As a concrete example, the current nv40 code does this during fragment
program translation.
case TGSI_SEMANTIC_GENERIC:
if (fdec->Semantic.Index <= 7) {
hw = NV40_FP_OP_INPUT_SRC_TC(fdec->Semantic.
Index);
} else {
NOUVEAU_ERR("bad generic semantic index\n");
return FALSE;
}
break;
As a result, GLSL completely fails to work on nv30 and nv40.
nv50 instead seems to have hardware routing support, which is used by
the driver.
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