Parameters

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:

$\frac{\mathrm{\delta s}}{\mathrm{\delta x}}=\frac{\mathrm{\delta P}}{\mathrm{\delta x}}\mathrm{for\; a\; 1D\; texture,}\frac{\mathrm{\delta P.s}}{\mathrm{\delta x}}\mathrm{otherwise}$

$\frac{\mathrm{\delta s}}{\mathrm{\delta y}}=\frac{\mathrm{\delta P}}{\mathrm{\delta y}}\mathrm{for\; a\; 1D\; texture,}\frac{\mathrm{\delta P.s}}{\mathrm{\delta y}}\mathrm{otherwise}$

$\frac{\mathrm{\delta t}}{\mathrm{\delta x}}=0.0\mathrm{for\; a\; 1D\; texture,}\frac{\mathrm{\delta P.t}}{\mathrm{\delta x}}\mathrm{otherwise}$

$\frac{\mathrm{\delta t}}{\mathrm{\delta y}}=0.0\mathrm{for\; a\; 1D\; texture,}\frac{\mathrm{\delta P.t}}{\mathrm{\delta y}}\mathrm{otherwise}$

$\frac{\mathrm{\delta r}}{\mathrm{\delta x}}=0.0\mathrm{for\; a\; 1D\; or\; 2D\; texture,}\frac{\mathrm{\delta P.p}}{\mathrm{\delta x}}\mathrm{otherwise}$

$\frac{\mathrm{\delta r}}{\mathrm{\delta y}}=0.0\mathrm{for\; a\; 1D\; or\; 2D\; texture,}\frac{\mathrm{\delta P.p}}{\mathrm{\delta y}}\mathrm{otherwise}$

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

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. https://opencontent.org/openpub/.