openGL之API学习（六十七）glTexParameter glTextureParameter

设置纹理对象的参数，这两个函数其实是一个功能。

void glTexParameterf(     GLenum target,
      GLenum pname,
      GLfloat param);

target

    Specifies the target to which the texture is bound for glTexParameter functions. Must be one of GL_TEXTURE_1D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_2D_MULTISAMPLE, GL_TEXTURE_2D_MULTISAMPLE_ARRAY, GL_TEXTURE_3D, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_CUBE_MAP_ARRAY, or GL_TEXTURE_RECTANGLE.

指定当前纹理对象的目标类型

pname

    Specifies the symbolic name of a single-valued texture parameter. pname can be one of the following: GL_DEPTH_STENCIL_TEXTURE_MODE, GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_COMPARE_FUNC, GL_TEXTURE_COMPARE_MODE, GL_TEXTURE_LOD_BIAS, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MIN_LOD, GL_TEXTURE_MAX_LOD, GL_TEXTURE_MAX_LEVEL, GL_TEXTURE_SWIZZLE_R, GL_TEXTURE_SWIZZLE_G, GL_TEXTURE_SWIZZLE_B, GL_TEXTURE_SWIZZLE_A, GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, or GL_TEXTURE_WRAP_R.

    For the vector commands (glTexParameter*v), pname can also be one of GL_TEXTURE_BORDER_COLOR or GL_TEXTURE_SWIZZLE_RGBA.

指定纹理参数类型

param

    For the scalar commands, specifies the value of pname.

指定纹理参数的值

    glTexParameterf(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);