HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 85

C glCopyTexSubImage3DEXT glCopyTexSubImage3DEXT glCopyTexSubImage3DEXT: copy pixels into a 3D texture sub image. C Specification void glCopyTexSubImage3DEXT( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height) Parameters target level xoffset yoffset zoffset x y width height The target texture. Must be GL_TEXTURE_3D_EXT. The level-of-detail number. Level 0 is the base image level, and level n is the nth mipmap reduction image. Texel offset in the X direction within the texture array. Texel offset in the Y direction within the texture array. Texel offset in the Z direction within the texture array. The X coordinate of the lower-left corner of the pixel rectangle to be transferred to the texture array. The Y coordinate of the lower-left corner of the pixel rectangle to be transferred to the texture array. The width of the texture sub image. The height of the texture sub image. Description glCopyTexSubImage3DEXT replaces a rectangular portion of a three-dimensional texture image with pixels from the current GL_READ_BUFFER (rather than from main memory, as is the case for glTexSubImage3DEXT). The screen-aligned pixel rectangle with lower-left corner at (x, y) having width width and height height replaces the rectangular area of the S-T slice located at zoffset with X indices xoffset through xoffset + width - 1, inclusive, and Y indices yoffset through yoffset + height - 1, inclusive. The destination rectangle in the texture array may not include any texels outside the texture array as it was originally specified. It is not an error to specify a subtexture with zero width or height, but such a specification has no effect. Chapter 3 85