Provided by: opengl-4-man-doc_1.0~svn22917-1_all 
NAME
glTexImage2D - specify a two-dimensional texture image
C SPECIFICATION
void glTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width,
GLsizei height, GLint border, GLenum format, GLenum type,
const GLvoid * data);
PARAMETERS
target
Specifies the target texture. Must be GL_TEXTURE_2D, GL_PROXY_TEXTURE_2D,
GL_TEXTURE_1D_ARRAY, GL_PROXY_TEXTURE_1D_ARRAY, GL_TEXTURE_RECTANGLE,
GL_PROXY_TEXTURE_RECTANGLE, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or GL_PROXY_TEXTURE_CUBE_MAP.
level
Specifies the level-of-detail number. Level 0 is the base image level. Level n is the
nth mipmap reduction image. If target is GL_TEXTURE_RECTANGLE or
GL_PROXY_TEXTURE_RECTANGLE, level must be 0.
internalFormat
Specifies the number of color components in the texture. Must be one of base internal
formats given in Table 1, one of the sized internal formats given in Table 2, or one
of the compressed internal formats given in Table 3, below.
width
Specifies the width of the texture image. All implementations support texture images
that are at least 1024 texels wide.
height
Specifies the height of the texture image, or the number of layers in a texture array,
in the case of the GL_TEXTURE_1D_ARRAY and GL_PROXY_TEXTURE_1D_ARRAY targets. All
implementations support 2D texture images that are at least 1024 texels high, and
texture arrays that are at least 256 layers deep.
border
This value must be 0.
format
Specifies the format of the pixel data. The following symbolic values are accepted:
GL_RED, GL_RG, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA, GL_RED_INTEGER, GL_RG_INTEGER,
GL_RGB_INTEGER, GL_BGR_INTEGER, GL_RGBA_INTEGER, GL_BGRA_INTEGER, GL_STENCIL_INDEX,
GL_DEPTH_COMPONENT, GL_DEPTH_STENCIL.
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, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5,
GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV,
GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8,
GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, and
GL_UNSIGNED_INT_2_10_10_10_REV.
data
Specifies a pointer to the image data in memory.
DESCRIPTION
Texturing allows elements of an image array to be read by shaders.
To define texture images, call glTexImage2D. The arguments describe the parameters of the
texture image, such as height, width, width of the border, level-of-detail number (see
glTexParameter()), and number of color components provided. The last three arguments
describe how the image is represented in memory.
If target is GL_PROXY_TEXTURE_2D, GL_PROXY_TEXTURE_1D_ARRAY, GL_PROXY_TEXTURE_CUBE_MAP, or
GL_PROXY_TEXTURE_RECTANGLE, no data is read from data, 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 sets all of the image state to 0, but does not generate an error (see glGetError()). To
query for an entire mipmap array, use an image array level greater than or equal to 1.
If target is GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE or one of the GL_TEXTURE_CUBE_MAP
targets, data is read from data 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. Each data byte is treated as eight 1-bit elements, with bit ordering determined
by GL_UNPACK_LSB_FIRST (see glPixelStore()).
If target is GL_TEXTURE_1D_ARRAY, data is interpreted as an array of one-dimensional
images.
If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER target (see
glBindBuffer()) while a texture image is specified, data is treated as a byte offset into
the buffer object's data store.
The first element corresponds to the lower left corner of the texture image. Subsequent
elements progress left-to-right through the remaining texels in the lowest row of the
texture image, and then in successively higher rows of the texture image. The final
element corresponds to the upper right corner of the texture image.
format determines the composition of each element in data. It can assume one of these
symbolic values:
GL_RED
Each element is a single red component. The GL converts it to floating point and
assembles it into an RGBA element by attaching 0 for green and blue, and 1 for alpha.
Each component is clamped to the range [0,1].
GL_RG
Each element is a red/green double. The GL converts it to floating point and assembles
it into an RGBA element by attaching 0 for blue, and 1 for alpha. Each component is
clamped to the range [0,1].
GL_RGB
GL_BGR
Each element is an RGB triple. The GL converts it to floating point and assembles it
into an RGBA element by attaching 1 for alpha. Each component is clamped to the range
[0,1].
GL_RGBA
GL_BGRA
Each element contains all four components. Each component is clamped to the range
[0,1].
GL_DEPTH_COMPONENT
Each element is a single depth value. The GL converts it to floating point and clamps
to the range [0,1].
