The mode the texture uses to compute its output fragment color. See GLKTextureEnvMode.
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@property(nonatomic, assign) GLKTextureEnvMode envMode;
The default value is GLKTextureEnvModeModulate.
A Boolean value that indicates whether this texture is used to texture drawn primitives.
The OpenGL name for the texture being sampled by this texture stage.
The kind of texture pointed to by the texture stage. See GLKTextureTarget.