HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 445

Chapter 18 T glTexImage3DEXT depth border format type pixels Specifies the depth of the texture image. Must be 2l + 2 × border for some integer l. Specifies the width of the border. Must be either 0 or 1. Specifies the format of the pixel data. The following symbolic values are accepted: GL_COLOR_INDEX, GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and GL_LUMINANCE_ALPHA. If the extension GL_EXT_shadow is supported, the symbolic value GL_DEPTH_COMPONENT is also accepted. Specifies the data type of the pixel data. The following symbolic values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, and GL_FLOAT. Specifies a pointer to the image data in memory. Description Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled. Three-dimensional texturing is enabled and disabled using glEnable and glDisable with argument GL_TEXTURE_3D_EXT. Texture images are defined with glTexImage3DEXT. The arguments describe the parameters of the texture image, such as height, width, depth, width of the border, level-of-detail number (see glTexParameter), and the internal resolution and format used to store the image. The last three arguments describe the way the image is represented in memory, and they are identical to the pixel formats used for glDrawPixels. If target is GL_PROXY_TEXTURE_3D_EXT no data is read from pixels, but all of the texture image state is recalculated, checked for consistency, and checked against the implementation's capabilities. If the implementation cannot handle a texture of the requested texture size, it will set all of the texture image state to 0 (GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, GL_TEXTURE_BORDER, GL_TEXTURE_COMPONENTS), but no error will be generated. If target is GL_TEXTURE_3D_EXT, data is read from pixels as a sequence of signed or unsigned bytes, shorts, or longs, or single-precision floating-point values, depending on type. These values are grouped into sets of one, two, three, or four values, depending on format, to form elements. The first element corresponds to the lower-left-rear corner of the texture volume. Subsequent elements progress left-to-right through the remaining texels in the lowest-rear row of the texture volume, then in successively higher rows of the rear 2D slice of the texture volume, then in successively closer 2D slices of the texture volume. The final element corresponds to the upper-right-front corner of the texture volume. Each element of pixels is converted to an RGBA element according to GL_COLOR_INDEX Each element is a single value, a color index. It is converted to fixed point (with an unspecified number of zero bits to the right of the binary point), shifted left or right depending on the value and sign of GL_INDEX_SHIFT, and added to GL_INDEX_OFFSET (see glPixelTransfer). The resulting index is converted to a set of 445