Using textures

OpenGL
1

I am using the following code to use a texture on a quad and I am having no luck. Any suggestions would be greatly appreciated!! Thanks.

TexBits = LoadDIBitmap(“REDBRICK.bmp”, &TexInfo);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

glTexImage2D(GL_TEXTURE_2D, 0, 3, TexInfo->bmiHeader.biWidth,
TexInfo->bmiHeader.biHeight, 0, GL_BGR_EXT,
GL_UNSIGNED_BYTE, TexBits);

glEnable(GL_TEXTURE_2D);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glBegin(GL_QUADS);

 glTexCoord2f(0.0,0.0);
 glVertex2f(0.0,0.0);
 glTexCoord2f(0.0,1.0);
 glVertex2f(0.0, 1.0);
 glTexCoord2f(1.0,1.0);
 glVertex2f(1.0, 1.0);
 glTexCoord2f(1.0,0.0);
 glVertex2f(1.0, 0.0);

glEnd();

SwapBuffers(hdc);

2

needs to work like this:::

///do this once , do not do this every frame
glEnable(GL_TEXTURE_2D);

glGenTextures(1, &texture[0]); //handle to the texture
glBindTexture(GL_TEXTURE_2D, texture[0]); //must bind it so we are using it

TexBits = LoadDIBitmap(“REDBRICK.bmp”, &TexInfo);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

glTexImage2D(GL_TEXTURE_2D, 0, 3, TexInfo->bmiHeader.biWidth,
TexInfo->bmiHeader.biHeight, 0, GL_BGR_EXT,
GL_UNSIGNED_BYTE, TexBits);

glBindTexture(GL_TEXTURE_2D,0); //bind to nothing so we dont use it when we dont want to

DeleteObject(TexBits); //since the bitmap is on video ram, we dont need it

/// ok this is going to happen every frame

while(…){ //this stuff goes in our animation loop

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glBindTexture(GL_TEXTURE_2D, texture[0]); //must bind it so we are using it

glBegin(GL_QUADS);

glTexCoord2f(0.0,0.0);
glVertex2f(0.0,0.0);
glTexCoord2f(0.0,1.0);
glVertex2f(0.0, 1.0);
glTexCoord2f(1.0,1.0);
glVertex2f(1.0, 1.0);
glTexCoord2f(1.0,0.0);
glVertex2f(1.0, 0.0);
glEnd();

glBindTexture(GL_TEXTURE_2D,0); //bind to nothing so we dont use it when we dont want to

SwapBuffers(hdc);

} // end loop

3

ps:

make sure you make a call to glDeleteTextures(1, &texture[0]);

at the end of your opengl window so you dont have a memory leak
remeber, if you make something you also must free it up
goes fro drawing list, vertex buffer objects, bitmaps, etc etc

4

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