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);
- gvec4 textureGrad(gsampler2D sampler, vec2 P, vec2 dPdx, vec2 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
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OpenGL Shading Language Version
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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 | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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textureGrad (gsampler2DRect{Shadow}) | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
|
textureGrad (gsamplerCubeArray) | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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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. m[blue]http://opencontent.org/openpub/m[].
COPYRIGHT
Copyright © 2011-2014 Khronos Group