Method and programmable device for triangle interpolation in homogeneous space

摘要

A method and apparatus for obtaining an attribute of a pixel in homogenous space. After obtaining the vertices of a triangle, the world space coordinates and the attribute of each vertex are transformed to coordinates and an attribute in viewer space. Then a set of homogenous coefficients of each vertex is computed based on the viewer space coordinates, and the viewer space coordinates of each vertex are projected to coordinates in screen space. Pixels in the screen space that are affected by the triangle are determined based on the screen space coordinates. For each pixel affected by the triangle, a set of barycentric coefficients in homogenous space is computed, based on the homogenous coefficients, and a linear interpolation is performed based on the set of homogenous barycentric coefficients and the attributes of the vertices in the viewer space to obtain the attribute in the homogenous space of that pixel.