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added INTERP_VARYING code

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Brian 2006-12-21 17:50:22 -07:00
parent eb2a6d62f9
commit 392d9701e3
1 changed files with 29 additions and 0 deletions
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29
src/mesa/swrast/s_linetemp.h
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@ -37,6 +37,7 @@
* INTERP_INDEX - if defined, interpolate color index values
* INTERP_TEX - if defined, interpolate unit 0 texcoords
* INTERP_MULTITEX - if defined, interpolate multi-texcoords
* INTERP_VARYING - if defined, interpolate GLSL varyings
*
* When one can directly address pixels in the color buffer the following
* macros can be defined and used to directly compute pixel addresses during
@ -333,6 +334,34 @@ NAME( GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1 )
}
}
#endif
#ifdef INTERP_VARYING
interpFlags |= SPAN_VARYING;
{ /* XXX review this */
const GLfloat invLen = 1.0F / numPixels;
GLuint v;
for (v = 0; v < MAX_VARYING; v++) {
const GLfloat invw0 = vert0->win[3];
const GLfloat invw1 = vert1->win[3];
GLfloat ds, dt, dr, dq;
span.var[v][0] = invw0 * vert0->varying[v][0];
span.var[v][1] = invw0 * vert0->varying[v][1];
span.var[v][2] = invw0 * vert0->varying[v][2];
span.var[v][3] = invw0 * vert0->varying[v][3];
ds = (invw1 * vert1->varying[v][0]) - span.var[v][0];
dt = (invw1 * vert1->varying[v][1]) - span.var[v][1];
dr = (invw1 * vert1->varying[v][2]) - span.var[v][2];
dq = (invw1 * vert1->varying[v][3]) - span.var[v][3];
span.varStepX[v][0] = ds * invLen;
span.varStepX[v][1] = dt * invLen;
span.varStepX[v][2] = dr * invLen;
span.varStepX[v][3] = dq * invLen;
span.varStepY[v][0] = 0.0F;
span.varStepY[v][1] = 0.0F;
span.varStepY[v][2] = 0.0F;
span.varStepY[v][3] = 0.0F;
}
}
#endif
INIT_SPAN(span, GL_LINE, numPixels, interpFlags, SPAN_XY);