Textures Screwing Up

[Krak]

I'm trying to make a bit of a background scene in OpenGL. The first rectangle is the ground rectangle with a grass texture, and the second is a rectangle placed behind it, which is supposed to be the sky.

The code compiles just fine, but when I run it, I get unexpected results. The texture in front disappears, and the texture behind it doesn't even show up.

When I remove the second rectangle, the first one shows up just fine, texture and all. But adding the second rectangle screws everything up.

//Ground Rectangle{
glTexCoord2f(0.0f,0.0f);
glVertex3f(-9.0f,0.0f,0.0f);	//Bottom Left
glTexCoord2f(1.0f,0.0f);
glVertex3f(9.0f,0.0f,0.0f);	//Bottom Right
glTexCoord2f(1.0f,1.0f);
glVertex3f(9.0f,9.0f,0.0f);	//Top Right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-9.0f,9.0f,0.0f);	//Top Left
//}

//Sky Rectangle{
glColor3f(0.1f,0.2f,1.1f);	//Blue-ish Sky
glTranslatef(0.0f,0.0f,-1.0f);	//Placed Behind Ground
glVertex3f(-9.0f,0.0f,0.0f);	//Bottom Left
glVertex3f(9.0f,0.0f,0.0f);	//Bottom Right
glVertex3f(9.0f,9.0f,0.0f);	//Top Right
glVertex3f(-9.0f,9.0f,0.0f);	//Top Left
//}

I really have no idea how to make different layers of textured polygons work, nor do I know how to add more than one texture my program. Can anyone help?

[frenchfry164]

When you are in texture mode everything needs a texture (from my experiences, I'm new at OpenGL as well). So you need to make a texture for the sky. A good way to do this if you only want one color is to just make a 1D texture with one pixel that is the color you want, and bind it to the sky.

edit: Oh, and to make the ground on the bottom of the screen like real life, you need to tip your quad over.

edit 2: The easiest way to do a sky if it is one color is to set the clear color to blue. Than just render all your polygons, and it'll look right.

[Krak]

Ok, the following is the code for textures.h, which has my LoadGLTextures() function.
Please bear with me, because I really don't have much of an idea how to do this right at all:

AUX_RGBImageRec *LoadBMP(char *Filename);

int LoadGLTextures() // Load Bitmaps And Convert To Textures
{
int Status=FALSE; // Status Indicator, Nothing's Happened Yet.
AUX_RGBImageRec *TextureImage[2]; // Create Storage Space For The Texture
memset(TextureImage,0,sizeof(void *)*1); // Set The Pointer To NULL, Clear Image Record


// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit
if (TextureImage[0]=LoadBMP("C:/Documents and Settings/Dean/My Documents/My Pictures/gamesprites/tilegrass.bmp"))
{
Status=TRUE; // Set The Status To TRUE

glGenTextures(1, &texture[0]); // Create The Texture

// Typical Texture Generation Using Data From The Bitmap
glBindTexture(GL_TEXTURE_2D, texture[0]);

// Generate The Texture
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // Linear Filtering
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // Linear Filtering
}

if (TextureImage[0]) // If Texture Exists
{
if (TextureImage[0]->data) // If Texture Image Exists
{
free(TextureImage[0]->data); // Free The Texture Image Memory
}

free(TextureImage[0]); // Free The Image Structure
}

if (TextureImage[1]=LoadBMP("C:/Documents and Settings/Dean/My Documents/My Pictures/gamesprites/s1.bmp"))
{
Status=TRUE; // Set The Status To TRUE

glGenTextures(1, &texture[1]); // Create The Texture

// Typical Texture Generation Using Data From The Bitmap
glBindTexture(GL_TEXTURE_2D, texture[1]);

// Generate The Texture
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[1]->sizeX, TextureImage[1]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[1]->data);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // Linear Filtering
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // Linear Filtering
}

if (TextureImage[1]) // If Texture Exists
{
if (TextureImage[1]->data) // If Texture Image Exists
{
free(TextureImage[1]->data); // Free The Texture Image Memory
}

free(TextureImage[1]); // Free The Image Structure
}
return Status; // Return The Status
}

...and this is the code for my function that draws polygons:

glLoadIdentity();
glTranslatef(0.0f,-12.0f,-15.0f);

glBegin(GL_QUADS);

glBindTexture(GL_TEXTURE_2D, texture[0]);
//Ground Rectangle{
glTexCoord2f(0.0f,0.0f);
glVertex3f(-9.0f,0.0f,0.0f); //Bottom Left
glTexCoord2f(1.0f,0.0f);
glVertex3f(9.0f,0.0f,0.0f); //Bottom Right
glTexCoord2f(1.0f,1.0f);
glVertex3f(9.0f,9.0f,0.0f); //Top Right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-9.0f,9.0f,0.0f); //Top Left
//}

glTranslatef(0.0f,9.0f,-1.0f);
glBindTexture(GL_TEXTURE_2D, texture[1]);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-11.0f,0.0f,0.0f); //Bottom Left
glTexCoord2f(1.0f,0.0f);
glVertex3f(11.0f,0.0f,0.0f); //Bottom Right
glTexCoord2f(1.0f,1.0f);
glVertex3f(11.0f,9.0f,0.0f); //Top Right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-11.0f,9.0f,0.0f); //Top Left

I want there to be a rectangle on top, with "s1.bmp", and one below with "tilegrass.bmp".
Only one rectangle shows up, though: the one that "tilegrass.bmp" is supposed to be on,
but instead of that, "s1.bmp" is on it.

I really need some help with this stuff. :\