llvmpipe: fix flatshading in new line code
Calculate interpolants before rearranging the vertices.
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@ -292,6 +292,7 @@ try_setup_line( struct lp_setup_context *setup,
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float x2diff;
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float y2diff;
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float dx, dy;
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float area;
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boolean draw_start;
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boolean draw_end;
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@ -311,6 +312,18 @@ try_setup_line( struct lp_setup_context *setup,
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dx = v1[0][0] - v2[0][0];
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dy = v1[0][1] - v2[0][1];
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area = (dx * dx + dy * dy);
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if (area == 0) {
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LP_COUNT(nr_culled_tris);
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return TRUE;
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}
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info.oneoverarea = 1.0f / area;
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info.dx = dx;
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info.dy = dy;
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info.v1 = v1;
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info.v2 = v2;
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/* X-MAJOR LINE */
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if (fabsf(dx) >= fabsf(dy)) {
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@ -573,12 +586,6 @@ try_setup_line( struct lp_setup_context *setup,
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line->plane[3].dcdx = y[3] - y[0];
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info.oneoverarea = 1.0f / (dx * dx + dy * dy);
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info.dx = dx;
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info.dy = dy;
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info.v1 = v1;
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info.v2 = v2;
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/* Setup parameter interpolants:
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*/
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setup_line_coefficients( setup, line, &info);
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