87    span->attrStepX[VARYING_SLOT_POS][3] = 0.0;  in _swrast_span_default_attribs()
113    ASSIGN_4V(span->attrStepX[VARYING_SLOT_COL0], 0.0, 0.0, 0.0, 0.0);  in _swrast_span_default_attribs()
120       ASSIGN_4V(span->attrStepX[VARYING_SLOT_COL1], 0.0, 0.0, 0.0, 0.0);  in _swrast_span_default_attribs()
137       span->attrStepX[VARYING_SLOT_FOGC][0] = 0.0;  in _swrast_span_default_attribs()
161          ASSIGN_4V(span->attrStepX[attr], 0.0F, 0.0F, 0.0F, 0.0F);  in _swrast_span_default_attribs()
188          const GLfloat dwdx = span->attrStepX[VARYING_SLOT_POS][3];  in interpolate_active_attribs()
190          const GLfloat dv0dx = span->attrStepX[attr][0];  in interpolate_active_attribs()
191          const GLfloat dv1dx = span->attrStepX[attr][1];  in interpolate_active_attribs()
192          const GLfloat dv2dx = span->attrStepX[attr][2];  in interpolate_active_attribs()
193          const GLfloat dv3dx = span->attrStepX[attr][3];  in interpolate_active_attribs()
489          const GLfloat dsdx = span->attrStepX[attr][0];  in interpolate_texcoords()
491          const GLfloat dtdx = span->attrStepX[attr][1];  in interpolate_texcoords()
493          const GLfloat drdx = span->attrStepX[attr][2];  in interpolate_texcoords()
494          const GLfloat dqdx = span->attrStepX[attr][3];  in interpolate_texcoords()
531                const GLfloat dwdx = span->attrStepX[VARYING_SLOT_POS][3];  in interpolate_texcoords()
572                const GLfloat dwdx = span->attrStepX[VARYING_SLOT_POS][3];  in interpolate_texcoords()
646    dw = span->attrStepX[VARYING_SLOT_POS][3];  in interpolate_wpos()
775                   span->attrStart[i][j] += leftClip * span->attrStepX[i][j];  in clip_span()