GL_DEPTH_STENCIL
Each element is a pair of depth and stencil values. The depth component of the pair is
interpreted as in GL_DEPTH_COMPONENT. The stencil component is interpreted based on
specified the depth + stencil internal format.
If an application wants to store the texture at a certain resolution or in a certain
format, it can request the resolution and format with internalFormat. The GL will choose
an internal representation that closely approximates that requested by internalFormat, but
it may not match exactly. (The representations specified by GL_RED, GL_RG, GL_RGB, and
GL_RGBA must match exactly.)
internalFormat may be one of the base internal formats shown in Table 1, below
Table 1. Base Internal Formats
┌───────────────────┬─────────────────────────┬──────────────────────┐
│ │ │ │
│ Base │ RGBA, Depth │ Internal │
│Internal Format │ and Stencil Values │ Components │
│ │ │ │
├───────────────────┼─────────────────────────┼──────────────────────┤
│GL_DEPTH_COMPONENT │ Depth │ D │
├───────────────────┼─────────────────────────┼──────────────────────┤
│GL_DEPTH_STENCIL │ Depth, Stencil │ D, S │
├───────────────────┼─────────────────────────┼──────────────────────┤
│GL_RED │ Red │ R │
├───────────────────┼─────────────────────────┼──────────────────────┤
│GL_RG │ Red, Green │ R, G │
├───────────────────┼─────────────────────────┼──────────────────────┤
│GL_RGB │ Red, Green, Blue │ R, G, B │
├───────────────────┼─────────────────────────┼──────────────────────┤
│GL_RGBA │ Red, Green, Blue, Alpha │ R, G, B, A │
└───────────────────┴─────────────────────────┴──────────────────────┘
internalFormat may also be one of the sized internal formats shown in Table 2, below
Table 2. Sized Internal Formats
┌──────────────────┬──────────────────┬─────────────────┬───────────────────┬──────────────────┬───────────────────┬────────────────────┐
│ │ │ │ │ │ │ │
│ Sized │ Base │ Red │ Green │ Blue │ Alpha │ Shared │
│Internal │ Internal │ Bits │ Bits │ Bits │ Bits │ Bits │
│Format │ Format │ │ │ │ │ │
│ │ │ │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R8 │ GL_RED │ 8 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R8_SNORM │ GL_RED │ s8 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R16 │ GL_RED │ 16 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R16_SNORM │ GL_RED │ s16 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG8 │ GL_RG │ 8 │ 8 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG8_SNORM │ GL_RG │ s8 │ s8 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG16 │ GL_RG │ 16 │ 16 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG16_SNORM │ GL_RG │ s16 │ s16 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R3_G3_B2 │ GL_RGB │ 3 │ 3 │ 2 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB4 │ GL_RGB │ 4 │ 4 │ 4 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB5 │ GL_RGB │ 5 │ 5 │ 5 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB8 │ GL_RGB │ 8 │ 8 │ 8 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB8_SNORM │ GL_RGB │ s8 │ s8 │ s8 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB10 │ GL_RGB │ 10 │ 10 │ 10 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB12 │ GL_RGB │ 12 │ 12 │ 12 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB16_SNORM │ GL_RGB │ 16 │ 16 │ 16 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA2 │ GL_RGB │ 2 │ 2 │ 2 │ 2 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA4 │ GL_RGB │ 4 │ 4 │ 4 │ 4 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB5_A1 │ GL_RGBA │ 5 │ 5 │ 5 │ 1 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA8 │ GL_RGBA │ 8 │ 8 │ 8 │ 8 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA8_SNORM │ GL_RGBA │ s8 │ s8 │ s8 │ s8 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB10_A2 │ GL_RGBA │ 10 │ 10 │ 10 │ 2 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB10_A2UI │ GL_RGBA │ ui10 │ ui10 │ ui10 │ ui2 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA12 │ GL_RGBA │ 12 │ 12 │ 12 │ 12 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA16 │ GL_RGBA │ 16 │ 16 │ 16 │ 16 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_SRGB8 │ GL_RGB │ 8 │ 8 │ 8 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_SRGB8_ALPHA8 │ GL_RGBA │ 8 │ 8 │ 8 │ 8 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R16F │ GL_RED │ f16 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG16F │ GL_RG │ f16 │ f16 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB16F │ GL_RGB │ f16 │ f16 │ f16 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA16F │ GL_RGBA │ f16 │ f16 │ f16 │ f16 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R32F │ GL_RED │ f32 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG32F │ GL_RG │ f32 │ f32 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB32F │ GL_RGB │ f32 │ f32 │ f32 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA32F │ GL_RGBA │ f32 │ f32 │ f32 │ f32 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R11F_G11F_B10F │ GL_RGB │ f11 │ f11 │ f10 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB9_E5 │ GL_RGB │ 9 │ 9 │ 9 │ │ 5 │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R8I │ GL_RED │ i8 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R8UI │ GL_RED │ ui8 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R16I │ GL_RED │ i16 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R16UI │ GL_RED │ ui16 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R32I │ GL_RED │ i32 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_R32UI │ GL_RED │ ui32 │ │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG8I │ GL_RG │ i8 │ i8 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG8UI │ GL_RG │ ui8 │ ui8 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG16I │ GL_RG │ i16 │ i16 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG16UI │ GL_RG │ ui16 │ ui16 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG32I │ GL_RG │ i32 │ i32 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RG32UI │ GL_RG │ ui32 │ ui32 │ │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB8I │ GL_RGB │ i8 │ i8 │ i8 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB8UI │ GL_RGB │ ui8 │ ui8 │ ui8 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB16I │ GL_RGB │ i16 │ i16 │ i16 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB16UI │ GL_RGB │ ui16 │ ui16 │ ui16 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB32I │ GL_RGB │ i32 │ i32 │ i32 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGB32UI │ GL_RGB │ ui32 │ ui32 │ ui32 │ │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA8I │ GL_RGBA │ i8 │ i8 │ i8 │ i8 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA8UI │ GL_RGBA │ ui8 │ ui8 │ ui8 │ ui8 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA16I │ GL_RGBA │ i16 │ i16 │ i16 │ i16 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA16UI │ GL_RGBA │ ui16 │ ui16 │ ui16 │ ui16 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA32I │ GL_RGBA │ i32 │ i32 │ i32 │ i32 │ │
├──────────────────┼──────────────────┼─────────────────┼───────────────────┼──────────────────┼───────────────────┼────────────────────┤
│GL_RGBA32UI │ GL_RGBA │ ui32 │ ui32 │ ui32 │ ui32 │ │
└──────────────────┴──────────────────┴─────────────────┴───────────────────┴──────────────────┴───────────────────┴────────────────────┘
Finally, internalFormat may also be one of the generic or compressed compressed texture
formats shown in Table 3 below
Table 3. Compressed Internal Formats
┌──────────────────────────────────────┬──────────────────┬──────────────────┐
│ │ │ │
│ Compressed │ Base │ Type │
│Internal Format │ Internal Format │ │
│ │ │ │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RED │ GL_RED │ Generic │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RG │ GL_RG │ Generic │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RGB │ GL_RGB │ Generic │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RGBA │ GL_RGBA │ Generic │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_SRGB │ GL_RGB │ Generic │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_SRGB_ALPHA │ GL_RGBA │ Generic │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RED_RGTC1 │ GL_RED │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_SIGNED_RED_RGTC1 │ GL_RED │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RG_RGTC2 │ GL_RG │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_SIGNED_RG_RGTC2 │ GL_RG │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RGBA_BPTC_UNORM │ GL_RGBA │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM │ GL_RGBA │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT │ GL_RGB │ Specific │
├──────────────────────────────────────┼──────────────────┼──────────────────┤
│GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT │ GL_RGB │ Specific │
└──────────────────────────────────────┴──────────────────┴──────────────────┘
If the internalFormat parameter is one of the generic compressed formats,
GL_COMPRESSED_RED, GL_COMPRESSED_RG, GL_COMPRESSED_RGB, or GL_COMPRESSED_RGBA, the GL will
replace the internal format with the symbolic constant for a specific internal format and
compress the texture before storage. If no corresponding internal format is available, or
the GL can not compress that image for any reason, the internal format is instead replaced
with a corresponding base internal format.
If the internalFormat parameter is GL_SRGB, GL_SRGB8, GL_SRGB_ALPHA, or GL_SRGB8_ALPHA8,
the texture is treated as if the red, green, or blue components are encoded in the sRGB
color space. Any alpha component is left unchanged. The conversion from the sRGB encoded
component c s to a linear component c l is:
c l = { c s 12.92 if c s ≤ 0.04045 ( c s + 0.055 1.055 ) 2.4 if c s > 0.04045
Assume c s is the sRGB component in the range [0,1].
Use the GL_PROXY_TEXTURE_2D, GL_PROXY_TEXTURE_1D_ARRAY, GL_PROXY_TEXTURE_RECTANGLE, or
GL_PROXY_TEXTURE_CUBE_MAP target to try out a resolution and format. The implementation
will update and recompute its best match for the requested storage resolution and format.
