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_steinha...@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...
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