TEXTUREGRAD(3G)                 [FIXME: manual]                TEXTUREGRAD(3G)

NAME
       textureGrad - perform a texture lookup with explicit gradients

DECLARATION
       gvec4 textureGrad(gsampler1D sampler, float P, float dPdx, float dPdy);

       gvec4 textureGrad(gsampler2D sampler, vec2 P, vec2 dPdx, vec2 dPdy);

       gvec4 textureGrad(gsampler3D sampler, vec3 P, vec3 dPdx, vec3 dPdy);

       gvec4 textureGrad(gsamplerCube sampler, vec3 P, vec3 dPdx, vec3 dPdy);

       gvec4 textureGrad(gsampler2DRect sampler, vec2 P, vec2 dPdx,
                         vec2 dPdy);

       float textureGrad(gsampler2DRectShadow sampler, vec2 P, vec2 dPdx,
                         vec2 dPdy);

       float textureGrad(sampler1DShadow sampler, vec3 P, float dPdx,
                         float dPdy);

       float textureGrad(sampler2DShadow sampler, vec3 P, vec2 dPdx,
                         vec2 dPdy);

       gvec4 textureGrad(gsampler1DArray sampler, vec2 P, float dPdx,
                         float dPdy);

       gvec4 textureGrad(gsampler2DArray sampler, vec3 P, vec2 dPdx,
                         vec2 dPdy);

       float textureGrad(sampler1DArrayShadow sampler, vec3 P, float dPdx,
                         float dPdy);

       gvec4 textureGrad(gsamplerCubeArray sampler, vec4 P, vec3 dPdx,
                         vec3 dPdy);

PARAMETERS
       sampler
           Specifies the sampler to which the texture from which texels will
           be retrieved is bound.

       P
           Specifies the texture coordinates at which texture will be sampled.

       dPdx
           Specifies the partial derivative of P with respect to window x.

       dPdy
           Specifies the partial derivative of P with respect to window y.

DESCRIPTION
       textureGrad performs a texture lookup at coordinate P from the texture
       bound to sampler with explicit texture coordinate gradiends as
       specified in dPdx and dPdy. Set:

       <delta>s <delta>x = <delta>P <delta>x   for a 1D texture,  <delta>P.s
       <delta>x   otherwise

       <delta>s <delta>y = <delta>P <delta>y   for a 1D texture,  <delta>P.s
       <delta>y   otherwise

       <delta>t <delta>x = 0.0   for a 1D texture,  <delta>P.t <delta>x
       otherwise

       <delta>t <delta>y = 0.0   for a 1D texture,  <delta>P.t <delta>y
       otherwise

       <delta>r <delta>x = 0.0   for a 1D or 2D texture,  <delta>P.p <delta>x
       otherwise

       <delta>r <delta>y = 0.0   for a 1D or 2D texture,  <delta>P.p <delta>y
       otherwise

       For the cube version, the partial derivatives of P are assumed to be in
       the coordinate system used before texture coordinates are projected
       onto the appropriate cube face.

VERSION SUPPORT

       +-------------------------+-----------------------------------------------------------------------------------+
       |                         |                          OpenGL Shading Language Version                          |
       +-------------------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |Function Name            | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
       +-------------------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |textureGrad              |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       +-------------------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |textureGrad              |  -   |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(gsampler2DRect{Shadow}) |      |      |      |      |      |      |      |      |      |      |      |      |
       +-------------------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |textureGrad              |  -   |  -   |  -   |  -   |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(gsamplerCubeArray)      |      |      |      |      |      |      |      |      |      |      |      |      |
       +-------------------------+------+------+------+------+------+------+------+------+------+------+------+------+

SEE ALSO
       texelFetch(), texelFetchOffset(), texture(), textureGather(),
       textureGatherOffset(), textureGatherOffsets(), textureGradOffset(),
       textureLod(), textureLodOffset(), textureOffset(), textureProj(),
       textureProjGrad(), textureProjGradOffset(), textureProjLod(),
       textureProjLodOffset(), textureProjOffset(), textureQueryLod(),
       textureSize()

COPYRIGHT
       Copyright (C) 2011-2014 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.  http://opencontent.org/openpub/.

COPYRIGHT
       Copyright (C) 2011-2014 Khronos Group

[FIXME: source]                   05/21/2022                   TEXTUREGRAD(3G)