Hi Chus,
Chus Puras wrote:
> Hi all!
>
> I'm trying to load a png image with OpenSG and then use it for
> texture a Cube (i'm doing some testing...) in plain OpenGL. Can this
> be done?
> I have been looking for through the mailing list archives but i've
> not found the right answers :(
>
> Here is a snippet of my code:
>
> #define MAX_NO_TEXTURES 1
>
>
> #define CUBE_TEXTURE 0
>
>
> GLuint texture_id[MAX_NO_TEXTURES];
>
> void init(void){
> glEnable ( GL_TEXTURE_2D );
> glGenTextures (1, texture_id);
>
> ImagePtr im=Image::create();
> im->read("the_image.png");
>
> glBindTexture ( GL_TEXTURE_2D, texture_id[CUBE_TEXTURE] );
> glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, im->getWidth(),
> im->getHeight(), 0, GL_RGB, GL_UNSIGNED_BYTE, im->getData() );
> }
>
> This
> function is called after creating a glut window and all the opengl
> context. The display function is something similar to the next:
>
> void display( void )
> {
> glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
> glLoadIdentity ( );
> glPushMatrix();
> glTranslatef ( 0.0, 0.0, -5.0 );
>
> glBindTexture ( GL_TEXTURE_2D, texture_id[0] );
> glBegin ( GL_QUADS );
> // Front Face
> glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
> glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
> glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
> glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
> // Back Face
> glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
> glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
> glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
> glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
> // Top Face...
> // Bottom Face...
> // Right face...
> // Left Face ...
> glEnd();
> glPopMatrix();
> glutSwapBuffers();
> }
>
> What I'm doing wrong? What I'm getting is a white cube :(
>
> The original code is from the nehe's 6th tutorial (texture mapping)
> in the glut version.
> I'm compiling in Linux with the 1.8 version of OpenSG.
I can't find the glEnable(GL_TEXTURE_2D); anywhere. Without it texturing is not
enabled. Also, you're not setting your filters explicitly. I'm not sure, but
the
default might be mipmapped, which you don't create. Try to set the filter to
GL_NEAREST explicitly and see if that helps.
Yours
Dirk
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