Another problem

[forfan]

My os is debian3.1.
The following code is made from Redbook example:
I have no idea what is wrong with the code, it just
showed a black window in my computer.
Where is the problem?

thx in advance.



#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>

static GLubyte frontIndices[] = {4,5,6,7};
static GLubyte rightIndices[] = {1,2,6,5};
static GLubyte bottomIndices[] = {0,1,5,4};
static GLubyte backIndices[] = {0,3,2,1};
static GLubyte leftIndices[] = {0,4,7,3};
static GLubyte topIndices[] = {2,3,7,6};

void Init()
{
glClearColor(0.0,0.0,0.0,0.0);
glShadeModel(GL_FLAT);
}

void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,1.0,1.0);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(4,GL_INT,0,frontIndices);
glVertexPointer(4,GL_INT,0,rightIndices);
glVertexPointer(4,GL_INT,0,bottomIndices);
glVertexPointer(4,GL_INT,0,backIndices);
glVertexPointer(4,GL_INT,0,leftIndices);
glVertexPointer(4,GL_INT,0,topIndices);

glDrawElements(GL_QUADS,4,GL_UNSIGNED_BYTE,frontIn dices);
glDrawElements(GL_QUADS,4,GL_UNSIGNED_BYTE,rightIn dices);
glDrawElements(GL_QUADS,4,GL_UNSIGNED_BYTE,bottomI ndices);
glDrawElements(GL_QUADS,4,GL_UNSIGNED_BYTE,backInd ices);
glDrawElements(GL_QUADS,4,GL_UNSIGNED_BYTE,leftInd ices);
glDrawElements(GL_QUADS,4,GL_UNSIGNED_BYTE,topIndi ces);


glutSwapBuffers();
}

void reshape(int w, int h)
{
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0,5.0,0.0,5.0,0.0,5.0);
}

int main(int argc,char** argv)
{
glutInit(&amp;argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutInitWindowSize(400,400);
glutInitWindowPosition(100,100);
glutCreateWindow("Example2-11");
Init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
return 0;
}

[RigidBody]

you need 2 things:

1. an array of vertices, by which the geometry is defined.

2. an array of indices, which defines the order in which the vertices are drawn.

in the following example, vertices[] defines the corner nodes of a cube.

the faces of the cube are defined by the index arrays.

be sure to enable GL_DEPTH_TEST, otherwise the result might look strange.


GLfloat vertices[] = {
-1., -1., -1., // NODE 0
1., -1., -1., // NODE 1
1., 1., -1., // NODE 2
-1., 1., -1., // NODE 3
-1., -1., 1., // NODE 4
1., -1., 1., // NODE 5
1., 1., 1., // NODE 6
-1., 1., 1. }; // NODE 7

GLubyte frontIndices[] = { 4,5,6,7 }; // FACE 1 : NODES 4, 5, 6, 7
GLubyte rightIndices[] = { 1,2,6,5 }; // FACE 2
GLubyte bottomIndices[] = { 0,1,5,4 }; // FACE 3
GLubyte backIndices[] = { 0,3,2,1 }; // FACE 4
GLubyte leftIndices[] = { 0,4,7,3 }; // FACE 5
GLubyte topIndices[] = { 2,3,7,6 }; // FACE 6

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-2., 2., -2., 2., 1., 100.);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(15., 10., 10., 0., 0., 0., 0., 0., 1.);

glEnable(GL_DEPTH_TEST);

glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, vertices);

glColor3f(1.0, 0.0, 0.0); glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, frontIndices);
glColor3f(1.0, 1.0, 0.0); glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, backIndices);
glColor3f(0.0, 1.0, 0.0); glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, leftIndices);
glColor3f(0.0, 1.0, 1.0); glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, rightIndices);
glColor3f(1.0, 0.0, 1.0); glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, topIndices);
glColor3f(1.0, 1.0, 1.0); glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, bottomIndices);

[forfan]

Thx so much!
I got the program work according to your advise.