glteximage4dext(3G)
glTexImage4DSGIS - specify a four-dimensional texture image
As shipped in IRIX 6.5.5. Unchanged since IRIX 6.5.
NAME glTexImage4DSGIS - specify a four-dimensional texture image C SPECIFICATION void glTexImage4DSGIS( GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLsizei size4d, GLint border, GLenum format, GLenum type, const GLvoid *pixels ) PARAMETERS target Specifies the target texture. Must be GL_TEXTURE_4D_SGIS or GL_PROXY_TEXTURE_4D_SGIS. level Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image. internalformat Specifies the internal storage format of the texture image. it must be one of the following symbolic constants: GL_ALPHA, GL_ALPHA4_EXT, GL_ALPHA8_EXT, GL_ALPHA12_EXT, GL_ALPHA16_EXT, GL_LUMINANCE, GL_LUMINANCE4_EXT, GL_LUMINANCE8_EXT, GL_LUMINANCE12_EXT, GL_LUMINANCE16_EXT, GL_LUMINANCE_ALPHA, GL_LUMINANCE4_ALPHA4_EXT, GL_LUMINANCE6_ALPHA2_EXT, GL_LUMINANCE8_ALPHA8_EXT, GL_LUMINANCE12_ALPHA4_EXT, GL_LUMINANCE12_ALPHA12_EXT, GL_LUMINANCE16_ALPHA16_EXT, GL_INTENSITY_EXT, GL_INTENSITY4_EXT, GL_INTENSITY8_EXT, GL_INTENSITY12_EXT, GL_INTENSITY16_EXT, GL_RGB, GL_RGB2_EXT, GL_RGB4_EXT, GL_RGB5_EXT, GL_RGB8_EXT, GL_RGB10_EXT, GL_RGB12_EXT, GL_RGB16_EXT, GL_RGBA, GL_RGBA2_EXT, GL_RGBA4_EXT, GL_RGB5_A1_EXT, GL_RGBA8_EXT, GL_RGB10_A2_EXT, GL_RGBA12_EXT, GL_RGBA16_EXT, GL_DUAL_ALPHA4_SGIS, GL_DUAL_ALPHA8_SGIS, GL_DUAL_ALPHA12_SGIS, GL_DUAL_ALPHA16_SGIS, GL_DUAL_LUMINANCE4_SGIS, GL_DUAL_LUMINANCE8_SGIS, GL_DUAL_LUMINANCE12_SGIS, GL_DUAL_LUMINANCE16_SGIS, GL_DUAL_INTENSITY4_SGIS, GL_DUAL_INTENSITY8_SGIS, GL_DUAL_INTENSITY12_SGIS, GL_DUAL_INTENSITY16_SGIS, GL_DUAL_LUMINANCE_ALPHA4_SGIS, GL_DUAL_LUMINANCE_ALPHA8_SGIS, GL_QUAD_ALPHA4_SGIS, GL_QUAD_ALPHA8_SGIS, GL_QUAD_LUMINANCE4_SGIS, GL_QUAD_LUMINANCE8_SGIS, GL_QUAD_INTENSITY4_SGIS, or GL_QUAD_INTENSITY8_SGIS. width Specifies the width of the texture image. Must be 2**n+2*border for some integer n. height Specifies the height of the texture image. Must be 2**m+I*border for some integer m, where I is 2 when GL_INTERLACE_SGIX is disabled, and 1 otherwise. depth Specifies the depth of the texture image. Must be 2**l+2*border for some integer l. size4d Specifies the extent (4th dimension size) of the texture image. Must be 2**k+2*border for some integer l. border Specifies the width of the border. Must be either 0 or 1. format Specifies the format of the pixel data. The following symbolic values are accepted: GL_COLOR_INDEX, GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_RGBA, GL_ABGR_EXT, GL_LUMINANCE, and GL_LUMINANCE_ALPHA. type Specifies the data type of the pixel data. The following symbolic values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2_EXT, GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT, GL_UNSIGNED_INT_8_8_8_8_EXT, and GL_UNSIGNED_INT_10_10_10_2_EXT. pixels Specifies a pointer to the image data in memory. DESCRIPTION Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled. Four-dimensional texturing is enabled and disabled using glEnable and glDisable with argument GL_TEXTURE_4D_SGIS. Texture images are defined with glTexImage4DSGIS. The arguments describe the parameters of the texture image, such as height, width, depth, extent (the 4th dimension size), width of the border, level-of-detail number (see glTexParameter), and the internal resolution and format used to store the image. The last four arguments describe the way the image is represented in memory, and they are identical to the pixel formats used for glDrawPixels. If target is GL_PROXY_TEXTURE_4D_SGIS no data is read from pixels, but all of the texture image state is recalculated, checked for consistency, and checked against the implementation's capabilities. If the implementation cannot handle a texture of the requested texture size, it will set all of the texture image state to 0 (GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, GL_TEXTURE_BORDER, GL_TEXTURE_COMPONENTS, GL_TEXTURE_RED_SIZE_EXT, GL_TEXTURE_GREEN_SIZE_EXT, GL_TEXTURE_BLUE_SIZE_EXT, GL_TEXTURE_ALPHA_SIZE_EXT, GL_TEXTURE_LUMINANCE_SIZE_EXT, and GL_TEXTURE_INTENSITY_SIZE_EXT), but no error will be generated. If target is GL_TEXTURE_4D_SGIS, data is read from pixels as a sequence of signed or unsigned bytes, shorts, or longs, or single-precision floating-point values, depending on type. These values are grouped into sets of one, two, three, or four values, depending on format, to form elements. (Note that if type is set to GL_UNSIGNED_BYTE_3_3_2_EXT, GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT, GL_UNSIGNED_INT_8_8_8_8_EXT, or GL_UNSIGNED_INT_10_10_10_2_EXT then it is a special case