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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:

       δs δx = δP δx   for a 1D texture,  δP.s δx   otherwise

       δs δy = δP δy   for a 1D texture,  δP.s δy   otherwise

       δt δx = 0.0   for a 1D texture,  δP.t δx otherwise

       δt δy = 0.0   for a 1D texture,  δP.t δy   otherwise

       δr δx = 0.0   for a 1D or 2D texture,  δP.p δx   otherwise

       δr δy = 0.0   for a 1D or 2D texture,  δP.p δy   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                                            │
       ├─────────────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │Function1.101.201.301.401.503.304.004.104.204.304.404.50 │
       │Name                     │      │      │      │      │      │      │      │      │      │      │      │      │
       ├─────────────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │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 © 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 © 2011-2014 Khronos Group

[FIXME: source]                             01/03/2018                            TEXTUREGRAD(3G)