2 textures(diferent coords) in one polygon

How do I render 2 textures with diferent coords in one polygon?

example:

1 very large texture for a terrain, whe I get closer, render the large terrain and a small texture to make the ground more realistic.

256x256 tile (quad)
256x256 texture covering all the quad
256x256 texture repeating X times to make a more detailed terrain

I was reading about ARB extension in nehe, but its not a good tutorial about this subject.

sorry for bad english.

Hi,

Use multitexturing.

Here’s a example :

// 1. Première unité de texture
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_2D, Texture_BMP[0]);
glEnable(GL_TEXTURE_2D);

// 2. Deuxième unité de texture
glActiveTextureARB(GL_TEXTURE1_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
/*
	GL_MODULATE		==> Mélange les 2 textures
	GL_REPLACE		==> Remplace la texture existante
*/
glBindTexture(GL_TEXTURE_2D, Texture_BMP[1]);
glEnable(GL_TEXTURE_2D);
	
glBegin(GL_QUADS);
	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0f, 1.0f);	// Coord. 1ère texture
	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0f, 1.0f); 	// Coord. 2ème texture
	glVertex3f( 0.75f,  0.75f, 0);	// Coin supérieur droit

	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0f, 0.0f); 	// Coord. 1ère texture
	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0f, 0.0f); 	// Coord. 2ème texture 
	glVertex3f( 0.75f, -0.75f, 0);	// Coin inférieur droit

	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0f, 0.0f); 	// Coord. 1ère texture
	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0f, 0.0f); 	// Coord. 2ème texture
	glVertex3f(-0.75f, -0.75f, 0);	// Coin inférieur gauche

	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0f, 1.0f); 	// Coord. 1ère texture
	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0f, 1.0f); 	// Coord. 2ème texture
	glVertex3f(-0.75f,  0.75f, 0);	// Coin supérieur gauche
glEnd();