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GLTEXSUBIMAGE1D() GLTEXSUBIMAGE1D() NAME glTexSubImage1D - specify a two-dimensional texture subimage C SPECIFICATION void glTexSubImage1D( GLenum target, GLint level, GLint xoffset, GLsizei width, GLenum format, GLenum type, const GLvoid *pixels ) delim $$ PARAMETERS target Specifies the target texture. Must be GL_TEXTURE_1D. level Specifies the level-of-detail number. Level 0 is the base im- age level. Level n is the nth mipmap reduction image. xoffset Specifies a texel offset in the x direction within the texture array. width Specifies the width of the texture subimage. format Specifies the format of the pixel data. The following sym- bolic values are accepted: GL_COLOR_INDEX, GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and GL_LUMI- NANCE_ALPHA. type Specifies the data type of the pixel data. The following sym- bolic values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, and GL_FLOAT. pixels Specifies a pointer to the image data in memory. DESCRIPTION Texturing maps a portion of a specified texture image onto each graphi- cal primitive for which texturing is enabled. To enable or disable one-dimensional texturing, call glEnable and glDisable with argument GL_TEXTURE_1D. glTexSubImage1D redefines a contiguous subregion of an existing one-di- mensional texture image. The texels referenced by pixels replace the portion of the existing texture array with x indices xoffset and $"xoffset"~+~"width"~-~1$, inclusive. This region may not include any texels outside the range of the texture array as it was originally specified. It is not an error to specify a subtexture with width of 0, but such a specification has no effect. NOTES glTexSubImage1D is available only if the GL version is 1.1 or greater. Texturing has no effect in color index mode. glPixelStore and glPixelTransfer modes affect texture images in exactly the way they affect glDrawPixels. ERRORS GL_INVALID_ENUM is generated if target is not one of the allowable val- ues. GL_INVALID_OPERATION is generated if the texture array has not been de- fined by a previous glTexImage1D operation. GL_INVALID_VALUE is generated if level is less than 0. GL_INVALID_VALUE may be generated if level is greater than $log sub 2$max, where max is the returned value of GL_MAX_TEXTURE_SIZE. GL_INVALID_VALUE is generated if $"xoffset" ~<~ ~-b$, or if $("xoff- set"~+~"width") ~>~ (w ~-~ b)$. Where $w$ is the GL_TEXTURE_WIDTH, and $b$ is the width of the GL_TEXTURE_BORDER of the texture image being modified. Note that $w$ includes twice the border width. GL_INVALID_VALUE is generated if width is less than 0. GL_INVALID_ENUM is generated if format is not an accepted format con- stant. GL_INVALID_ENUM is generated if type is not a type constant. GL_INVALID_ENUM is generated if type is GL_BITMAP and format is not GL_COLOR_INDEX. GL_INVALID_OPERATION is generated if glTexSubImage1D is executed be- tween the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS glGetTexImage glIsEnabled with argument GL_TEXTURE_1D SEE ALSO glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTex- SubImage2D, glDrawPixels, glPixelStore, glPixelTransfer, glTexEnv, gl- TexGen, glTexImage1D, glTexImage2D, glTexParameter, glTexSubImage2D GLTEXSUBIMAGE1D()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | NOTES | ERRORS | ASSOCIATED GETS | SEE ALSO
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