit(0);
+ break;
+ default:
+ ;
}
- else {
- ShowBuffer = GL_NONE;
- }
- glutPostRedisplay();
}
-static void SpecialKey( int key, int x, int y )
+static void
+SpecialKey(int key, int x, int y)
{
+ struct window *w = CurrentWindow();
(void) x;
(void) y;
switch (key) {
case GLUT_KEY_UP:
- xrot += 3.0;
- if ( xrot > 85 )
- xrot = 85;
+ w->xrot += 3.0;
+ if (w->xrot > 85)
+ w->xrot = 85;
break;
case GLUT_KEY_DOWN:
- xrot -= 3.0;
- if ( xrot < 5 )
- xrot = 5;
+ w->xrot -= 3.0;
+ if (w->xrot < 5)
+ w->xrot = 5;
break;
case GLUT_KEY_LEFT:
- yrot += 3.0;
+ w->yrot += 3.0;
break;
case GLUT_KEY_RIGHT:
- yrot -= 3.0;
+ w->yrot -= 3.0;
break;
}
glutPostRedisplay();
}
-int main( int argc, char *argv[] )
+static void
+CreateWindow(void)
{
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_STENCIL | GLUT_ALPHA);
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( Width, Height );
- glutCreateWindow(argv[0]);
- glutReshapeFunc(reshape);
- glutDisplayFunc(draw_scene);
+ char title[1000];
+ struct window *w = (struct window *) calloc(1, sizeof(struct window));
+
+ glutInitWindowSize(INIT_WIDTH, INIT_HEIGHT);
+ w->id = glutCreateWindow("foo");
+ sprintf(title, "reflect window %d", w->id);
+ glutSetWindowTitle(title);
+ assert(w->id);
+ w->width = INIT_WIDTH;
+ w->height = INIT_HEIGHT;
+ w->anim = GL_TRUE;
+ w->xrot = 30.0;
+ w->yrot = 50.0;
+ w->spin = 0.0;
+ w->showBuffer = GL_NONE;
+
+ InitWindow(w);
+
+ glutReshapeFunc(Reshape);
+ glutDisplayFunc(DrawWindow);
glutKeyboardFunc(Key);
glutSpecialFunc(SpecialKey);
- glutIdleFunc(idle);
- init();
+
+ /* insert at head of list */
+ w->next = FirstWindow;
+ FirstWindow = w;
+}
+
+
+static void
+Usage(void)
+{
+ printf("Keys:\n");
+ printf(" a - show alpha buffer\n");
+ printf(" d - show depth buffer\n");
+ printf(" s - show stencil buffer\n");
+ printf(" c - show color buffer\n");
+ printf(" n - create new window\n");
+ printf(" k - kill window\n");
+ printf(" SPACE - toggle animation\n");
+ printf(" ARROWS - rotate scene\n");
+}
+
+
+int
+main(int argc, char *argv[])
+{
+ glutInit(&argc, argv);
+ glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH |
+ GLUT_STENCIL | GLUT_ALPHA);
+ CreateWindow();
+ glutIdleFunc(Idle);
+ Usage();
glutMainLoop();
return 0;
}
projects / mesa.git / commitdiff