To then query this state, call glGetTexLevelParameter(). If the texture cannot be
accommodated, texture state is set to 0.
A one-component texture image uses only the red component of the RGBA color extracted from
data. A two-component image uses the R and G values. A three-component image uses the R,
G, and B values. A four-component image uses all of the RGBA components.
Image-based shadowing can be enabled by comparing texture r coordinates to depth texture
values to generate a boolean result. See glTexParameter() for details on texture
comparison.
NOTES
The glPixelStore() mode affects texture images.
data may be a null pointer. In this case, texture memory is allocated to accommodate a
texture of width width and height height. You can then download subtextures to initialize
this texture memory. The image is undefined if the user tries to apply an uninitialized
portion of the texture image to a primitive.
glTexImage2D specifies the two-dimensional texture for the current texture unit, specified
with glActiveTexture().
GL_STENCIL_INDEX may be used for format only if the GL version is 4.4 or higher.
ERRORS
GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D, GL_TEXTURE_1D_ARRAY,
GL_TEXTURE_RECTANGLE, GL_PROXY_TEXTURE_2D, GL_PROXY_TEXTURE_1D_ARRAY,
GL_PROXY_TEXTURE_RECTANGLE, GL_PROXY_TEXTURE_CUBE_MAP, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.
GL_INVALID_ENUM is generated if target is one of the six cube map 2D image targets and the
width and height parameters are not equal.
GL_INVALID_ENUM is generated if type is not a type constant.
GL_INVALID_VALUE is generated if width is less than 0 or greater than GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if target is not GL_TEXTURE_1D_ARRAY or
GL_PROXY_TEXTURE_1D_ARRAY and height is less than 0 or greater than GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if target is GL_TEXTURE_1D_ARRAY or
GL_PROXY_TEXTURE_1D_ARRAY and height is less than 0 or greater than
GL_MAX_ARRAY_TEXTURE_LAYERS.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level is greater than log 2 max, where max is the
returned value of GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if internalFormat is not one of the accepted resolution and
format symbolic constants.
GL_INVALID_VALUE is generated if width or height is less than 0 or greater than
GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if border is not 0.
GL_INVALID_OPERATION is generated if type is one of GL_UNSIGNED_BYTE_3_3_2,
GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, or
GL_UNSIGNED_INT_10F_11F_11F_REV, and format is not GL_RGB.
GL_INVALID_OPERATION is generated if type is one of GL_UNSIGNED_SHORT_4_4_4_4,
GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV,
GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2,
GL_UNSIGNED_INT_2_10_10_10_REV, or GL_UNSIGNED_INT_5_9_9_9_REV, and format is neither
GL_RGBA nor GL_BGRA.
GL_INVALID_OPERATION is generated if target is not GL_TEXTURE_2D, GL_PROXY_TEXTURE_2D,
GL_TEXTURE_RECTANGLE, or GL_PROXY_TEXTURE_RECTANGLE, and internalFormat is
GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, or GL_DEPTH_COMPONENT32F.
GL_INVALID_OPERATION is generated if format is GL_DEPTH_COMPONENT and internalFormat is
not GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, or
GL_DEPTH_COMPONENT32F.
GL_INVALID_OPERATION is generated if internalFormat is GL_DEPTH_COMPONENT,
GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, or GL_DEPTH_COMPONENT32F, and format is not
GL_DEPTH_COMPONENT.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
GL_PIXEL_UNPACK_BUFFER target and the buffer object's data store is currently mapped.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
GL_PIXEL_UNPACK_BUFFER target and the data would be unpacked from the buffer object such
that the memory reads required would exceed the data store size.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the
GL_PIXEL_UNPACK_BUFFER target and data is not evenly divisible into the number of bytes
needed to store in memory a datum indicated by type.
GL_INVALID_VALUE is generated if target is GL_TEXTURE_RECTANGLE or
GL_PROXY_TEXTURE_RECTANGLE and level is not 0.
ASSOCIATED GETS
glGetTexImage()
glGet() with argument GL_PIXEL_UNPACK_BUFFER_BINDING
SEE ALSO
glActiveTexture(), glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(),
glCopyTexSubImage2D(), glCopyTexSubImage3D(), glPixelStore(), glTexImage1D(),
glTexImage3D(), glTexSubImage1D(), glTexSubImage2D(), glTexSubImage3D(), glTexParameter()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2011-2013 Khronos Group. This
document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org