How to use MultiteXture in OpenGL. That is, how to open multiple layers.
Question: BY XheartBlue1: GLACTIVETEXTURE (GL_TEXTUREN); can control the current texture operation to which TEX_Unit can be used. The n from GL_Texturen from 0 to 31. See Glext.h definitions.
2: GLACTIVETEXTURE is an extension. But already in the core of OpenGL 1.3. So Doc to GLSPEC1.3 to find it.
3: Glmulttexcoord (GL_Texturen, ....); used to specify a Tex_Unit texture coordinate.
4: GlclientActiveTexture (GL_Texturen); Used to control the following functions affect the nth tex_unitglenableclientstate (GL_Texture_Coord_Array); GLTEXCOORDPOINTER
5: EG. Using the second texture code as the following GLACTIVETEXTURE (GL_Texture_2D); GlbindTexture (...): Gltexenv (...): Close the second texture code as the following GLACTIVETEXTURE (GL_Texture1) GLDISABLE (GL_TEXTURE_2D); GLACTIVETEXTURE (GL_Texture0); // Change back to the first. Otherwise, the following operation is for GL_Texture1.
Use two texture channels using two texture channels ïž All to activate them, 44 GlclientActiveTexture (GL_Texture0); GLENABLETATEXTATE (GL_TEXTURE_COORD_ARRAY); GLCLIENTACTIVETEXTURE (GL_Texture1); GLENABLECLIENTSTATE (GL_Texture_Coord_Array)
GlclientActiveTexture (GL_Texture0); gltexcoordpointer (); GlclientactiveTexture (GL_Texture1); gltexcoordpointer ();
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GLDRAWARRAYS (....
// After using two channels. All are closed. GlclientActiveTexture (GL_Texture0); GLDISABLECLIENTSTATE (GL_Texture_Coord_Array); GlclientActiveTexture (GL_Texture1); GLDISABLECLIENTATATE (GL_Texture_Coord_Array);
// Close the second texture channel GLACTIVETEXTEXTURE (GL_Texture1); GLDISABLE (GL_Texture_2D); GLACTIVETEXTURE (GL_Texture0); glenable (GL_Texture_2D);
6: Finally, supplement: The belt does not take ARB. Knowing the definition. ARB later turned into the core.