in which all the elements of each group are packed into a single unsigned byte, unsigned short, or unsigned int. This is described in glDrawPixels.) Four-dimensional images consist of multiple (perhaps 1) 3D volumes of image data into a "hypervolume". The size in the 4th dimension can be called the "extent" of the hypervolume. Analogous to 3D volumes whose depth ranges from "rear" to "front", the extent of a hypervolume can be said to range from "near" to "far". With this in mind, the first element corresponds to the lower-left-rear- near corner of the texture hypervolume. Subsequent elements progress left-to-right through the remaining texels in the lowest-rear-near row of the texture hypervolume, then in successively higher rows of the rear- near 2D slice of the texture hypervolume, then in successively frontal 2D slices and farther 3D volumes of the texture hypervolume. The final element corresponds to the upper-right-front-far corner of the texture hypervolume. When GL_INTERLACE_SGIX is enabled, only rows (0,2,4,...) of each S-T slice (where the border is considered part of the slice) are defined. Rows (1,3,5,...) are left undefined and can only be defined using glTexSubImage4DSGIS. Note, that when GL_INTERLACE_SGIX is enabled the total height (i.e., the height of interior texture image plus twice the border) of the defined texture is 2*height. Each element of pixels is converted to an RGBA element according to format, as detailed below. Except for GL_COLOR_INDEX, after the conversion to RGBA, each component is multiplied by the signed scale factor GL_c_SCALE, added to the signed bias GL_c_BIAS, and clamped to the range [0,1], where c is RED, GREEN, BLUE, or ALPHA, respectively (see glPixelTransfer). According to format, the conversion to RGBA is as follows: GL_COLOR_INDEX Each element is a single value, a color index. It is converted to fixed point (with an unspecified number of zero bits to the right of the binary point), shifted left or right depending on the value and sign of GL_INDEX_SHIFT, and added to GL_INDEX_OFFSET (see glPixelTransfer). The resulting index is converted to a set of color components using the GL_PIXEL_MAP_I_TO_R, GL_PIXEL_MAP_I_TO_G, GL_PIXEL_MAP_I_TO_B, and GL_PIXEL_MAP_I_TO_A tables, and clamped to the range [0,1]. GL_RED Each element is a single red component. It is converted to floating point and assembled into an RGBA element by attaching 0.0 for green and blue, and 1.0 for alpha. GL_GREEN Each element is a single green component. It is converted to floating point and assembled into an RGBA element by attaching 0.0 for red and blue, and 1.0 for alpha. GL_BLUE Each element is a single blue component. It is converted to floating point and assembled into an RGBA element by attaching 0.0 for red and green, and 1.0 for alpha. GL_ALPHA Each element is a single alpha component. It is converted to floating point and assembled into an RGBA element by attaching 0.0 for red, green, and blue. GL_RGB Each element is an RGB triple. It is converted to floating point and assembled into an RGBA element by attaching 1.0 for alpha. (see glPixelTransfer). GL_RGBA, GL_ABGR_EXT Each element contains all four components; for GL_RGBA, the red component is first, followed by green, then blue, and then alpha; for GL_ABGR_EXT the order is alpha, blue, green, and then red. GL_LUMINANCE Each element is a single luminance value. It is converted to floating point, then assembled into an RGBA element by replicating the luminance value three times for red, green, and blue and attaching 1.0 for alpha. GL_LUMINANCE_ALPHA Each element is a luminance/alpha pair. It is converted to floating point, then assembled into an RGBA element by replicating the luminance value three times for red, green, and blue. Please refer to the glDrawPixels reference page for a description of the acceptable values for the type parameter. An application may desire that the texture be stored at a certain resolution, or that it be stored in a certain format. This resolution and format can be requested by internalformat, but the implementation may not support that resolution (The formats of GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_RGB, and GL_RGBA must be supported.) When a resolution and storage format is specified, the implementation will update the texture state to provide the best match to the requested resolution. The GL_PROXY_TEXTURE_4D_SGIS target can be used to try a resolution and format. The implementation will compute its best match for the requested storage resolution and format; this state can then be queried using glGetTexLevelParameter. A