TEXTUREGRAD(3G)

    .SH "NAME" textureGrad - perform a texture lookup with explicit gradients
    .SH "DECLARATION"

            .HP u gvec4 textureGrad(gsampler1D sampler, float P, float dPdx, float dPdy);
            .HP u gvec4 textureGrad(gsampler2D sampler, vec2 P, vec2 dPdx, vec2 dPdy);
            .HP u gvec4 textureGrad(gsampler3D sampler, vec3 P, vec3 dPdx, vec3 dPdy);
            .HP u gvec4 textureGrad(gsamplerCube sampler, vec3 P, vec3 dPdx, vec3 dPdy);
            .HP u gvec4 textureGrad(gsampler2DRect sampler, vec2 P, vec2 dPdx, vec2 dPdy);
            .HP u float textureGrad(sampler2DRectShadow sampler, vec3 P, vec2 dPdx, vec2 dPdy);
            .HP u float textureGrad(sampler1DShadow sampler, vec3 P, float dPdx, float dPdy);
            .HP u gvec4 textureGrad(gsampler1DArray sampler, vec2 P, float dPdx, float dPdy);
            .HP u gvec4 textureGrad(gsampler2DArray sampler, vec3 P, vec2 dPdx, vec2 dPdy);
            .HP u float textureGrad(sampler1DArrayShadow sampler, vec3 P, float dPdx, float dPdy);
            .HP u float textureGrad(sampler2DShadow sampler, vec3 P, vec2 dPdx, vec2 dPdy);
            .HP u float textureGrad(samplerCubeShadow sampler, vec4 P, vec3 dPdx, vec3 dPdy);
            .HP u float textureGrad(sampler2DArrayShadow sampler, vec4 P, vec2 dPdx, vec2 dPdy);
            .HP u gvec4 textureGrad(gsamplerCubeArray sampler, vec4 P, vec3 dPdx, vec3 dPdy);

    .SH "PARAMETERS"

        .PP sampler

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

            .RE
            .PP P

                        Specifies the texture coordinates at which texture will be sampled.

                .RE
                .PP dPdx

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

                    .RE
                    .PP dPdy

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

                        .RE

                    .SH "DESCRIPTION"
                        .PP 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:
                        .PP δs δx = δP δx for a 1D texture, δP.s δx otherwise
                        .PP δs δy = δP δy for a 1D texture, δP.s δy otherwise
                        .PP δt δx = 0.0 for a 1D texture, δP.t δx otherwise
                        .PP δt δy = 0.0 for a 1D texture, δP.t δy otherwise
                        .PP δr δx = 0.0 for a 1D or 2D texture, δP.p δx otherwise
                        .PP δr δy = 0.0 for a 1D or 2D texture, δP.p δy otherwise
                        .PP 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.

                    .SH "VERSION SUPPORT"
                        .TS allbox tab(:); lB cB s s s s s s s s s s s lB cB cB cB cB cB cB cB cB cB cB cB cB. T{ T}:T{ OpenGL Shading Language Version T} T{ Function Name T}:T{ 1.10 T}:T{ 1.20 T}:T{ 1.30 T}:T{ 1.40 T}:T{ 1.50 T}:T{ 3.30 T}:T{ 4.00 T}:T{ 4.10 T}:T{ 4.20 T}:T{ 4.30 T}:T{ 4.40 T}:T{ 4.50 T} l c c c c c c c c c c c c l c c c c c c c c c c c c l c c c c c c c c c c c c. T{ textureGrad T}:T{ - T}:T{ - T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T} T{ textureGrad (gsampler2DRect{Shadow}) T}:T{ - T}:T{ - T}:T{ - T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T} T{ textureGrad (gsamplerCubeArray) T}:T{ - T}:T{ - T}:T{ - T}:T{ - T}:T{ - T}:T{ - T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}

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

                    .SH "COPYRIGHT"
                        .PP 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. https://opencontent.org/openpub/.

COPYRIGHT
Copyright © 2011-2014 Khronos Group