NAME

       textureProjGrad - perform a texture lookup with projection and explicit gradients

DECLARATION

       gvec4 textureProjGrad(gsampler1D sampler, vec2 P, float pDx, float pDy);

       gvec4 textureProjGrad(gsampler1D sampler, vec4 P, float pDx, float pDy);

       gvec4 textureProjGrad(gsampler2D sampler, vec3 P, vec2 pDx, vec2 pDy);

       gvec4 textureProjGrad(gsampler2D sampler, vec4 P, vec2 pDx, vec2 pDy);

       gvec4 textureProjGrad(gsampler3D sampler, vec4 P, vec3 pDx, vec3 pDy);

       float textureProjGrad(sampler1DShadow sampler, vec4 P, float pDx, float pDy);

       float textureProjGrad(sampler2DShadow sampler, vec4 P, vec2 pDx, vec2 pDy);

       gvec4 textureProjGrad(gsampler2DRect sampler, vec3 P, vec2 pDx, vec2 pDy);

       gvec4 textureProjGrad(gsampler2DRect sampler, vec4 P, vec2 pDx, vec2 pDy);

       float textureProjGrad(gsampler2DRectShadow sampler, vec4 P, vec2 pDx, vec2 pDy);

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

       textureProjGrad performs a texture lookup with projection and explicit gradients. The
       texture coordinates consumed from P, not including the last component of P, are divided by
       the last component of P. The resulting 3rd component of P in the shadow forms is used as
       Dref. After these values are computed, the texture lookup proceeds as in textureGrad(),
       passing dPdx and dPdy as gradients.

VERSION SUPPORT

       ┌─────────────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │                         │        OpenGL Shading Language Version                                            │
       ├─────────────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │Function                 │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
       │Name                     │      │      │      │      │      │      │      │      │      │      │      │      │
       ├─────────────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │textureProjGrad          │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       ├─────────────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │textureProjGrad          │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │(gsampler2DRect{Shadow}) │      │      │      │      │      │      │      │      │      │      │      │      │
       └─────────────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘

SEE ALSO

       texelFetch(), texelFetchOffset(), texture(), textureGather(), textureGatherOffset(),
       textureGatherOffsets(), textureGrad(), textureGradOffset(), textureLod(),
       textureLodOffset(), textureOffset(), textureProj(), 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]                             07/22/2015                        TEXTUREPROJGRAD(3G)