Manual de Apoio 2010

• GL TEXTURE CUBE MAP POSITIVE Z• GL TEXTURE CUBE MAP NEGATIVE ZAs constantes representam a direcção no ambiente real para a textura que estamos a carregar. Por exemplopara definirmos a textura para a direcção x positiva, poderiamos utilizar a função glTexImage2D da seguinteforma:TGAImage img = loadImage (" facex . tga ");glTexImage2D ( GL2 . GL_TEXTURE_CUBE_MAP_POSITIVE_X , 0,img . getGLFormat () , img . getWidth () , img . getHeight () , 0,GL_RGBA , GL_UNSIGNED_BYTE , img . getData ());O excerto de código em baixo pertence ao programa CubeMap.java, e ilustra a forma como as texturaspoderiam carregadas para o cube map:// Obter os identificadoresIntBuffer textures = IntBuffer . allocate ( NumTextures );gl. glGenTextures ( NumTextures , textures );// ...// Direccoes para as texuras do cuboList < String > textureNames = new ArrayList < String >();private static final int [] CubeDirection = {GL2 . GL_TEXTURE_CUBE_MAP_POSITIVE_X ,GL2 . GL_TEXTURE_CUBE_MAP_NEGATIVE_X ,GL2 . GL_TEXTURE_CUBE_MAP_POSITIVE_Y ,GL2 . GL_TEXTURE_CUBE_MAP_NEGATIVE_Y ,GL2 . GL_TEXTURE_CUBE_MAP_POSITIVE_Z ,GL2 . GL_TEXTURE_CUBE_MAP_NEGATIVE_Z};// ...// Texturas do Cube MaptextureNames . add (" cubemap / right . tga ");textureNames . add (" cubemap / left . tga ");textureNames . add (" cubemap /up.tga ");textureNames . add (" cubemap / down . tga ");textureNames . add (" cubemap / backward . tga ");textureNames . add (" cubemap / forward . tga ");// ...// Carregar as texturas do Cubogl. glBindTexture ( GL2 . GL_TEXTURE_CUBE_MAP , textures . get ( CubeStartIndex ));// Parametros das texturas do cube mapgl. glTexParameteri ( GL2 . GL_TEXTURE_CUBE_MAP , GL2 . GL_TEXTURE_MAG_FILTER ,GL2 . GL_LINEAR );gl. glTexParameteri ( GL2 . GL_TEXTURE_CUBE_MAP , GL2 . GL_TEXTURE_MIN_FILTER ,GL2 . GL_LINEAR );gl. glTexParameteri ( GL2 . GL_TEXTURE_CUBE_MAP , GL2 . GL_TEXTURE_WRAP_S , GL2 . GL_REPEAT );gl. glTexParameteri ( GL2 . GL_TEXTURE_CUBE_MAP , GL2 . GL_TEXTURE_WRAP_T , GL2 . GL_REPEAT );gl. glTexParameteri ( GL2 . GL_TEXTURE_CUBE_MAP , GL2 . GL_TEXTURE_WRAP_R , GL2 . GL_REPEAT );// Restantes texturas preenchem o cubofor ( int i = CubeStartIndex ; i < textureNames . size (); i ++) {// Carregar e Ler a imagem para a nossa texturaTGAImage img = loadTexture ( textureNames . get (i ));ByteBuffer bb = img . getData ();}gl. glTexImage2D ( CubeDirection [i - CubeStartIndex ], 0, GL2 . GL_RGBA ,img . getWidth () , img . getHeight () , 0, img . getGLFormat () ,GL2 . GL_UNSIGNED_BYTE , bb );97