glTexStorage1D(3) simultaneously specify storage for all levels of a one-dimensional texture


void glTexStorage1D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width);



Specify the target of the operation. target must be either GL_TEXTURE_1D or GL_PROXY_TEXTURE_1D.


Specify the number of texture levels.


Specifies the sized internal format to be used to store texture image data.


Specifies the width of the texture, in texels.


glTexStorage1D specifies the storage requirements for all levels of a one-dimensional texture simultaneously. Once a texture is specified with this command, the format and dimensions of all levels become immutable unless it is a proxy texture. The contents of the image may still be modified, however, its storage requirements may not change. Such a texture is referred to as an immutable-format texture.

Calling glTexStorage1D is equivalent, assuming no errors are generated, to executing the following pseudo-code:

    for (i = 0; i < levels; i++)
        glTexImage1D(target, i, internalformat, width, 0, format, type, NULL);
        width = max(1, (width / 2));

Since no texture data is actually provided, the values used in the pseudo-code for format and type are irrelevant and may be considered to be any values that are legal for the chosen internalformat enumerant. internalformat must be one of the sized internal formats given in Table 1 below, one of the sized depth-component formats GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT24, or GL_DEPTH_COMPONENT16, or one of the combined depth-stencil formats, GL_DEPTH32F_STENCIL8, or GL_DEPTH24_STENCIL8. Upon success, the value of GL_TEXTURE_IMMUTABLE_FORMAT becomes GL_TRUE. The value of GL_TEXTURE_IMMUTABLE_FORMAT may be discovered by calling glGetTexParameter() with pname set to GL_TEXTURE_IMMUTABLE_FORMAT. No further changes to the dimensions or format of the texture object may be made. Using any command that might alter the dimensions or format of the texture object (such as glTexImage1D() or another call to glTexStorage1D) will result in the generation of a GL_INVALID_OPERATION error, even if it would not, in fact, alter the dimensions or format of the object.

Table 1. Sized Internal Formats

            Sized Internal Format

            Base Internal Format

            Red Bits

            Green Bits

            Blue Bits

            Alpha Bits

            Shared Bits

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_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  


GL_INVALID_ENUM is generated if internalformat is not a valid sized internal format.

GL_INVALID_ENUM is generated if target is not GL_TEXTURE_1D or GL_TEXTURE_2D.

GL_INVALID_VALUE is generated if width or levels are less than 1.

GL_INVALID_OPERATION is generated if levels is greater than log 2 width + 1.


Copyright © 2011 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. m[blue][].