one-component texture image uses only the red component of the RGBA color extracted from pixels. A two-component image uses the R and A values. A three-component image uses the R, G, and B values. A four- component image uses all of the RGBA components. The mapping of components from the canonical RGBA to the internal storage formats that begin with GL_DUAL_ and GL_QUAD_ needs to be clarified. There are three cases. The first case is for the GL_DUAL_ formats that are groups of GL_ALPHA, GL_LUMINANCE, and GL_INTENSITY. The R value goes to the first group while the A value goes to the second group. The second case is for the GL_DUAL_ formats that are groups of GL_LUMINANCE_ALPHA. The R and G values go to the first group while the B and A values go to the second group. The third case is for the GL_QUAD_ formats. The R value goes to the first group, the G value to the second group, the B value to the third group, and the A value to the fourth group. NOTES Texturing has no effect in color index mode. The texture image can be represented by the same data formats and types as the pixels in a glDrawPixels command, except that formats GL_STENCIL_INDEX and GL_DEPTH_COMPONENT cannot be used, and type GL_BITMAP cannot be used. glPixelStore and glPixelTransfer modes affect texture images in exactly the way they affect glDrawPixels. A texture image with zero height, width, depth, or extent indicates the null texture. If the null texture is specified for level-of-detail 0, it is as if texturing were disabled. glTexImage4DSGIS is part of the EXT_texture3d extension. If type is set to GL_UNSIGNED_BYTE_3_3_2_EXT, GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT, GL_UNSIGNED_INT_8_8_8_8_EXT, or GL_UNSIGNED_INT_10_10_10_2_EXT and the EXT_packed_pixels extension is not supported then a GL_INVALID_ENUM error is generated. See glIntro for more information on using extensions. ERRORS GL_INVALID_ENUM is generated when target is not an accepted value. GL_INVALID_ENUM is generated when format is not an accepted value. GL_INVALID_ENUM is generated when type is not an accepted value. GL_INVALID_VALUE is generated if level is less than zero or greater than log (max), where max is the returned value of 2 GL_MAX_4D_TEXTURE_SIZE_SGIS. GL_INVALID_VALUE is generated if internalformat is not an accepted value. GL_INVALID_VALUE is generated if width, height, depth, or size4d is less than zero or greater than GL_MAX_4D_TEXTURE_SIZE_SGIS, when width, depth, or size4d cannot be represented as 2**k+2*border for some integer k, or when height cannot be represented as 2**k+I*border, where I is 2 when GL_INTERLACE_SGIX is disabled and 1 otherwise. GL_INVALID_VALUE is generated if border is not 0 or 1. GL_INVALID_OPERATION is generated if glTexImage4DSGIS is executed between the execution of glBegin and the corresponding execution of glEnd. GL_INVALID_VALUE is generated if the implementation cannot accomodate a texture of the size requested. ASSOCIATED GETS glGetTexImage glIsEnabled with argument GL_TEXTURE_4D_SGIS glGetTexLevelParameter with a first argument of GL_PROXY_TEXTURE_4D_SGIS and a third argument of GL_TEXTURE_RED_SIZE_EXT, GL_TEXTURE_GREEN_SIZE_EXT, GL_TEXTURE_BLUE_SIZE_EXT, GL_TEXTURE_ALPHA_SIZE_EXT, GL_TEXTURE_LUMINANCE_SIZE_EXT, GL_TEXTURE_INTENSITY_SIZE_EXT, GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, GL_TEXTURE_DEPTH_EXT, GL_TEXTURE_BORDER, or GL_TEXTURE_COMPONENTS. MACHINE DEPENDENCIES The EXT_packed_pixels extension is not supported on RealityEngine, RealityEngine2, and VTX systems. On High Impact and Maximum Impact systems the number of bits per component, represented internally, is the same for all components and will be 4, 8, or 12 bits per component. All specified internal formats will receive an equal or greater representation in this scheme, up to the 12-bit limit. High Impact and Maximum Impact on Indigo2 systems do not support texture internal formats of the type GL_INTENSITY or GL_ALPHA, although High Impact and Maximum Impact on Octane systems do support these types. High Impact and Maximum Impact on Indigo2 systems without the TRAM option card support 4 bits per component for GL_RGB and GL_RGBA, 4/8 bits per component for GL_LUMINANCE_ALPHA, and 4/8/12 bits per component for GL_LUMINANCE. 4D texture mapping is supported only on High Impact and Maximum Impact systems, but only for the SGIX_pixel_texture extension (see glPixelTexGenSGIX). Standard texture-mapping of triangles and other primitives is not supported. SEE ALSO glDrawPixels, glFog, glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D, glTexImage2D, glTexParameter,