glGenerateMipmap — generate mipmaps for a specified texture target
| ||GLenum target |
Specifies the target to which the texture whose mimaps to generate is bound.
target must be
glGenerateMipmap generates mipmaps for the texture attached to
target of the active texture unit. For cube map textures, a
GL_INVALID_OPERATION error is generated if the texture attached to
target is not cube complete.
Mipmap generation replaces texel array levels through with arrays derived from the array, regardless of their previous contents. All other mimap arrays, including the array, are left unchanged by this computation.
The internal formats of the derived mipmap arrays all match those of the array. The contents of the derived arrays are computed by repeated, filtered reduction of the array. For two-dimensional texture arrays, each layer is filtered independently.
GL_INVALID_ENUM is generated if
target is not one of the accepted texture targets.
GL_INVALID_OPERATION is generated if
GL_TEXTURE_CUBE_MAP and the texture bound to the
GL_TEXTURE_CUBE_MAP target of the active texture unit is not cube complete.
GL_INVALID_OPERATION is generated if the array is stored in a compressed internal format.
GL_INVALID_OPERATION is generated if the array was not specified with an unsized internal format or a sized internal format that is both color-renderable and texture-filterable.
GLuint texture_id; glGenTextures(1, &texture_id); glBindTexture(GL_TEXTURE_2D, texture_id); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); // texture_data is the source data of your texture, in this case // its size is sizeof(unsigned char) * texture_width * texture_height * 4 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width, texture_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture_data); glGenerateMipmap(GL_TEXTURE_2D); // Unavailable in OpenGL 2.1, use gluBuild2DMipmaps() insteads. glBindTexture(GL_TEXTURE_2D, 0);
|OpenGL ES API Version|
Copyright © 2010-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.