Texturing - Praise for OpenGL ES 30 Programming Guide - page 258

Example of Using a Cubemap Texture

Using a cubemap texture is very similar to using a 2D texture. The example
Simple_TextureCubemap demonstrates drawing a sphere with a simple
cubemap. The cubemap contains six 1 × 1 faces, each with a different
color. The code in Example 9-4 is used to load the cubemap texture.

Example 9-4 Loading a Cubemap Texture

GLuint CreateSimpleTextureCubemap()
{
GLuint textureId;
// Six l x l RGB faces
GLubyte cubePixels[6][3] =
{
// Face 0 - Red
255, 0, 0,
// Face 1 - Green,
0, 255, 0,
// Face 2 - Blue
0, 0, 255,
// Face 3 - Yellow
255, 255, 0,
// Face 4 - Purple
255, 0, 255,
// Face 5 - White
255, 255, 255
};

// Generate a texture object
glGenTextures(1, &textureId);

// Bind the texture object
glBindTexture(GL_TEXTURE_CUBE_MAP, textureId);

// Load the cube face - Positive X
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB, 1, 1,
0, GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[0]);

// Load the cube face - Negative X
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB, 1, 1,
0, GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[1]);

// Load the cube face - Positive Y
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGB, 1, 1,
0, GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[2]);

// Load the cube face - Negative Y
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGB, 1, 1,
0, GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[3]);