clamp after offsetting, new comments
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@ -74,32 +74,34 @@ static void do_offset_tri( struct prim_stage *stage,
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/* Window coords:
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*/
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GLfloat *v0 = (GLfloat *)&(header->v[0]->data[0]);
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GLfloat *v1 = (GLfloat *)&(header->v[1]->data[0]);
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GLfloat *v2 = (GLfloat *)&(header->v[2]->data[0]);
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GLfloat *v0 = header->v[0]->data[0];
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GLfloat *v1 = header->v[1]->data[0];
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GLfloat *v2 = header->v[2]->data[0];
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/* edge vectors e = v0 - v2, f = v1 - v2 */
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GLfloat ex = v0[0] - v2[2];
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GLfloat fx = v1[0] - v2[2];
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GLfloat ey = v0[1] - v2[2];
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GLfloat fy = v1[1] - v2[2];
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GLfloat ez = v0[2] - v2[2];
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GLfloat fx = v1[0] - v2[2];
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GLfloat fy = v1[1] - v2[2];
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GLfloat fz = v1[2] - v2[2];
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/* (a,b) = cross(e,f).xy */
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GLfloat a = ey*fz - ez*fy;
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GLfloat b = ez*fx - ex*fz;
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GLfloat ac = a * inv_det;
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GLfloat bc = b * inv_det;
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GLfloat zoffset;
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GLfloat dzdx = FABSF(a * inv_det);
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GLfloat dzdy = FABSF(b * inv_det);
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ac = FABSF(ac);
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bc = FABSF(bc);
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GLfloat zoffset = offset->units + MAX2(dzdx, dzdy) * offset->scale;
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zoffset = offset->units + MAX2( ac, bc ) * offset->scale;
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v0[2] += zoffset;
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v1[2] += zoffset;
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v2[2] += zoffset;
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/*
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* Note: we're applying the offset and clamping per-vertex.
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* Ideally, the offset is applied per-fragment prior to fragment shading.
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*/
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v0[2] = CLAMP(v0[2] + zoffset, 0.0, 1.0);
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v1[2] = CLAMP(v1[2] + zoffset, 0.0, 1.0);
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v2[2] = CLAMP(v2[2] + zoffset, 0.0, 1.0);
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stage->next->tri( stage->next, header );
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}
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