+ else {
+ const int dims = texture_dims(bld->static_state->target);
+ struct lp_build_context *float_bld = &bld->float_bld;
+ LLVMValueRef lod_bias = LLVMConstReal(LLVMFloatType(),
+ bld->static_state->lod_bias);
+ LLVMValueRef min_lod = LLVMConstReal(LLVMFloatType(),
+ bld->static_state->min_lod);
+ LLVMValueRef max_lod = LLVMConstReal(LLVMFloatType(),
+ bld->static_state->max_lod);
+
+ LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
+ LLVMValueRef index1 = LLVMConstInt(LLVMInt32Type(), 1, 0);
+ LLVMValueRef index2 = LLVMConstInt(LLVMInt32Type(), 2, 0);
+
+ LLVMValueRef s0, s1, s2;
+ LLVMValueRef t0, t1, t2;
+ LLVMValueRef r0, r1, r2;
+ LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy;
+ LLVMValueRef rho, lod;
+
+ /*
+ * dsdx = abs(s[1] - s[0]);
+ * dsdy = abs(s[2] - s[0]);
+ * dtdx = abs(t[1] - t[0]);
+ * dtdy = abs(t[2] - t[0]);
+ * drdx = abs(r[1] - r[0]);
+ * drdy = abs(r[2] - r[0]);
+ * XXX we're assuming a four-element quad in 2x2 layout here.
+ */
+ s0 = LLVMBuildExtractElement(bld->builder, s, index0, "s0");
+ s1 = LLVMBuildExtractElement(bld->builder, s, index1, "s1");
+ s2 = LLVMBuildExtractElement(bld->builder, s, index2, "s2");
+ dsdx = LLVMBuildSub(bld->builder, s1, s0, "");
+ dsdx = lp_build_abs(float_bld, dsdx);
+ dsdy = LLVMBuildSub(bld->builder, s2, s0, "");
+ dsdy = lp_build_abs(float_bld, dsdy);
+ if (dims > 1) {
+ t0 = LLVMBuildExtractElement(bld->builder, t, index0, "t0");
+ t1 = LLVMBuildExtractElement(bld->builder, t, index1, "t1");
+ t2 = LLVMBuildExtractElement(bld->builder, t, index2, "t2");
+ dtdx = LLVMBuildSub(bld->builder, t1, t0, "");
+ dtdx = lp_build_abs(float_bld, dtdx);
+ dtdy = LLVMBuildSub(bld->builder, t2, t0, "");
+ dtdy = lp_build_abs(float_bld, dtdy);
+ if (dims > 2) {
+ r0 = LLVMBuildExtractElement(bld->builder, r, index0, "r0");
+ r1 = LLVMBuildExtractElement(bld->builder, r, index1, "r1");
+ r2 = LLVMBuildExtractElement(bld->builder, r, index2, "r2");
+ drdx = LLVMBuildSub(bld->builder, r1, r0, "");
+ drdx = lp_build_abs(float_bld, drdx);
+ drdy = LLVMBuildSub(bld->builder, r2, r0, "");
+ drdy = lp_build_abs(float_bld, drdy);
+ }
+ }