OpenGL ES Texture Problems - Printable Version

Code:

- (void)drawView:(GLView*)view;

{

    

    static GLfloat        rquad;           

    

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    

    glLoadIdentity();

    glEnable(GL_TEXTURE_2D);

    glEnableClientState(GL_VERTEX_ARRAY);

    glTranslatef(0.0f,0.0f,-15.0f);

    glRotatef(rquad, 0.0f, 1.0f, 0.0f);    

    glVertexPointer(3, GL_FLOAT, 0, box1_vertices);

    glTexCoordPointer(2, GL_FLOAT, 0, box1_Texture);

    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    

    

        for(int i = 0; i < num_box1_indices; i += 3)

    { 

        

        glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_SHORT, &box1_indices[i]);

        

    }

    

    glDisableClientState(GL_VERTEX_ARRAY);

    glDisableClientState(GL_TEXTURE_COORD_ARRAY);

    glDisable(GL_TEXTURE_2D);



    

    static NSTimeInterval lastDrawTime;

    if (lastDrawTime)

    {

        NSTimeInterval timeSinceLastDraw = [NSDate timeIntervalSinceReferenceDate] - lastDrawTime;

                        

        rquad-=70 * timeSinceLastDraw;    

    }

    lastDrawTime = [NSDate timeIntervalSinceReferenceDate];

}



-(void)setupView:(GLView*)view

{    CGImageRef spriteImage;    

     size_t    width, height;

    CGContextRef spriteContext;

    GLubyte *spriteData;

    GLuint spriteTexture;    

    

    

    const GLfloat zNear = 0.1, 

    zFar = 100.0, 

    fieldOfView = 60.0; 

    GLfloat size; 

    

    glMatrixMode(GL_PROJECTION); 

    glEnable(GL_DEPTH_TEST); 

    size = zNear * tanf(DEGREES_TO_RADIANS(fieldOfView) / 2.0); 

    CGRect rect = view.bounds; 

    glFrustumf(-size, size, -size / (rect.size.width / rect.size.height), size / 

               (rect.size.width / rect.size.height), zNear, zFar); 

    glViewport(0, 0, rect.size.width, rect.size.height); 

    glMatrixMode(GL_MODELVIEW); 

    

    

    

    

    spriteImage = [UIImage imageNamed:@"box.bmp"].CGImage;

    

    width = CGImageGetWidth(spriteImage);

    height = CGImageGetHeight(spriteImage);



    

    if(spriteImage) {

    

        spriteData = (GLubyte *) malloc(width * height * 4);

 

        spriteContext = CGBitmapContextCreate(spriteData, width, height, 8, width * 4, CGImageGetColorSpace(spriteImage), kCGImageAlphaPremultipliedLast);

.

        CGContextDrawImage(spriteContext, CGRectMake(0.0, 0.0, (CGFloat)width, (CGFloat)height), spriteImage);



        CGContextRelease(spriteContext);

        

    

        glGenTextures(1, &spriteTexture);

        

        glBindTexture(GL_TEXTURE_2D, spriteTexture);



        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, spriteData);

        

        free(spriteData);

        



        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

        

        

        glEnable(GL_TEXTURE_2D);

    

        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);

    

        glEnable(GL_BLEND);

    }

    

    

    //glLoadIdentity(); 

    glClearColor(0.0f, 0.0f, 1.0f, 1.0f); 

}

Code:

#define box1_H 



const int num_box1_indices  = 36;

const int num_box1_vertices  = 8;









float box1_vertices  [] = {

     -3.2126,0.0000,1.1594,

     -3.2126,0.0000,-0.4348,

     -1.8116,0.0000,-0.4348,

     -1.8116,0.0000,1.1594,

     -3.2126,1.6425,1.1594,

     -1.8116,1.6425,1.1594,

     -1.8116,1.6425,-0.4348,

     -3.2126,1.6425,-0.4348,

 };











float box1_Texture[] = {

    1.0000,0.0000,

    1.0000,1.0000,

    0.0000,1.0000,

    0.0000,0.0000,

 };











short box1_indices [] = {

    0,1,2,

    2,3,0,

    4,5,6,

    6,7,4,

    0,3,5,

    5,4,0,

    3,2,6,

    6,5,3,

    2,1,7,

    7,6,2,

    1,0,4,

    4,7,1,

 };