Re: [Vala] How to bitwise math and implement a jagged array in Vala?

[Thomas F Steinhauer <tom_steinhauer hotmail com>]

Hey everybody,

Thank you for the help, I finally got it to work.
Tom

On 07/03/2013 11:55 PM, Simon Kågedal Reimer wrote:
> Hi! Evan's makeCheckImage function creates a new array and passes it 
> to the caller as a return value. You need to store it in the variable 
> that is passed to glTexImage2D; right now you are indeed giving it an 
> empty (uninitialized) texture array. Change the call to:
>
> checkImage = makeCheckImage()
>
> /simon
>
> > Den 4 jul 2013 03.07, "Thomas F Steinhauer" 
> > <tom_steinhauer hotmail com <mailto:tom_steinhauer hotmail com>> skrev:
> >
> > Dear Evan,
> > I tried the code that you have listed, It worked but no texture 
> > showed up on the quads. They were empty.
> >
> > I have pasted the whole code here as I have it now in hopes that 
> > someone might be able to figure out what is going on or maybe if I 
> > did something wrong.
> >
> >
> >     /*
> >      * Texture: CheckerBoard-pattern texture
> >      */
> >
> >     const int checkImageWidth = 64;      // Texture image rows and
> >     columns
> >     const int checkImageHeight = 64;
> >     GLubyte [,,] checkImage; // Texture image data
> >     GLuint texName;
> >
> >     private static uint8[,,] makeCheckImage (int width = 64, int
> >     height = 64) {
> >
> >
> >     >   uint8[,,] check_image = new uint8[height,width,4];
> >     >
> >     >   for ( var i = 0 ; i < height ; i++ ) {...
> >
> >     void init()
> >     {
> >        glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
> >        glShadeModel(GL_FLAT);
> >        glEnable(GL_DEPTH_TEST);
> >
> >        makeCheckImage();
> >        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
> >
> >        glGenTextures(1, (GLuint[])texName);
> >        glBindTexture(GL_TEXTURE_2D, texName);
> >
> >        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_MAG_FILTER, GL_NEAREST);
> >        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
> >        glTexImage2D(GL_TEXTURE_2D, 0, (GLint)GL_RGBA,
> >     checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
> >     checkImage);
> >     }
> >
> >     void display()
> >     {
> >        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> >        glEnable(GL_TEXTURE_2D);
> >        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
> >        glBindTexture(GL_TEXTURE_2D, texName);
> >        glBegin(GL_QUADS);
> >        glTexCoord2f(0.0f, 0.0f); glVertex3f(-2.0f, -1.0f, 0.0f);
> >        glTexCoord2f(0.0f, 1.0f); glVertex3f(-2.0f, 1.0f, 0.0f);
> >        glTexCoord2f(1.0f, 1.0f); glVertex3f(0.0f, 1.0f, 0.0f);
> >        glTexCoord2f(1.0f, 0.0f); glVertex3f(0.0f, -1.0f, 0.0f);
> >
> >        glTexCoord2f(0.0f, 0.0f); glVertex3f(1.0f, -1.0f, 0.0f);
> >        glTexCoord2f(0.0f, 1.0f); glVertex3f(1.0f, 1.0f, 0.0f);
> >        glTexCoord2f(1.0f, 1.0f); glVertex3f(2.41421f, 1.0f, -1.41421f);
> >        glTexCoord2f(1.0f, 0.0f); glVertex3f(2.41421f, -1.0f, -1.41421f);
> >        glEnd();
> >        glFlush();
> >        glDisable(GL_TEXTURE_2D);
> >     }
> >
> >     void reshape(int w, int h)
> >     {
> >        glViewport(0, 0, (GLsizei) w, (GLsizei) h);
> >        glMatrixMode(GL_PROJECTION);
> >        glLoadIdentity();
> >        gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
> >        glMatrixMode(GL_MODELVIEW);
> >        glLoadIdentity();
> >        glTranslatef(0.0f, 0.0f, -3.6f);
> >     }
> >
> >     void keyboard (uchar key, int x, int y)
> >     {
> >        switch (key) {
> >           case 27:
> >              //exit(0);
> >              break;
> >           default:
> >              break;
> >        }
> >     }
> >
> >     void main(string[] args)
> >     {
> >        glutInit(ref args.length, args);
> >        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA | GLUT_DEPTH);
> >        glutInitWindowSize(250, 250);
> >        glutInitWindowPosition(100, 100);
> >        glutCreateWindow("checker");
> >        init();
> >        glutDisplayFunc(display);
> >        glutReshapeFunc(reshape);
> >        glutKeyboardFunc(keyboard);
> >        glutMainLoop();
> >     }
> >
> >
> > Thanks
> > Tom
> >
> > On 07/02/2013 07:02 PM, Evan Nemerson wrote:
> >
> > >
> > > On Tue, 2013-07-02 at 18:49 -0500, Thomas F Steinhauer wrote:
> > >>
> > >> I tried your code as you sug...