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TEXTUREGRAD(3G) | [FIXME: manual] | TEXTUREGRAD(3G) |
NAME¶
textureGrad - perform a texture lookup with explicit gradientsDECLARATION¶
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¶
samplerSpecifies 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 | ||||||||||||
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 © 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 Group08/26/2014 | [FIXME: source] |